Factors Controlling Gas-Water Contact and the Exploration Potential of the Xujiahe Formation Gas Reservoirs in the Xiaoquan-Fenggu Structural Zone, Sichuan Basin
详细信息
- 责任者：Liu Liping (Exploration and Development Research Institute ; Southwest Branch Company ; SINOPEC ; Chengdu 610041 ; China) ; Lin Xiaobing
- 刊名：Natural Gas Industry
- 出版年：2013
- 卷期：33(6)
- 关键词：气藏 ; gas reservoirs ; 油气勘探 ; petroleum exploration ; 四川盆地 ; Sichuan Basin
- 页码：p.16-22
- 图表：illus., 1 table, 18 refs.
- 分类号：1003
- issnNo：ISSN1000-0976
- isbnNo：CN51-1179/TE
摘要
The Xiaoquan-Fenggu structural zone is located in the central section of Western Sichuan Depression.Gas,water and dry layers coexist in the Upper Triassic Xujiahe Fm in this structural zone and the gas-water contract is very complex.In order to make clear the factors controlling gas-water contact in the Xujiahe Fm gas reservoirs,the produced water analysis results obtained over the years were integrated with the dynamic production performance data to study the characteristics of formation water.It is believed that the produced water during drilling operation and production is a mixture of condensate water and formation water.The production of condensate water is closely related with gas reservoir abundance.The Nvok phase diagrams were used to analyze the factors controlling gas-water contract.The following conclusions were obtained.(1) Edge water and bottom water coexist in a single local structure in the Xujiahe Fm gas reservoir.The lateral continuity of formation water is poor and its areal distribution is limited.Each local structure has a separate gas-water system.(2) Both the ancient and modern structural highs are favorable for the degassing and accumulation of water-dissolved gas.However,the palaeo-structure of reserv for oiring stage plays a decisive role.(3) Such areas with high formation water salinity and low formation pressure are more favorable the accumulation of free gas.Finally,the exploration potential of the 2nd and 4th members of Xujiahe Fm was analyzed.It is believed that free gas and dissolved gas coexist there,but in the 2nd member of Xujiahe Fm the degassing degree of water soluble gas is relatively higher,and this brings about a higher exploration potential there.Rational utilization and recovery of water dissolved gas is favorable for enlarging the scale of a gas reservoir.
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