ASSESSMENT OF HYDROCARBON ACCUMULATION ZONE IN ORDOVICIAN CARBONATE ROCKS BY SEQUENCE-STRATIGRAPHY

Lei Qingliang; Xu Huaida

doi:10.11743/ogg19940410

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ASSESSMENT OF HYDROCARBON ACCUMULATION ZONE IN ORDOVICIAN CARBONATE ROCKS BY SEQUENCE-STRATIGRAPHY
Vol. 15, Issue 4, Pages: 334-340(1994)
Online First：25 December 1994，

Published：1994
DOI： 10.11743/ogg19940410
稿件说明：

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DOI：

Lei Qingliang, Xu Huaida. ASSESSMENT OF HYDROCARBON ACCUMULATION ZONE IN ORDOVICIAN CARBONATE ROCKS BY SEQUENCE-STRATIGRAPHY[J]. 1994, 15(4): 334-340. DOI： 10.11743/ogg19940410.

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.