川西坳陷须家河组二段断缝型气藏产水模式

doi:10.7657/XJPG20250506

摘要/Abstract

摘要：

四川盆地川西坳陷上三叠统须家河组二段气藏属于典型断缝体致密砂岩气藏，断缝体内天然裂缝发育，缝网连通性强，气井虽然初期产量较高，但普遍受水侵影响，难以维持稳产。为明确气井出水原因，确定水侵路径、规模和见水时间，依据产量、压力等动态特征进行气井分类，结合气水分布及储集层裂缝特征，归纳产水模式，建立能够反映产水模式的数值模拟模型；依据数值模拟结果，建立不同产水模式的判别标准，并利用气井水分析资料验证数值模拟结果的正确性。

关键词: 四川盆地, 川西坳陷, 上三叠统, 须家河组, 致密砂岩, 天然气藏, 产水模式, 数值模拟

Abstract:

In the western Sichuan depression of Sichuan Basin, the gas reservoir in the second member of Xujiahe formation (Xu-2 member) is a typical fault-fracture tight sandstone gas reservoir. Natural fractures are well developed in the reservoir, with a strong connectivity. The gas wells initially produce at high rates, but cannot maintain stable yield due to water invasion. To identify the causes of water production and determine the water invasion pathway, scale, and timing, gas wells were classified depending on their dynamic characteristics such as production rate and pressure. By analyzing the distribution of gas and water and the fracture characteristics of the reservoir, water invasion patterns were identified, and a numerical simulation model which can reflect these patterns was established. Based on the results of the numerical simulation, criteria for determining water invasion patterns were established, and the simulation results were verified using water analysis data from gas wells.

Key words: Sichuan Basin, Western Sichuan depression, Upper Triassic, Xujiahe formation, tight sandstone, gas reservoir, water invasion pattern, numerical simulation

中图分类号:

TE112.23

徐中一, 郭艳东, 毕有益, 赵向原, 史海涛, 刘露, 糜利栋. 川西坳陷须家河组二段断缝型气藏产水模式[J]. 新疆石油地质, 2025, 46(5): 567-574.

XU Zhongyi, GUO Yandong, BI Youyi, ZHAO Xiangyuan, SHI Haitao, LIU Lu, MI Lidong. Water Production Patterns of Fault-Fracture Gas Reservoir in Xu-2 Member in Western Sichuan Depression[J]. Xinjiang Petroleum Geology, 2025, 46(5): 567-574.

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模型	裂缝密度/（条·m^-1）	裂缝开度/m	裂缝孔隙度	x方向渗透率/mD	y方向渗透率/mD	z方向渗透率/mD
低角度缝模型	2	7.5×10^-5	1.21×10^-6	0.559	0.558	0.019
网状缝模型	2	7.5×10^-5	1.21×10^-6	0.559	0.274	0.303
高角度缝模型	2	7.5×10^-5	1.21×10^-6	0.561	0.018	0.558