Extraction of Mineral Alteration Zone from ETM+ Data in Northwestern Yunnan, China

2008 ◽  
Vol 19 (4) ◽  
pp. 416-420 ◽  
Author(s):  
Z ZHIFANG ◽  
Z YUJUN ◽  
C QIUMING ◽  
C JIANPING
Keyword(s):  
Alteration Zone ◽  
Mineral Alteration ◽  
Northwestern Yunnan

scholarly journals Pendugaan Temperatur Bawah Permukaan Berdasarkan Kehadiran Mineral Alterasi Pada Sumur Llk-1 Lapangan Panasbumi Lilli, Kabupaten Polewali Mandar, Provinsi Sulawesi Barat

2017 ◽  
Vol 14 (3) ◽  
pp. 287
Author(s):  
Fazillah Adzka ◽  
Aton Patonah ◽  
Simarmata S. L. Robertus
Keyword(s):  
Mineral Composition ◽  
Geothermal Field ◽  
Alteration Zone ◽  
Mineral Association ◽  
Oxide Mineral ◽  
The North ◽  
Primary Mineral ◽  
Mineral Alteration

Lapangan Panasbumi Lilli secara adminstratif  termasuk ke dalam wilayah Kecamatan Matanga, Kabupaten Polewali Mandar, Provinsi Sulawesi Barat. Hasil penyelidikan terdahulu diketahui memiliki daerah prospek seluas 18 km2 yang masih membuka ke arah utara. Fokus penelitian ini adalah memperkirakan temperatur bawah permukaan dari sumur  LLK-1 untuk menentukan zona reservoir dan zona penudungnya. Metode yang digunakan adalah petrografi dan alat SpecTerra untuk mengetahui jenis mineral lempung. Berdasarkan deskripsi dan analisis komposisi mineral primer dan alterasi pada batuan dari sumur tersebut diketahui bahwa batuan pada sumur LLK-1 dari bawah ke permukaan adalah porfiri andesit terubah dan andesit terubah. Mineral alterasi yang hadir adalah saponite, monmorilonite, smectite, chlorite, mineral oksida dan pirit. Berdasarkan asosiasi mineral alterasi tersebut, zona alterasi terbagi ke dalam 2 zona, yaitu zona smectite dan zona smcetite-chlorite yang merupakan sebanding dengan tipe argilik dan subprofilitik, terbentuk pada temperatur 50oC – 230oC.  Hasil data tersebut, maka sumur LLK-1 masih  termasuk ke dalam zona penudung. Kata Kunci : Alterasi, Paleotemperatur, Panasbumi Lilli Lilli Geothermal Field administratively located in Matanga, Polewali Mandar Districts, West Sulawesi. Result from latest investigation shows that this area have a prospect about 18 km2 with distribution spreading probabilility to the North. Focus of this research is to estimate temperature below the surface from well LLK-1 (Lilli Geothermal field) to understand the reservoir and caps rock zone using petrography and SpecTerra measurement.  Based on description and primary mineral composition, also from mineral alteration, well LLK-1 has altered andecite porfiri to altered andecite. Alteration mineral that can be found are saponite, montmorilonite, smectite, chlorite, oxide mineral and pyrite. From the alteration mineral association, alteration zone can be divided into two zone, there are smectite and smectite-chlorite zone that comparable with argilic and subpropilitic type that can be formed at 50°C - 230°C. It is conclude that LLK-1 well still include in the caps rock zone so the reservoir zone cannot be determined.  Keywords: Alteration, Paleotemperature, Lilli Geothermal Field

Detection of slip surface in earth slide based on mineral assemblages -An example of hydrothermal alteration zone landslide in East Hokkaido Japan-

2014 ◽  
Vol 51 (3) ◽  
pp. 106-112
Author(s):  
Hiroyuki MAEDA ◽  
Masanori KOHNO ◽  
Yoshihiko SEKISHITA ◽  
Satoshi UEMATSU ◽  
Hiroshi NAYA
Keyword(s):  
Hydrothermal Alteration ◽  
Slip Surface ◽  
Alteration Zone ◽  
Mineral Assemblages

A new species of the montane lacewing genus Rapisma McLachlan (Neuroptera, Ithonidae) from northwestern Yunnan, China

Zootaxa ◽  
2020 ◽  
Vol 4763 (3) ◽  
pp. 439-443
Author(s):  
XINGYUE LIU
Keyword(s):  
New Species ◽  
Southeast Asia ◽  
East Asia ◽  
South Asia ◽  
The Family ◽  
A New Species ◽  
Northwestern Yunnan

The genus Rapisma McLachlan, 1866 (montane lacewings) is a rare and little known group of the family Ithonidae (Insecta: Neuroptera). There have been 21 described species of Rapisma, and all of them are distributed from East Asia, South Asia and Southeast Asia. Here I report a new species of Rapisma from northwestern Yunnan, China, namely Rapisma weixiense sp. nov. The new species belongs to a group of Rapisma species with very short antennae. 

Benefits of the induced polarization geoelectric method to hydrocarbon exploration

Geophysics ◽  
2009 ◽  
Vol 74 (2) ◽  
pp. B47-B59 ◽  
Author(s):  
Paul C. Veeken ◽  
Peter J. Legeydo ◽  
Yuri A. Davidenko ◽  
Elena O. Kudryavceva ◽  
Sergei A. Ivanov ◽  
...  
Keyword(s):  
Processing Parameters ◽  
Induced Polarization ◽  
Hydrocarbon Exploration ◽  
Petroleum Exploration ◽  
Alteration Zone ◽  
Impermeable Barrier ◽  
Reasonable Cost ◽  
Impermeable Layer ◽  
Local Enrichment ◽  
Target Depth

Delineation of hydrocarbon prospective areas is an important issue in petroleum exploration. The geoelectric method helps to identify attractive areas and reduces the overall drilling risk. For this purpose, induced polarization (IP) effects are mapped caused by the presence of epigenetic pyrite microcrystals in sedimentary rocks. These crystals occur in a shallow halo-shaped mineralogical alteration zone, often overlying a deeper-seated hydrocarbon accumulation. Local enrichment in pyrite results from reducing geochemical conditions below an impermeable layer. The imperfect top seal of the accumulation permits minor amounts of hydrocarbons to escape and migrate through the overlying rocks to shallower levels. During migration, hydro-carbons encounter an impermeable barrier, forming an altera-tion zone. Induced polarization logging and coring in wells confirm this working model. Geoelectric surveying visual-izes anomalies in electric potential difference measured be-tween receiver electrodes. The differentially normalized method (DNME) inverts the registered decay in potential differences, establishing a depth model constrained by seismic and petro-physical data. Diagnostic geoelectric attributes are proposed, giving a better grip on chargeability and resistivity distribution. Acquisition and processing parameters are adjusted to the target depth. Encouraging results are obtained in deeper [Formula: see text] as well as in very shallow water. Onshore, a grounded current transmitter is used. Geoelectric surveys cover different geologic settings with varying target depths. The success ratio for predicting hydrocarbon occurrences is high. So far, 40 successful wells have been drilled in Russia on mapped geoelectric anomalies. Out of 126 wells, the method produced satisfactory results in all but two cases. The technique reduces the risk attached to new hydrocarbon prospects and allows better ranking at a reasonable cost.

Identification ofPhytophthoraspecies baited and isolated from forest soil and streams in northwestern Yunnan province, China

2013 ◽  
Vol 43 (2) ◽  
pp. 87-103 ◽  
Author(s):  
W.-x. Huai ◽  
G. Tian ◽  
E. M. Hansen ◽  
W.-x. Zhao ◽  
E. M. Goheen ◽  
...  
Keyword(s):  
Forest Soil ◽  
Yunnan Province ◽  
Northwestern Yunnan
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