Study leakage of fault with geochemical techniques

Hou Dujie; Zhu Junzhang; Tang Youjun; Xiao Zhongyao; Wang Qinghua

doi:10.11743/ogg20040517

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Study leakage of fault with geochemical techniques
Vol. 25, Issue 5, Pages: 565-569(2004)
Online First：25 October 2004，

Published：2004
DOI： 10.11743/ogg20040517
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DOI：

Hou Dujie, Zhu Junzhang, Tang Youjun, et al. Study leakage of fault with geochemical techniques[J]. 2004, 25(5): 565-569. DOI： 10.11743/ogg20040517.

摘要

应用地球化学方法进行断层的渗漏性判定是油藏地球化学近年的新进展之一。根据原油中正构烷烃的分布和生物标志物特征

柯克亚油藏存在着5种原油类型

即第一类基态原油、第二类运移分馏残余油、第三类蒸发-反凝析形成的凝析油和轻质油、第四类气洗残余原油及第五类发生晶析作用的原油。其中第二类原油主要分布在构造的顶部

说明原油沿小断层和构造顶部发生了渗漏

造成古今油水界面明显不同。原油分子地球化学分析结果也证实

在构造的顶部原油成熟度相对较高

重质组分和不易运移的组分相对较高。

Abstract

It is one of the new advances in reservoir geochemistry to study leakage of fault with geochemical techniques.According to the distribution of n-alkane and the characteristics of biomarkers

there exist 5 types of crude in Kokyar oil reservoir

including original-state oil

residual oil from fractionation through migration

condensate and light oils from evaporation and retrograde condensation

residual crude from gas washing

and crude with wax crystallization.The second type of crude is mainly distributed on the top of the structure

indicating that leakage occurred along small faults and the top of the structure

leading to the obvious difference between ancient and present OWC.Moreover

molecular geochemical analysis of the crude verifies that crude on the top of the structure have relatively higher maturity and higher contents of heavy components and those uneasily to be migrated.