Characteristics of hydrocarbon accumulation in the northern edge of Qaidam basin

Gao Xianzhi; Ma Dade; Liu Zhen; Wang Liquan

doi:10.11743/ogg20040621

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Characteristics of hydrocarbon accumulation in the northern edge of Qaidam basin
Vol. 25, Issue 6, Pages: 707-712(2004)
Online First：25 December 2004，

Published：2004
DOI： 10.11743/ogg20040621
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DOI：

Gao Xianzhi, Ma Dade, Liu Zhen, et al. Characteristics of hydrocarbon accumulation in the northern edge of Qaidam basin[J]. 2004, 25(6): 707-712. DOI： 10.11743/ogg20040621.

摘要

运用包裹体均一化温度、包裹体成分以及圈闭演化历史分析等研究方法

对柴北缘典型油气田油气成藏特征进行了分析。结果表明:侏罗系油气藏具有三个油气成藏期

分别为侏罗纪末、渐新世和上新世;下第三系油气藏具有两个成藏期

分别发生在渐新世和上新世

其中渐新世为主要成藏期;上第三系油气藏属于次生油气藏

它们主要是由于上新世以后因构造变动导致下第三系油气藏调整和破坏

油气发生向上再运移而聚集形成的。柴北缘油气藏形成演化过程中

断层始终扮演了重要的角色。

Abstract

Characteristics of hydrocarbon accumulation in typical oil and gas fields in the northern edge of Qaidam basin are analyzed by using homogenization temperature and compositions of inclusions and trap evolution history. Oil and gas in Jurassic reservoirs have been accumulated in 3 different stages

including the end of Jurassic

Oligocene and Pliocene; while that in the lower Tertiary reservoirs have been accumulated in 2 stages

i.e. Oligocene and Pliocene; and that in the upper Tertiary reservoirs are of secondary oil/gas reservoirs

accumulated through upward remigration of hydrocarbons from the adjustment and damage of the lower Tertiary reservoirs

due to post Pliocene tectonic movements. Faults have played a key role all the time during the formation and evolution of oil and gas reservoirs in the northern edge of Qaidam basin.