油气藏全空间磁学、地球化学与矿物学结构及意义——检验“烟筒效应”的形成机理

刘庆生; 李海侠; 王芳; 田志; 王艾红; 陈龙生; 张双喜; 夏响华; 程同锦

Volume 27 Issue 5

Sep. 2002

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Article Navigation > Earth Science > 2002 > 27(5): 637-644

LIU Qing-sheng, LI Hai-xia, WANG Fang, TIAN Zhi, WANG Ai-hong, CHEN Long-sheng, ZHANG Shuang-xi, XIA Xiang-hua, CHENG Tong-jin, 2002. Magnetic, Geochemical and Mineralogical Structure and Significance in Complete Space of Oil and Gas Reservoir: Implications for Formation Mechanism of 'Chimney Effect. Earth Science, 27(5): 637-644.

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Magnetic, Geochemical and Mineralogical Structure and Significance in Complete Space of Oil and Gas Reservoir: Implications for Formation Mechanism of "Chimney Effect

1.
Department of Geophysics, China University of Geosciences, Wuhan 430074, China
2.
Department of Earth Sciences, The University of Hong Kong, Hong Kong
3.
Institute of Petroleum Geochemistry, SINOPEC, Hefei 230022, China

Received Date: 2002-06-18
Publish Date: 2002-09-25

Abstract

Abstract

Magnetic measurements of rocks in an oil and gas bearing well located on the margin of an oil and gas field, southern Songliao basin, show that the rocks there are characterized by the conspicuous magnetic anomalous structure. The magnetic susceptibility anomalies (κ), for example, are classified as two categories: the high intensity (κ > 400×10^-5) and the moderate intensity (κ : 100×10^-5 - 150×10^-5) on the low background magnetism. As shown in the interpretation of the logging references and the geochemical analysis, the strong magnetic anomaly is located mainly in the dry layer at the bottom of the sampling interstitial positions. Few samples are located in the oil and gas display layer in the shallow part of the field. The intermediate magnetic anomaly is located in the oil and gas display layer at the depth around 2 700 meters. The correlation between the magnetism and geochemical compositions shows a positive correlation between geochemical compositions C₁, C₂ and magnetic intensities parameters (i.e. susceptibility κ, saturation magnetization J_s and saturation isothermal remnant magnetization SIRM), but a negative correlation between geochemical compositions C₁, C₂ and intrinsic coercivity in the rocks of the oil and gas bearing layers. However, these correlations are not found in dry layers. The analysis of the iron bearing mineral compositions indicates that the major iron bearing minerals in the rocks are magnetite, maghemite, hematite, pyrite and siderite. In particular, the maghemite distributes mainly in the oil and gas bearing layer with the intermediate magnetic intensity. But the magnetite with the iron contents of 12.5% distributes mainly in the dry layer at the bottom. The correlations in contents between maghemite and hematite and between pyrite and siderite indicate that the authigenous maghemite may have originated largely from the autochthonous hematite and pyrite. It can be inferred that the maghemite, whose magnetic intensity is weak inclined in the rocks of the oil and gas bearing layer, is a product of the hydrocarbon alteration, providing us with some new evidence for the complete space formation mechanism of the hydrocarbon micro percolation effect (or chimney effect).
- hydrocarbon alteration,
- secondary magnetic mineral,
- rock magnetism,
- geochemistry,
- mineralogy,
- oil and gas reservoir

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References(28)

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