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Gas-Water Distributed Pattern in Xujiahe Formation Tight Gas  Sandstone Reservoir and Influential Factor in Central Sichuan Basin

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  • 1.State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249,China;
    2.Faculty of National Resource & Information Technology, China University of Petroleum, Beijing 102249, China;
    3.Langfang Branch, Research Institute of Petroleum Exploration and Development, CNPC, Langfang 065007,China

Received date: 2010-03-09

  Revised date: 2010-04-26

  Online published: 2010-06-10

Abstract

The research of the complex distribution of gas and water in the upper Triassic Xujiahe Formation of central Sichuan basin is important to the effective development of gas reservoir. Based on gas testing data, logging response and water saturation calculation for more than 80 wells in the 15 gas pools, we successfully used the high definition induction logging and movable water saturation to identify the gas or water layer. According to distribution gas and water of single well and cross section, we considered that there were many vertical gas-water systems in the Xujiahe Formation of central Sichuan basin, the movable water saturation gradually increased from top to bottom in a single gas-water system, suggesting gas accumulated at top and water did at bottom. Three gas-water distributed patterns are followed as: lithological pattern in T3x2 of Hechuan area, fractura-|lithological pattern in T3x4 of Chongxi area, and structura-|lithological pattern in T3x6 of Guang′an area, respectively. In combination with geological background, the distribution of gas and water in the Xujiahe Formation of central Sichuan basin was controlled by high-quality reservoir, including to connectivity of sand bodies, fracture and structure.

Cite this article

HAO Guo-Li, LIU Guang-Di, XIE Zeng-Ye, SUN Ming-Liang . Gas-Water Distributed Pattern in Xujiahe Formation Tight Gas  Sandstone Reservoir and Influential Factor in Central Sichuan Basin[J]. Natural Gas Geoscience, 2010 , 21(3) : 427 -434 . DOI: 10.11764/j.issn.1672-1926.2010.03.427

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