GEOLOGICAL MAPPING AND PROVENANCE ANALYSIS: AS THE KEY TO IDENTIFY DISTRIBUTION OF MUD DIAPIR AND ITS IMPLICATION ON COAL RESERVES IN PT. ARUTMIN INDONESIA SITE SENAKIN

ABSTRAK Identifikasi keberadaan diapir merupakan hal esensial dalam pertambangan batubara mengingat sifatnya yang seperti intrusi dapat mengurangi cadangan batubara. Seperti yang teramati pada area pertambangan PT Arutmin Indonesia. Kehadiran mud diapir pada PIT HG telah terbukti mengurangi cadangan batubara, dengan luas area terdampak 0,7 Ha. Selain itu, beberapa diapir diperkirakan belum terpetakan karena terletak di bawah permukaan dan belum tersentuh oleh pengeboran eksplorasi PT Arutmin Indonesia, sehingga tanda-tanda permukaan seperti singkapan batuan dan struktur geologi maupun provenance diapir dapat menjadi petunjuk yang penting. Oleh sebab itu, tujuan penelitian ini adalah untuk mengetahui pola distribusi dan korelasi antara keberadaan diapir dengan struktur geologi, stratigrafi, dan provenance teridentifikasi yang kemudian dapat digunakan untuk memperkirakan persebaran diapir lainnya. Analisis dilakukan pada data primer hasil pemetaan geologi lapangan sebagai representasi struktur geologi maupun stratigrafi makro sebagai identifikator provenance. Hasil pemetaan lapangan seluas 60 km2 menunjukkan daerah penelitian terdiri dari tiga satuan batuan, yaitu satuan batupasir-batulempung termasuk lima singkapan diapir di dalamnya, satuan batulempung, dan satuan intrusi andesit. Satuan batupasir-batulempung memiliki kesetaraan dengan Formasi Tanjung yang merupakan formasi batuan sedimen tertua di daerah penelitian. Struktur geologi yang berkembang pada daerah penelitian adalah sesar geser menganan serta sesar geser mengiri yang berperan besar sebagai pengontrol keterdapatan diapir. Analisis stratigrafi menunjukkan provenance mud diapir berasal dari satuan batupasir-batulempung, Formasi Tanjung. Berdasarkan hasil analisis di atas, persebaran mud diapir berkorelasi dengan persebaran struktur geologi terutama sesar geser dan persebaran satuan batupasir-batulempung. Karena hal tersebut, maka pada area Tambang Senakin terdapat potensi keberadaan mud diapir yang tidak tersingkap di permukaan dan dapat menyebabkan hilangnya cadangan batubara termodelkan yang jauh lebih besar dari yang telah terbukti saat ini. Sebagai langkah preventif untuk mengetahui keberadaan diapir yang belum teridentifikasi, maka penulis membuat peta potensi keterdapatan diapir pada area penelitian di PT. Arutmin Indonesia Tambang Senakin. Untuk mendapatkan hasil yang lebih baik, penulis menyarankan pihak pelaksana tambang untuk melakukan analisis geolistrik pada titik yang telah direkomendasikan penulis. Kata kunci: mud diapir, Formasi Tanjung, analisis stratigrafi, pemetaan geologi lapangan, cadangan batubara ABSTRACT Identifying diapir occurrence is essential in coal mining activities knowing it behaves like an intrusion that can lead to a reduction in coal reserve. As we can observe in PT Arutmin Indonesia mining field. The presence of mud diapir on PIT HG has been proved to cut down its coal reserve, with the total area affected is 0,7 Ha. Since not all of the mud diapirs are exposed to the surface, we suspected that some of them are still yet to be found by PT Arutmin Indonesia’s exploration. Hence, diapir provenance and surface hints such as outcrop and geological structure can be a crucial indication. Therefore, this study objectives are to identify distribution and correlation between diapir occurrence and geological structures, stratigraphy, and its identified provenance that can be used to estimate other diapirs. This study began with geological mapping to identify the geological structure and its stratigraphy. Stratigraphic analysis is carried out as provenance identifier. Geological mapping in 60 km2 area concluded that the area have three lithological units, sandstone-claystone unit including five diapir outcrops, claystone unit, and andesite intrusion unit. Sandstone-claystone unit is equivalent to Tanjung Formation which is the oldest sedimentary rocks formation in the area. Dextral strike slip and sinistral strike slip faults which are found in the area considered to have a significant effect on diapirs occurrence. Further stratigraphic analysis shows that the the mud diapir’s provenance is from Tanjung Formation. Based on these analyses, we conclude that mud diapir occurrence has a good correlation to geological structures especially the strike slip faults and sandstone-claystone unit distribution. Consequently, Senakin Mine Field has a chance of losing its potential coal reserve much bigger than previously estimated due to unidentified mud diapirs occurrence below the surface. We will provide a mud diapir occurence potential map as a preventive measure in identifying unknown diapirs. We also suggest doing subsurface resistivity analysis for further detailed and better results. Keywords: mud diapir, Tanjung formation, stratigraphic analysis, geological mapping, coal reserve

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Geologi situs paleolitik das kikim, kabupaten lahat, provinsi sumatra selatan.

KALPATARU ◽

10.24832/kpt.v26i2.273 ◽

2018 ◽

Vol 26 (2) ◽

pp. 73

Author(s):

Muhammad Fadhlan Syuaib Intan

Keyword(s):

Literature Review ◽

Research Method ◽

Field Data ◽

Research Area ◽

Geological Structure ◽

Strike Slip ◽

Survey Analysis ◽

Geological Structures ◽

Geological Information ◽

Surface Geology

Lahat is one of the districts within the province of South Sumatra, the site of research, saving many cultural remains, one of them from the paleolithic period, which for so long received no attention from environmental researchers. This is the basis of the main problems that cover geology in general. Therefore, the purpose of this study is to conduct surface geology mapping in general as an effort to present geological information, while the aim is to know the geomorphological aspects, stratigraphy, geological structures associated with existence in paleolithic sites of research area. The research method begins with literature review, survey, analysis, and interpretation of field data. Environmental observations provide information about the landscape consisting of terrestrial morphology units, weak corrugated morphology units, and strong corrugated morphology units. The rivers are in the Old River, the Adult River, and Periodic /Permanent River. The constituent rocks are Gumai Formation, Benakat Air Formation, Muara Enim Formation, Kasai Formation, and alluvial. The geological structure is a strike slip fault that flows northeast-southeast. The study was conducted on the Kikim River, Lingsing River, and Pangi River, which stretches from east to west with direction from south to north. Exploration in the Kikim Basin, Lahat District has managed to find 30 paleolithic sites.Keywords: Geology, Pleistocene, Paleolithic, Open SiteABSTRAKLahat merupakan salah satu kabupaten dalam Provinsi Sumatra Selatan yang menjadi lokasi penelitian, menyimpan banyak tinggalan budaya, salah satunya dari masa paleolitik, yang sekian lama tak mendapat perhatian dari para peneliti lingkungan. Hal inilah yang dijadikan dasar permasalahan utama yang mencakup geologi secara umum. Oleh sebab itu, maksud penelitian ini dalah untuk melakukan pemetaan geologi permukaan secara umum sebagai salah satu upaya untuk menyajikan informasi geologi, sedangkan tujuannya adalah untuk mengetahui aspek-aspek geomorfologi, stratigrafi, struktur geologi yang dikaitkan dengan keberadaan di situs-situs paleolitik wilayah penelitian. Metode penelitian diawali dengan kajian pustaka, survei, analisis, dan interpretasi data lapangan. Pengamatan lingkungan memberikan informasi tentang bentang alamnya yang terdiri dari satuan morfologi dataran, satuan morfologi bergelombang lemah, dan satuan morfologi bergelombang kuat. Sungainya berstadia Sungai Tua, Sungai Dewasa-Tua, dan Sungai Periodik/Permanen. Batuan penyusun adalah Formasi Gumai, Formasi Air Benakat, Formasi Muara Enim, Formasi Kasai, dan aluvial. Struktur geologi berupa patahan geser yang berarah timur laut-tenggara. Penelitian dilaksanakan di Sungai Kikim, Sungai Lingsing, dan Sungai Pangi, yang membentang dari timur ke barat dengan arah aliran dari selatan ke utara. Eksplorasi di DAS Kikim, Kabupaten Lahat telah berhasil menemukan 30 situs paleolitik. Kata kunci: Geologi, Plistosen, Paleolitik, Situs Terbuka

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Interpretasi Struktur Geologi Berdasarkan Fault Fracture Density (FFD) dan Implikasinya Terhadap Potensi Likuefaksi di Daerah Kalibening, Kabupaten Banjarnegara, Jawa Tengah

EKSPLORIUM ◽

10.17146/eksplorium.2021.42.1.6129 ◽

2021 ◽

Vol 42 (1) ◽

pp. 47

Author(s):

Huzaely Latief Sunan ◽

Akhmad Khahlil Gibran ◽

Maulana Rizki Aditama ◽

Sachrul Iswahyudi ◽

Fajar Rizki Widiatmoko ◽

...

Keyword(s):

Bouguer Anomaly ◽

Shallow Groundwater ◽

Geological Structure ◽

Mapping Method ◽

Strike Slip ◽

Strike Slip Fault ◽

Fracture Density ◽

Geological Structures ◽

Dextral Strike Slip Fault ◽

Dextral Strike Slip

ABSTRAK Keberadaan struktur geologi sering dikaitkan dengan bencana tanah longsor dan gempa bumi. Daerah Kalibening merupakan lokasi yang cukup menarik untuk dilakukan penelitian terkait hal tersebut. Daerah ini tersusun atas satuan batuan berumur Pleistosen dan Resen. Berdasarkan stratigrafinya, batuan tersebut terpotong oleh struktur sesar. Hal ini berarti menjadikan sesar di daerah tersebut termasuk dalam kategori sesar aktif. Morfologi yang tinggi dengan suatu cekungan di tengahnya mengindikasikan bahwa daerah tersebut pembentukannya dipengaruhi oleh sesar. Penelitian ini bertujuan untuk menentukan pola struktur geologi yang mengontrol daerah penelitian. Untuk menentukan pola struktur geologi, digunakan metode pemetaan struktur Fault Fracture Density (FFD) yang dikombinasikan dengan peta residual anomali Bouguer dan peta kelurusan hillshade. Secara umum, hal yang paling penting dalam mempelajari struktur geologi adalah geometri elemen struktur. Model konseptual struktur geologi selanjutnya digunakan untuk menganalisis potensi likuefaksi yang ada pada daerah penelitian. Interpretasi struktur menunjukkan adanya sesar mendatar dekstral yang diikuti sesar-sesar penyerta dan cekungan pull-apart yang diduga merupakan hasil pensesaran normal yang timbul dari mekanisme strike-slip. Sesar mendatar dekstral ini menghasilkan cekungan yang terisi oleh sedimen lepas yang rentan mengalami likuefaksi jika terjadi gempa bumi dan gerakan tanah. Kajian ini menyimpulkan bahwa daerah Kalibening rentan terjadi likuefaksi karena adanya pergerakan sesar mendatar dekstral, sedimen lepas yang mendominasi daerah penelitian, dan muka air tanah yang dangkal. ABSTRACT The existence of geological structures is often associated with landslides and earthquakes. The Kalibening area is an interesting location for research on that purpose. This area is composed of Pleistocene and Recent rocks units. Based on its stratigraphy, the rocks in the area are truncated by fault structure. It means that the fault in the area is categorized as an active fault. The high morphology and a basin existence on its center indicate that the area formation was controlled by faults. The research is carried out to determine the trend of the geological structures that control the study area. To determine the trend of the geological structure, a structural mapping method of Fault Fracture Density (FFD) map combined with the Bouguer anomaly residual map and hillshade lineaments map is used. In general, the most important thing in the study of structural geology is the geometry of the structural elements. The conceptual model of geological structures is subsequently used to analyze the liquefaction potential of the study area. The interpretation of the structures shows the existence of dextral strike-slip fault followed by companion faults and pull-apart basin that is inferred as the result of normal faulting in the strike-slip mechanism. The dextral strike-slip fault produces a basin filled with loose sediment that is prone to liquefaction in the event of an earthquake and ground motion. This study concludes that the Kalibening area is prone to liquefaction due to the existence of the movement of dextral strike-slip fault, loose sediments that dominate the study area, and shallow groundwater table.

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KAJIAN GEOLOGI TERHADAP SITUS-SITUS DI PEKALONGAN, PROVINSI JAWA TENGAH (Geological Study On Sites In Pekalongan, Central Java Province)

Jurnal Penelitian Arkeologi Papua dan Papua Barat ◽

10.24832/papua.v11i1.262 ◽

2019 ◽

Vol 11 (1) ◽

pp. 1-18

Author(s):

Muh. Fadhlan Syuaib Intan

Keyword(s):

Research Area ◽

Geological Structure ◽

Geological Mapping ◽

Archaeological Sites ◽

Geological Structures ◽

Main Research ◽

Central Java ◽

Intermittent Rivers ◽

Geological Information ◽

Research Problems

Pekalongan the study location, present many cultural remains, one of which is from the Hindu-Buddhist period, which has not gotten any attention of environmental researchers yet. This becomes the basis of the main research problems that cover geology in general. Therefore, the purpose of this research is to carry out surface geological mapping in general as one of the efforts to present geological information, while the aim is to find out the geomorphological aspects, stratigraphy, geological structures that are associated with the existence in archaeological sites of the research area. The research method begins with literature review, surveys, analysis, and interpretation of field data. Environmental observation provides information about the landscape consisting of terrestrial morphology units, weak corrugated morphological units, and strong corrugated morphological units. The river is dendritic, radial and rectangular patterned, with the old-mature river and the old river, periodic/permanent rivers, and episodic/intermittent rivers. The rock Compositions are alluvial, andesite, basalt, volcanic breccias, and sandstones. The geological structure is in the form of faults, and is joint. The exploration in Pekalongan has found six Hindu-Buddhist sites. ABSTRAKPekalongan, yang menjadi lokasi penelitian, menyimpan banyak tinggalan budaya, salah satunya dari masa Hindu-Budha, yang belum mendapat perhatian dari para peneliti lingkungan. Hal inilah yang dijadikan dasar permasalahan utama penelitian yang mencakup geologi secara umum. Oleh sebab itu, maksud penelitian ini adalah untuk melakukan pemetaan geologi permukaan secara umum sebagai salah satu upaya untuk menyajikan informasi geologi, sedangkan tujuannya adalah untuk mengetahui aspek-aspek geomorfologi, stratigrafi, struktur geologi yang dikaitkan dengan keberadaan di situs-situs arkeologi wilayah penelitian. Metode penelitian diawali dengan kajian pustaka, survei, dan dilanjutkan dengan analisis, dan interpretasi data lapangan. Pengamatan lingkungan memberikan informasi tentang bentang alamnya terdiri yang dari satuan morfologi dataran, satuan morfologi bergelombang lemah, dan satuan morfologi bergelombang kuat. Sungainya berpola dendritik, radial, dan rektangular, berstadia sungai dewasa-tua dan sungai tua, sungai periodik/ permanen, dan sungai episodik/intermittent. Batuan penyusun adalah aluvial, andesit, basal, breksi vulkanik, dan batupasir. Struktur geologi berupa sesar, dan kekar. Eksplorasi di Kabupaten Pekalongan telah menemukan enam situs Hindu-Budha.

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Geological Structure Analysis to Determine the Direction of the Main Stress at Western Part of Kolok Mudik, Barangin District, Sawahlunto, West Sumatera

Journal of Geoscience Engineering Environment and Technology ◽

10.24273/jgeet.2017.2.1.20 ◽

2017 ◽

Vol 2 (1) ◽

pp. 46

Author(s):

Miftahul Jannah ◽

Adi Suryadi ◽

Muchtar Zafir ◽

Randi Saputra ◽

Ihsanul Hakim ◽

...

Keyword(s):

Structure Analysis ◽

Normal Fault ◽

Geological Structure ◽

Reverse Fault ◽

Geological Structures ◽

The North ◽

Main Stress

On the study area there are three types of structure, those are fault, fold and joint. Types of fault were found in the study area, reverse fault with the strike/dip is N215oE/75o, normal fault has a fault directions N22oE and N200oE with pitch 35o, and dextral fault with pitch 10o and strike N219oE. Fold and joint structures used to determine the direction of the main stress on the study area. Further, an analysis used stereonet for data folds and joints. So that from the data got three directions of main stress, those are Northeast – Southwest (T1), North – South (T2) and Southeast – Northwest (T3). On the Northeast – Southwest (T1) stress there are four geological structures, anticline fold at ST.3 , syncline folds at ST. 13a, ST. 13b, ST. 13c and ST. 33, chevron fold at ST. 44 and joint at ST. 2. On the North – South (T2) stress there are three geological structures, those are syncline fold at ST. 35, anticline fold at ST. 54 and joints at ST. 41, ST. 46 and ST. 47. On the Southeast – Northwest (T3) stress were also three geological structures, those are chevron fold at ST 42a, overturned fold at ST. 42b, syncline fold at ST. 42c and joints at ST. 5 and ST. 34.

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The theory and application of the random dislocation directional seismic wave technique in a tunnel environment

Journal of Geophysics and Engineering ◽

10.1093/jge/gxz057 ◽

2019 ◽

Vol 16 (5) ◽

pp. 939-949

Author(s):

Yonggao Yue ◽

Tao Jiang ◽

Jingye Wang ◽

Yunfeng Chao ◽

Qi Zhou ◽

...

Keyword(s):

Seismic Wave ◽

Signal To Noise Ratio ◽

Random Noise ◽

Geological Structure ◽

Detection Accuracy ◽

Detection Distance ◽

Geological Structures ◽

Multiple Wave ◽

Geological Conditions ◽

Wave Technique

Abstract Performing exact predictions of geological conditions for tunnel construction is important for ensuring safe and quick tunnel engineering. Weak effective signals and strong random noise are the main factors that affect the distance and precision of tunnel seismic detection. Considering that directional seismic wave (DSW) technology has the ability to enhance target signals and suppress random noise, we attempt to apply this method to solve the problems of low detection accuracy and short detection distance. However, the process of data processing with the DSW technique generates false multiple wave interference (FMWI), which can lead to the misinterpretation of geological structures. This study analyses the origins of FMWI and presents the random dislocation directional seismic wave (RDDSW) method to suppress this interference. The results of a numerical simulation indicate that the FMWI is effectively suppressed and that the signal-to-noise ratio of the data is increased by approximately N times through use of the N-element RDDSW technique. In the ideal case, only spherical diffusion attenuation is considered, and the detection distance increases by approximately $\scriptstyle\sqrt N $ times. In addition, this method is also effective for signals from curved events, thereby improving the precision of the analysis of the geological structure of the tunnel. Furthermore, the field data results further verify that the RDDSW technique can significantly suppress interference and thus improve the quality of the data at little cost. Hence, the RDDSW technique has great significance for accurately predicting the geological structures of tunnels and increasing the detection distance in tunnels.

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Walcot Gibson 1864-1941

Obituary Notices of Fellows of the Royal Society ◽

10.1098/rsbm.1943.0002 ◽

1943 ◽

Vol 4 (12) ◽

pp. 271-275

Keyword(s):

East Africa ◽

Geological Structure ◽

Geological Mapping ◽

Geological Survey ◽

Intimate Contact ◽

The North ◽

South Wales ◽

New Information ◽

Original Survey ◽

The One

Walcot Gibson was born at Bromsgrove, Worcestershire, on 24 August 1864. His father was a bank manager from the north country and his mother was Cornish, and they had three sons and one daughter. Gibson was educated at the Bromsgrove School and about 1882 went to Mason College, Birmingham, now the University of Birmingham. Charles Lapworth who had distinguished himself by his great researches in the south of Scotland had just been appointed to the chair of Geology at Mason College and thirty-one years later (1913) he records that Gibson was his first geological pupil. His interest in geology and geological mapping was developed by intimate contact with Lapworth and was sustained by a coterie of ardent amateur geologists, among them Joseph Landon, Fred Cullis and C. J. Gilbert. This period clearly determined Gibson’s choice of a career. After a course at the Royal College of Science he set out in 1889 on Lapworth’s advice for South Africa where he was engaged for two years on mineral surveys in the Rand goldfields and elsewhere. From there he moved to East Africa where he was engaged for another two years on mineral surveys for the East Africa Company. He returned to this country an experienced geologist and surveyor and in 1893 he joined H.M. Geological Survey in which service he remained for thirty-two years until his retirement in 1925. This was an important period in the history of the Geological Survey for owing to strong representations that the old Survey had become obsolete both in topography and geology, the House of Commons in 1891 sanctioned a resurvey of the great South Wales Coalfield on the scale of six inches to the mile. The first mapping of that field initiated by Logan and de la Beche was on the one-inch scale and was completed about 1845, the year in which the Geological Survey was transferred from the Board of Ordnance. The enormous developments which had taken place since the original survey had far outstripped the knowledge of the geological structure of the field and new information had become urgently necessary.

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Multi-Phase Tectonic Movements and Their Controls on Coalbed Methane: A Case Study of No. 9 Coal Seam from Eastern Yunnan, SW China

Energies ◽

10.3390/en13226003 ◽

2020 ◽

Vol 13 (22) ◽

pp. 6003

Author(s):

Ming Li ◽

Bo Jiang ◽

Qi Miao ◽

Geoff Wang ◽

Zhenjiang You ◽

...

Keyword(s):

Coalbed Methane ◽

Normal Fault ◽

Geological Structure ◽

Local Deformation ◽

Gas Content ◽

Reverse Fault ◽

Geological Structures ◽

Dextral Shear ◽

Multi Phase ◽

Tectonic Movements

Multi-phase tectonic movements and complex geological structures limit the exploration and hotspot prediction of coalbed methane (CBM) in structurally complex areas. This scientific problem is still not fully understood, particularly in the Bumu region, Southwest China. The present paper analyses the occurrence characteristics and distribution of CBM based on the comprehensive analysis of CBM data. In combination with the analysis of the regional tectonics setting, geological structure features and tectonic evolution. The control action of multi-phase tectonic movements on CBM occurrence are further discussed. Results show that the Indosinian local deformation, Yanshanian intense deformation, and Himalayan secondary derived deformation formed the current tectonic framework of Enhong synclinorium. The intense tectonic compression and dextral shear action in the Yanshanian and Himalayan movements caused the complex geological structures in Bumu region, composed of the Enhong syncline, associated reverse faults and late derived normal fault. The CBM distribution is complex, which has the central and western NNE-trending high gas content zones along the syncline hinge zone and the reverse faults. The geological structure controls on CBM enrichment are definite and important. Based on geological structure features and responses of gas content, methane concentration, and gas content gradient, the gas controlling patterns of geological structure are determined and can be classified into five types: the reverse fault sealing, syncline sealing, monoclinal enrichment, normal fault dispersion, and buried floor fault dispersion types. The structural compression above the neutral surface plays an important role in the syncline sealing process, which is indicated by an increase in gas content gradient. The EW-trending tectonic intense compression and dextral shear action in the Himalayan movement avoided the negative inversion of NNE-trending Yanshanian compressive structure and its destruction of CBM reservoir. However, the chronic uplift and derived normal fault during Himalayan period caused the constant dissipation of CBM.

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Geological Structure Interpretation of Coalbed Methane Enrichment Area based on VMDC and Curvature Attributes

Energies ◽

10.3390/en12152852 ◽

2019 ◽

Vol 12 (15) ◽

pp. 2852

Author(s):

Yaping Huang ◽

Hanyong Bao ◽

Xuemei Qi

Keyword(s):

Coalbed Methane ◽

Time Window ◽

Positive Curvature ◽

Random Noise ◽

Correlation Coefficients ◽

Normal Fault ◽

Geological Structure ◽

Geological Structures ◽

Structure Characteristics ◽

Geological Models

Geological structures play a leading role in the occurrence characteristics of coalbed methane (CBM), and curvature attributes are an important geometric seismic attribute that can be used to identify a geological structure. In view of the characteristics of curvature attributes which are easily affected by noise, this paper proposes a method based on variational mode decomposition and correlation coefficients (VMDC) for denoising, and then extracts curvature attributes for geological structure interpretation. The geological models with anticline, syncline and normal fault structure characteristics are constructed, and curvature attributes of geological models without noise and with different percentages of random noise are calculated respectively. According to the time window test results, the 5 × 5 time window is more suitable in the case of no noise, while 9 × 9 time window is more suitable when there is noise. The results also show that both the median filtering and VMDC can suppress random noise, but VMDC can suppress noise better and improve the accuracy of curvature attributes. Mean curvature attributes can effectively identify geological structures such as anticlines, synclines and faults. Gauss curvature is not ideal for identifying geological structures. Both the maximum positive curvature and the minimum negative curvature have obvious responses to some geological structures. The method has been applied to a CBM enrichment area prediction in Qinshui Basin, China, and the geological structure characteristics of this area have been preliminarily interpreted. The known CBM content information verifies the feasibility and effectiveness of the proposed method.

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New insights into the geological structure of the Netherlands; results of a detailed mapping project

Netherlands Journal of Geosciences – Geologie en Mijnbouw ◽

10.1017/s0016774600000329 ◽

2012 ◽

Vol 91 (4) ◽

pp. 419-446 ◽

Cited By ~ 30

Author(s):

H. Kombrink ◽

J.C. Doornenbal ◽

E.J.T. Duin ◽

M. den Dulk ◽

J.H. ten Veen ◽

...

Keyword(s):

Standard Deviation ◽

The Netherlands ◽

Seismic Data ◽

Geological Structure ◽

Geological Mapping ◽

3D Seismic ◽

Structural Element ◽

Potential Reservoir ◽

3D Seismic Data ◽

New Reservoir

AbstractA five years geological mapping project, in which the Netherlands Continental Shelf has been re-examined using all publicly available data, resulted in an important update of the existing dataset. The stratigraphy of over 400 wells has been re-interpreted. New depth and thickness grids, based mainly on the interpretation of 3D seismic data have been produced for the most important stratigraphic intervals from Permian Upper Rotliegend to Neogene. New reservoir grids describe the top, base and thickness of 30 (potential) reservoir units in the area. In addition, the uncertainty related to interpretation and further processing of the data has been assessed. This resulted in maps displaying the standard deviation for the depth of the main stratigraphic intervals. Based on these results and the data already available for the onshore area, an updated structural element map was made for the Netherlands.

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EFFECT OF GEOLOGICAL STRUCTURE AND BLASTING PRACTICE IN FLY ROCK ACCIDENT AT JOHOR, MALAYSIA

Jurnal Teknologi ◽

10.11113/jt.v78.9634 ◽

2016 ◽

Vol 78 (8-6) ◽

Cited By ~ 3

Author(s):

Edy Tonnizam Mohamad ◽

Bhatawdekar Ramesh Murlidhar ◽

Danial Jahed Armaghani ◽

Rosli Saad ◽

Chang Shiang Yi

Keyword(s):

Ground Vibration ◽

Geological Structure ◽

Construction Site ◽

Rock Blasting ◽

Geological Structures ◽

Danger Zone ◽

Blasting Operation ◽

Mining Sites ◽

Blast Design ◽

Geological Discontinuity

Blasting operation is common method in hard rock excavation at civil engineering and mining sites. Rock blasting results in the fragmentation along with environmental hazards such as fly rock, ground vibration, air-blast, dust and fumes. Most of the common accidents associated with blasting are due to fly rock. A fly rock accident had occurred on 15 July 2015 at a construction site at Johor, Malaysia. Due to this accident, nearby factory worker was killed while two other workers were seriously injured after being hit by rock debris from an explosion at construction site, 200 m away from the factory. The main purpose of this study is to investigate the causes of fly rock accident based on geological structures and blasting practice such as blast design, pre inspection on geological structures, identifying danger zone due to blasting and communication and evacuation of personnel before blast. It can be concluded that fly rock could have been controlled in three stages; initial drilling of holes based on blast design, ensure limiting charge for holes having less burden or having geological discontinuity, and selecting proper sequence of initiation of holes.

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