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用层序地层学评价鄂尔多斯盆地奥陶系碳酸盐岩油气聚集带
石油与天然气地质
1994年 15卷 第No.4期
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Title
ASSESSMENT OF HYDROCARBON ACCUMULATION ZONE IN ORDOVICIAN CARBONATE ROCKS BY SEQUENCE-STRATIGRAPHY
Authors
Lei Qingliang
Xu Huaida
摘要
应用层序地层学基本原理对奥陶系碳酸盐岩含油气性的研究表明:一方面构成奥陶系层序格架的不同单元,具有各异的油气地质意义;另一方面,奥陶系层序格架又构成了一个多层次、多类型油气组合单元.使奥陶系形成了一个独自、封闭的油气聚集系统.尽管它经历了后期多次构造作用的改造、破坏,但其油气的重新聚集仍主要与两种不同级别沉积枢纽带的分布密切相关.
Abstract
The source rocks of Ordovician carbonate rocks in the Ordos Basin are mostly Preserved in darkgrey micrite transgtessive system tracts and early-sarge high water-level system tracts. The transgressive system tracts of Fengfeng and late Majiagou stages are two major oil-generation stages.The formation of reservoir and cap rocks was mainly related to the meteoric diagenesis, Penecontemporaneous dolomitization, and condensing evaporation during the late stage of high water-level system tracts. The upward shallowing penesequence cycles within the sequences formed a series of "self-reservoiring and near-reservoiring "souroe- rsservoir-caprock complexs. Ordovician deposition in the area underwent three platform evolution Periods: gentle-slope platform, rimmed platform and open platform Periods, and formed the main sedimental pivot belt in platform margins and secondary sedimental pivot belts within the platform. It has been proved that oil and gas distribution are related to the above mentioned pivot belts.
关键词：
层序地层学;
沉积枢纽带;
碳酸盐岩;
油气聚集带;
鄂尔多斯;
奥陶系;
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