GROWTH THRUSTS AND OIL GENERATION,MIGRATION AND ACCUMULATION:TAKING GASI FAULT-SUBSIDENCE IN QAIDAM BASIN AS AN EXAMPLE

Zhou Huayao; Hu Wenyi

doi:10.11743/ogg19930304

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GROWTH THRUSTS AND OIL GENERATION,MIGRATION AND ACCUMULATION:TAKING GASI FAULT-SUBSIDENCE IN QAIDAM BASIN AS AN EXAMPLE
Vol. 14, Issue 3, Pages: 200-206(1993)
Online First：25 September 1993，

Published：1993
DOI： 10.11743/ogg19930304
稿件说明：

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DOI：

Zhou Huayao, Hu Wenyi. GROWTH THRUSTS AND OIL GENERATION,MIGRATION AND ACCUMULATION:TAKING GASI FAULT-SUBSIDENCE IN QAIDAM BASIN AS AN EXAMPLE[J]. 1993, 14(3): 200-206. DOI： 10.11743/ogg19930304.

摘要

尕斯断陷第三系由于生长逆断层发育

形成了以牵引背斜、生长背斜和断鼻构造为主要类型的圈闭。断层下盘生油岩比上盘的成熟度和转化率高、过剩孔隙流体压力大且储层物性优;断层又是油气运移的通道。生长逆断层为油气生、储、运、聚的良好配置提供了地质基础。

Abstract

Growth thrusts that were widespread in Tertiary deposits of Gasi fault subsidence in Qaidam Basin controlled the structural framework of the three main kinds of structures

and formed growth anticlines

drag anticlines and fault nozes.The tectonic evolution pro-cess could be divided into formation stage

growth stage and stagnation stage.As for the source rocks

that in the footwall of the thrust are characterized by high maturity and transformation ratio of organic matter

high oil saturation and excess pore-fluid pressures.The growth thrusts might act as the passage path for hydrocarbon migration.The growth structural traps derived from the thrusts generally have following favourable conditions:1.close to oil source

especially the growth anticlines which usually form hydrocarbon pools of lower formation generated-upper formation reserved type;2.long time and multi-stage of hydrocarbon supply due to early formed traps;3.abundance of oil source and multi-layer of oil supply.