scholarly journals POSSIBILITY OF USING GRAVITY ANOMALIES IN THE SEARCH FOR SALT-DOME OIL AND GAS POOLS

Science ◽  
1917 ◽  
Vol 46 (1197) ◽  
pp. 553-556
Author(s):  
E. W. Shaw
Keyword(s):  
Oil And Gas ◽  
Gravity Anomalies ◽  
Salt Dome

scholarly journals PROSPEK SUMBER DAYA ENERGI BERDASARKAN ANALISIS POLA ANOMALI GAYA BERAT DI DAERAH BIAK DAN SEKITARNYA, PAPUA

2016 ◽  
Vol 13 (2) ◽  
pp. 87 ◽  
Author(s):  
Saultan Panjaitan ◽  
Subagio Subagio
Keyword(s):  
Gravity Anomaly ◽  
Oil And Gas ◽  
East Coast ◽  
Gravity Anomalies ◽  
Source Rocks ◽  
Reservoir Rock ◽  
Ultramafic Rocks ◽  
Reservoir Rocks ◽  
Northern City ◽  
Fluid Reservoir

Hasil penelitian gayaberat di Pulau Biak menghasilkan anomali gayaberat yang dikelompokkan kedalam 2 (dua) satuan yaitu anomali gayaberat 50 mGal hingga 120 mGal membentuk rendahan anomali mencerminkan cekungan. Kelompok anomali gayaberat 120 mGal hingga 220 mGal membentuk tinggian anomali. Pola tinggian anomali sisa 0 mGal hingga 2 mGal diduga sebagai perangkap struktur migas yang terdapat di daerah Kota Biak utara, Mandon dan lepas pantai timur P. Pai. Batuan bertahanan jenis rendah antara 0 - 16 Ohm-meter yang mengindikasikan batuan reservoir jenuh fluida terbentuk di kedalaman 2500 meter. Kedalaman batuan dasar terbentuk antara 7000-8500 meter, dengan rapat massa batuan 2.9 - 3.1 gr/cm3 bertahanan jenis tinggi 1000-8200 Ohm-meter diduga sebagai cerminan dari batuan ultramafik kerak samudera. Batuan yang menyusun di daerah penelitian terdiri atas lapisan batuan Tersier dengan rapat massa 2.45 gr/cm3, batuan Pra-Tersier dengan rapat massa 2.75 gr/cm3 dan batuan dasar dengan rapat massa 3.1 gr/cm3. Batuan sumber adalah serpih Formasi Makat berumur Miosen dengan rapat massa batuan 2.45 gr/cm3, sedangkan batuan reservoir terdiri dari batupasir Formasi Mamberamo. Kata kunci Gayaberat, cekungan, migas, anomali sisa, rapat massa, sesar, antiklin, batuan sumber, tahanan jenis. Gravity research on the island of Biak gravity anomalies are grouped into two (2) units is a gravity anomaly 50 mgal up to 120 mgal is basin reflecting. Gravity anomaly 120 mgal up to 220 mgal formed heights anaomaly. Altitude residual anomaly from 0 mGal to 2 mgal is oil and gas as trapping structures contained in the northern City of Biak, off the east coast Mandon and P. Pai. The rocks is of low resistivity between 0 -16 Ohm-meter that indicates the saturated fluid reservoir rocks are in the depths of 2500 meter. The depth of the bedrock formed between 7000-8500 meters, with density 2.9 - 3.1 gr / cm3 is heights resistivity types of 1000-8200 Ohm-meter interpreted as a reflection of ultramafic rocks oceanic crust. The rocks in the study area consists of Tertiary rocks layers with a density 2.45 gr / cm3, the Pre-Tertiary rocks with density 2.75 gr / cm3 and bedrock with density 3.1 gr / cm3. The source rocks is of shale from Makat Formation Miocene age with density 2.45 gr / cm3, and the reservoir rock consists of sandstone Mamberamo Formation. Keywords: Gravity, basin, oil and gas, recidual anomaly, density, fault, anticline, source rocks, resistivity.

scholarly journals Gravity anomalies, sub-surface structure and oil and gas migration in the Mamfe, Cameroon-Nigeria, sedimentary basin

2007 ◽  
Vol 46 (2) ◽  
pp. 129-139
Author(s):  
Théophile Ndougsa-Mbarga ◽  
Eliezer Manguelle-Dicoum ◽  
José-Oscar Campos-Enriquez
Keyword(s):  
Surface Structure ◽  
Oil And Gas ◽  
Sedimentary Basin ◽  
Gravity Anomalies ◽  
Gas Migration

Este estudio reporta resultados preliminares de una interpretación formal de datos existentes de un área hasta hoy desprovista de estudios geofísicos, la cuenca de Mamfe (Camerún nor-occidental/ Nigeria sur-oriental). La importancia de esta cuenca se comprende por el hecho de que está genéticamente relacionada con la depresión de Benue productora de hidrocarburos. Los mapas de anomalías gravimétricas regional y residual proporcionaron información sobre la estructura de la cuenca. Las componentes gravimétricas regional y residual se obtuvieron ajustando con el método de mínimos cuadrados una superfi cie polinomial de tercer grado a la anomalía de Bouguer. La anomalía residual de tercer orden revela la presencia de dos bajos gravimétricos orientados NE-SW. La anomalía occidental cubre las poblaciones de Ekok y Agbokem, y la oriental comprende a Mukonyong, Mamfe y Bachuo Akagbe. Dos cinturones orientados aproximadamente E-W de anomalías gravimétricas positivas limitan por el norte y el sur respectivamente a las anomalías antes descritas. En general los bajos gravimétricos son debidos al relleno sedimentario de la cuenca, en tanto que las anomalías residuales positivas son el producto de afloramientos del complejo basamental. El patrón de las anomalías nos permite inferir las características generales de la cuenca. Ella comprende dos sub-cuencas separadas por un alto estructural. La cuenca occidental es la más profunda y compuesta. Comprende dos sub-cuencas separadas por un alto estructural menor, posiblemente relacionado con la continuación hacia la cuenca del complejo cristalino. En general, estas sub-cuencas tienden a ser más someras hacia el oriente indicando que la cuenca evolucionó de oeste a este. Las direcciones de migración de hidrocarburos probablemente generados en el depocentro han sido indicadas. La acumulación de hidrocarburos a lo largo de estas direcciones es posible, pero estudios sísmicos y gravimétricos más detallados deben ser emprendidos para buscar trampas estructurales o estratigráficas. Este estudio puede servir de base a un programa integral de exploración petrolera.

Subsalt imaging in northern Germany using multiphysics (magnetotellurics, gravity, and seismic)

2020 ◽  
Vol 8 (4) ◽  
pp. SQ15-SQ24
Author(s):  
Christian H. Henke ◽  
Markus H. Krieger ◽  
Kurt Strack ◽  
Andrea Zerilli
Keyword(s):  
Oil And Gas ◽  
Gravity Data ◽  
Salt Dome ◽  
Gravity Modeling ◽  
Field Source ◽  
Oil And Gas Exploration ◽  
Exploration Drilling ◽  
Seismic Depth Migration ◽  
Improved Model ◽  
Subsalt Imaging

Imaging subsalt is still a challenging task in oil and gas exploration. We have used magnetotellurics (MT) to improve the integration of seismic and gravity data to image the Wedehof salt dome, located in the Northern German Basin. High-density natural field source broadband MT data were acquired and enhanced the definition of the top and overhanging salt structures in addition to imaging the salt dome root. Salt boundaries show strong resistivity contrasts with the surrounding sediments and thus represent a good target for electromagnetic measurements, especially for top salt and salt flanks imaging. With integrated 3D gravity modeling focusing on the salt dome’s flanks at intermediate depths, an improved model was achieved. The new model provided sound input to a follow-up seismic depth migration that led to an improved imaging of the subsalt target proven by subsequent exploration drilling. The integrated interpretation of MT, gravity, and seismic combines the strengths of the different physics, thus increasing imaging reliability and reducing exploration drilling risks. Using a conservative workflow that included a feasibility study with field noise evaluation and careful acquisition parameter testing prior to survey start, a broadband array data acquisition, and advanced processing, the survey area's severe cultural noise issues could be overcome.

Interpreting of Magnetic and Gravity Anomalies for Regional Oil and Gas Prognosis

2003 ◽  
Author(s):  
V.K. Policarpov ◽  
S.A. Kozlov ◽  
N.F. Skopenko ◽  
M.B. Shtokalenko
Keyword(s):  
Oil And Gas ◽  
Gravity Anomalies ◽  
Magnetic And Gravity Anomalies

The New Salt-Dome Area of Kazakhstan and its Oil and Gas Prospects

1995 ◽  
Author(s):  
N. G. Davydov ◽  
K. Sydykov ◽  
V. Sorokin
Keyword(s):  
Oil And Gas ◽  
Salt Dome

QUANTITATIVE ANALYSIS OF THE RELATIONSHIP BETWEEN THE SIZE AND LOCATION OF OIL AND GAS FIELDS WITH GRAVITATIONAL ANOMALIES OF THE FERGANA DEPRESSION

2020 ◽  
Vol 2020 (3) ◽  
pp. 95-112
Author(s):  
R Umurzakov ◽  
◽  
S Rabbimkulov
Keyword(s):  
Oil And Gas ◽  
Gravity Anomalies ◽  
Geological Structure ◽  
Gas Content ◽  
Effective Volume ◽  
Oil And Gas Fields ◽  
Local Gravity ◽  
Gas Fields ◽  
The Impact ◽  
Gravitational Anomalies

Based on the analysis of published materials, it is noted that the degree of connection between the indicators of the anomalies of the gravitational field and oil and gas content remains unclear. The aim of the research was to study the nature of the dependence and assess the degree of connection between the size and location of oil and gas fields with gravitational anomalies using the example of the Fergana oil and gas region. To solve this problem, the published material on the geological structure and data on the sizes (effective volume) of deposits, as well as data on deep anomalies of the gravity field in the Fai reduction, were used. The study involved about 70 deposits. Analysis of variance showed that the “influence” of the deep anomaly factor on the effective volume of the fields in the Fergana depression is significant and reliable with a probability of 0.99. At the same time, the share of the influence of this factor on the effective volume of oil deposits in relation to the total impact of all factors is 42%, and for oil and gas - 62%. This testifies to the significant influence of deep subcrustal processes that create corresponding gravitational effects on the formation of the size and location of oil and gas fields in the Fergana depression. According to local gravity anomalies, the impact on the location and effective volumes of deposits is significant, but the reliability is low. The degree of influence on them remains unclear. The results obtained can be used to develop methods for forecasting promising areas for performing high-priority geological exploration works.

scholarly journals A Gravity Search for Oil and Gas and Groundwater in Egypt Using the Strike Angles Derived from EIGEN 6C4

2020 ◽  
Vol 10 (24) ◽  
pp. 8950
Author(s):  
Jaroslav Klokočník ◽  
Jan Kostelecký ◽  
Lenka Varadzinová ◽  
Aleš Bezděk ◽  
Gunther Kletetschka
Keyword(s):  
Gravity Field ◽  
Oil And Gas ◽  
Field Model ◽  
Gravity Anomalies ◽  
Archaeological Sites ◽  
Gravity Field Model ◽  
Topography Model ◽  
Oil Gas ◽  
The Relationship ◽  
Strike Angle

We correlate the gravity aspects (descriptors), namely the strike angles, derived from a recent gravity field model, with the known oil, gas and groundwater deposits/reservoirs and hypothetical paleolakes with the locations of archaeological sites. This allows us to extrapolate the investigation, by analogy, to unknown regions. The gravity aspects, derived from the EIGEN 6C4 gravity field model, are used, together with EMAG 2 magnetic anomalies and ETOPO 1 topography model, for the investigation of oil, gas and water deposits in Egypt. One of the gravity aspects, s/c strike angle, is significantly combed (oriented in one direction locally) in places where the known deposits exist. However, they are combed also in some other places. This may be used as a guide as to where to seek new and promising deposits. Accounting for the combed strike angles and the relationship between gravity anomalies and height differences, we reconstructed potential paleolakes under thick sand layers in the Great Sand Sea, Western Egypt (our previous work), and between Kharga and Toshka, Southern Egypt (this work), consistent with the known archaeological sites.

Detection of reservoirs from normalized full gradient of gravity anomalies and its application to Shengli oil field, east China

Geophysics ◽  
2002 ◽  
Vol 67 (4) ◽  
pp. 1138-1147 ◽  
Author(s):  
Hualin Zeng ◽  
Xiaohong Meng ◽  
Changli Yao ◽  
Xiaomeng Li ◽  
Hai Lou ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Gravity Anomalies ◽  
Oil Field ◽  
Physical Parameters ◽  
Drilling Data ◽  
Normalized Full Gradient ◽  
High Production ◽  
Centers Of Mass ◽  
Relationship Of ◽  
Gas Bearing

We present how to detect reservoirs by the 3‐D normalized full gradient (NFG) of gravity anomalies constrained by seismic and drilling data. The normalized full gradient represents the full gradient of the gravity anomaly at a point divided by the average of the full gradient at the datum. The closed minima on an NFG map indicate the occurrence and horizontal locations of the centers of mass of density anomalies related to oil reservoirs. This information can be used to select well locations in an oil field. On a cross‐section, the closed minima can be used to estimate the depth to centers of mass of possible hydrocarbon reservoirs. Some characteristics of the NFG are calculated for a hypothetical case of an anticline saturated with oil and gas. The relationship of these characteristics to the geometry and physical parameters of the anticline is studied. Modeling studies show that the NFG largely depends on the number of terms in the Fourier series used to calculate it, and it closely related to the length of the gravity profile or the size of the study area. Applying the NFG method to the Shengli oil field, i.e., using closed minima of NFG alongside drilling data, showed an effectiveness of up to 70%. These results were used to select well locations with the result that some high‐production gas‐bearing strata were discovered by drilling.

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