Gas Exploration Potential of the 1st, 3rd and 5th Members of Xujiahe Formation Reservoirs in the Sichuan Basin
详细信息
- 责任者：Zhao Zhengwang (Exploration and Development Research Institute ; Southwest Oil and Gasfield Company ; PetroChina ; Chengdu 610041 ; China) ; Xie Jirong
- 刊名：Natural Gas Industry
- 出版年：2013
- 卷期：33(6)
- 关键词：天然气 ; natural gas ; 油气勘探 ; petroleum exploration ; 四川盆地 ; Sichuan Basin
- 页码：p.23-28
- 图表：illus., 16 refs.
- 分类号：1003
- issnNo：ISSN1000-0976
- isbnNo：CN51-1179/TE
摘要
Since the 1st,3rd and 5th members of Upper Triassic Xujiahe Fm in the Sichuan Basin were previously regarded as the major source rocks of the reservoirs in the 2nd,4th and 6th members of Xujiahe Fm,petroleum exploration in these source rock intervals has not attracted much attention,leading to a low level of exploration maturity.However,recent drilling reveals rich gas shows in these 3 intervals and industrial gas flows are obtained in some wells.This paper analyzed the exploration potential of these three source rock intervals in the respect of their stratigraphic features,sedimentary facies and hydrocarbon migration and accumulation conditions.The following conclusions are obtained.(1) The favorable sedimentary facies belts of these source rock intervals mainly occur in the marginal area of this basin adjacent to the provenance where sedimentary microfacies such as delta front underwater distributary channel,mouth bar and sheet sands are developed.(2) These 3 members also contain tight sand reservoirs with low porosity and permeability,but with some areas having relatively high porosity,such as the 3rd member of Xujiahe Fm in the Zhongba area with a maximum porosity up to 13%.The favorable reservoirs are mainly distributed in the west and the western Middle Sichuan Basin where the maximum thickness of reservoirs is up to 30 m.(3) Indigenous gas reservoirs are developed in these 3 source rock intervals with a total generated gas volume of 258.23 trillion m3.The resource potential is large and the migration and accumulation conditions are favorable.Therefore,the 1st,3rd and 5th members of Xujiahe Fm have a fairly good gas exploration potential,and the play fairways are mainly distributed in the northwestern,southwestern and western middle parts of the Sichuan Basin.
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