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

摘要/Abstract

摘要：

地下水水文地质地球化学性质与油气运移、聚集和保存存在密切关系。地下水在纵向上可划分为3个不同区带,即自由交替带、交替阻滞带和交替停止带。交替停滞带是不受地表水影响的水文地质带,有利于油气保存;自由交替带受地表水强烈影响,长期冲刷、氧化,不利于油气保存。中国南方海相地层的油气藏被构造运动改造的强度大,油气保存条件破坏严重。在详细地分析了南方几个主要油气勘探区块的地下水水文地质地球化学特点及其与油气保存条件的关系后,提出了封存大气水的概念,论述了封存大气水的形成过程及其地球化学的基本特点。不整合面附近的封存大气水应该可以认为是油气藏被破坏和保存条件差的标志。在此基础上,针对中国南方海相地层初步总结了一套比较系统的油气保存条件的水文地球化学综合判别指标体系。

关键词: 封存大气水, 油气保存, 水文地质, 水文地球化学, 中国南方海相地层

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

中图分类号:

TE125.4

楼章华,朱蓉. 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[J]. 石油与天然气地质, 2006, 27(5): 584-593. doi: 10.11743/ogg20060502 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. doi: 10.11743/ogg20060502

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