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《GEOCHIMICA》 1996-01
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GEOCHEMISTRY OF HYDROCARBON FOR OIL─GAS MICROLEAKAGE IN INNER OF CRATON BASIN ──TAKING CHENGCHUAN No.1 WELL OF ORDOS BASIN AS AN EXAMPLE

Zhang Tongwei; Wang Xianbin; Shen Qixiang; Cheng Xuehui(State Key Laboratory of Gas Geochemistry, Lanzhou institute of Geology, Chinese Academy of Sciences,Lanzhou 730000)Wang Xifu; Yang Xiaoyuan; Sun Liuyi(Institute of Geological Science, Changqing Petro  
Acidolysis, pyrolysis and extracted hydrocarbon samples from a deep well in the inner of Ordos basin, eastern China are studied, and the recognizable geochemical traces of oil-gas microleakage in the shallow section are discussed combining the variation of concentration of total organic matter and the distribution of oil and gas layers developed in the whole section.The section from 0 to 1220m depth in the well has a low concentration of total organic matter, which ranges from 0.06% to 0.3% with an average of 0.11%, and a low t(max) value,which is less than 400℃, showing that the organic matter is in immaturity stage. The lithology is mainly red or lateritic siltstone and greyish sandy mudstone and siltstone, indicating that it is unfavorable for organic matter to generate hydrocarbon. But the section has much larger ratios of C1/ TOC, S1/ (S1+S2) and C(2+) / TOC than those of the underlying mature sections. The OEP value of saturated hydrocarbon is 1.11─1.14 and the ratio of saturated HC/aromatic HC 5.2─6.4, showing the feature of mature HC without odd─even predominance. The shallow anomaly of methane and heavier hydrocarbon still exist after homogenized by propylene, indicating that such an anomaly is caused by thermal genetic hydrocarbon migrating from deep mature section other than by biogenic gases in situ. There is no fault in this basin, so the main migration mechanism for deep oil-gas should be the microleakage of oil─gas through the microfracture and pore system of sedimentary rocks.Therefore, it can be seen that the microleakage of oil─gas may leave recognizable geochemical traces in the shallow sedimentary layers.
【CateGory Index】: TE12
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