Complex gas water distribution law of the gas reservoir of the second member of Xujiahe Formation in Xinchang area, western Sichuan
Received date: 2023-10-07
Revised date: 2023-12-09
Online published: 2024-01-03
Supported by
The Project of the Ministry of Science and Technology of SINOPEC(P21040-1)
The gas water relationship in the second member of the Xujiahe Formation (Xu 2 Member) in the Xinchang structural belt of the Western Sichuan Depression is extremely complex, and has become one of the main factors restricting the efficient development of gas reservoirs. By analyzing the distribution characteristics of gas and water in the gas reservoir, the main controlling factors of the complex gas water relationship in the gas reservoir were studied from aspects such as structure, distribution of cap and barrier layers, reservoir characteristics, and oil and gas migration and accumulation patterns. The results show that horizontally, the tight gas reservoir of Xu 2 Member in Xinchang area is mainly affected by the strong heterogeneity of the reservoir. The connectivity between the reservoir and permeability bodies is poor, and local structural highs and fault fracture bodies are favorable locations for oil and gas accumulation. Vertically separated by regional caprocks and continuously distributed compartments, it is divided into two relatively independent gas-water systems: the upper and middle sub sections of Xu 2 Member. Due to the low porosity and permeability of the reservoir and poor pore structure, each gas-water system has a thick (25-170 m) gas-water transition zone. The strong heterogeneity of reservoirs, caprocks, and fractures have led to two types of gas water distribution patterns. The fracture transport pattern has a thick gas cap in the upper sub section of Xu 2 Member, and the bottom water is mainly distributed at the bottom of the middle sub section of Xu 2 Member. The source reservoir contact pattern presents the distribution characteristics of thin gas cap, thick gas water transition zone, and bottom water in each gas water system. The establishment of the gas water distribution model provides a basis for the water avoidance development of the gas reservoir, and points out that the preferred targets for development are relatively high structural areas, near hydrocarbon source faults, regional caprocks, and gas caps under the interlayer.
Jianmeng WU , Jianyun KANG , Xiangxi MIAO , Zhiwen WANG , Xiaoguang WU . Complex gas water distribution law of the gas reservoir of the second member of Xujiahe Formation in Xinchang area, western Sichuan[J]. Natural Gas Geoscience, 2024 , 35(7) : 1277 -1288 . DOI: 10.11764/j.issn.1672-1926.2023.12.010
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