Geological Conditions and Pooling Process of High-Temperature and Overpressure Natural Gas Reservoirs in the Yinggehai Basin
详细信息
- 责任者：Xie Yuhong (Zhanjiang Branch ; China Co. ; CNOOC ; Zhanjiang 524057 ; China) ; Liu Ping1
- 刊名：Natural Gas Industry
- 出版年：2012
- 卷期：32(4)
- 关键词：天然气 ; natural gas ; 油气藏形成 ; reservoir formation ; 莺歌海盆地 ; Yinggehai Basin
- 页码：p.19-23
- 图表：2 illus., 7 refs.
- 分类号：1003
- issnNo：ISSN1000-0976
- isbnNo：CN51-1179/TE
摘要
With the breakthrough made in gas exploration in the high temperature and over-pressured environment of the Yinggehai Basin,this area has thus become the hot spot in present gas exploration.However,there are many uncertainties about the gas pooling patterns there.In view of this,through the analysis of geological conditions and gas pooling process in this area,the main controlling factors of free gas pooling in such high temperature and over-pressured environment of this basin are clarified.The following results are achieved in this study.(1) The hydrocarbon kitchen had a wide area with good quality source rocks,hydrocarbon generation took a long time,and there was a long lag in the time of hydrocarbon expulsion.(2) Such high temperature and over-pressured environment is good for the reservoirs to keep a rather high porosity and permeability.(3) Under closed and half-closed fluid system for a long time in this basin,multiple sealing rocks are well developed and favorable for gas accumulation and preservation.(4) In those half-closed high temperature and over-pressured fluid system in the diapiric structural zones of the middle and deep basin,water-soluble gas migrates,releases,and accumulates,as a result,a gas pool has come into being.Such evidences have been found in several water-soluble gas reservoirs in this basin.This study provides guidance for further gas exploration in the Yinggehai Basin.
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