中国南方海相地层水文地质地球化学特征与油气保存条件

doi:10.11743/ogg20060502

Abstract

Abstract:

The hydrogeological and hydrogeochemical characteristics of ground water are closely related to hydrocarbon migration,accumulation,and preservation conditions.Ground water can be vertically divided into three zones:free exchanging zone,exchanging-retarded zone,and exchanging-stagnant zone.The exchanging-retarded zone is favorable to petroleum preservation because it is not influenced by surface water,while the free exchanging zone,strongly affected by long-time erosion and oxidation of surface water,offers a poor environment for petroleum preservation.Reconstructed by several tectonic activities,the preservation conditions for oil and gas reservoirs of marine strata in southern China is severely disturbed.Through analysis of the hydrogeological and hydrogeochemical characteristics and their relation with hydrocarbon preservation conditions in several exploration areas of southern China,the concept of preserved meteoric water is put forward and the formation of preserved meteoric water and its geochemical characteristics are discussed.The preserved meteoric water occurring near unconformities can be used as an indicator of poor preservation conditions.Based on the concept,a relatively systematic hydrogeochemical index system for distinguishing hydrocarbon preservation conditions is established for the marine strata in southern China.

Key words: preserved meteoric water, hydrocarbon preservation, hydrogeology, hydrogeochemistry, marine strata in southern China

CLC Number:

TE125.4

Lou Zhanghua, Zhu Rong. Hydrogeological and hydrogeochemical characteristics and hydrocarbon preservation conditions in marine strata in southern China[J]. Oil & Gas Geology, 2006, 27(5): 584-593.

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Hydrogeological and hydrogeochemical characteristics and hydrocarbon preservation conditions in marine strata in southern China

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