| 江汉盆地马王庙油田自生磁铁矿与烃运移相互关系研究 |
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| 关键词:authigenic magnetite hydrocarbon microseepage magnetic hysteresis loop mineralogic Jianghan basin |
| 基金项目:国家自然科学基金与地质行业科学技术发展基金联合资助项目（49374216） |
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| A Study of the Relationship between Authigenic Magnetite and Hydrocarbon Migration in Mawangmiao Oil Field From Jianghan Basin |
| Magnetic and mineralogic parameters of well cuttings of II You Formation (Oil-bearing layer in this Region),Paleogene Xingouzi Group from well M36(Oil well)and M46 well (dry well)(two wells situated in Mawangmiao nose structure) are systematicaly mea-sured, in order to evalute secondary alternation associated with hydrocarbon mingration, according s magnetic and mineralogic parameters variation characteristics of well cuttings. Results show that there are strong magnetic layers within II You Formation from well M36 and average values of saturation magnetization Js and saturation istohermal remanent Jr are 352.58A/m, and 60.43A/m, and then well M46 are 147.37A/m and 22.09A/m, respectively. The characteristics of magnetic hysteresis loops indicate that predominant soft magnetic minerals occur within samples of oil-bearling layers (intrinsic coercivity Hc=33.5mT, saturatio magnetic field Hs=0.25T), but are dominantly hard magnetic min-erals in dry layers (Hc=44.2T, Hs=0.4T).The results of heavy mineral analysis indi-cate that well cuttings in well M46 contain abundant detrital magnetite. The results of in-tegrated magnetic with mineralogic analysis show that magnetic carriers within samples with strong magnetism is arthigenicmagnetite, and then siderite and pyrite are non-mag-netic minerals and can not contribute to magnetism of II You Formation in well M36. So, we infer that authigenic magnetite within oil-bearing samples of well M36 may be products due to crude oil biogradation, replacement of ferric-iron in detrital magnetic minerals by ferrous iron under reduction environment and oxidation of siderite in the late stage. These results support intensively reliable genetic correlation between hydrocarbon mingration and the precipitation of authigenic magnetic minerals, and provide important evindences for di-rect location technologies (LDT) oil/gas reservoirs. |
| Liu Qingsheng,Xu Wenkai.1996.A Study of the Relationship between Authigenic Magnetite and Hydrocarbon Migration in Mawangmiao Oil Field From Jianghan Basin[J].Acta Geoscientica Sinica,17(z1):84-90. |
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