川西彭州地区雷四段储集层构造裂缝特征及定量预测

doi:10.7657/XJPG20220503

摘要/Abstract

摘要：

川西彭州地区雷四段储集层构造裂缝发育,但其分布特征不清楚,严重影响雷四段天然气的高效开发。利用露头、岩心和岩石薄片观测,描述了储集层构造裂缝的发育特征,采用有限元方法模拟了喜马拉雅运动期的构造应力场,基于岩石破裂准则和弹性应变能预测了雷四段储集层构造裂缝的发育情况。结果表明,储集层构造裂缝以剪切裂缝为主,裂缝走向主要为北东—南西向、北西—南东向、近南北向和近东西向,裂缝延伸长度主要为10~70 m,构造裂缝密度主要为5~10条/m,喜马拉雅运动期生成的裂缝大都未被充填。喜马拉雅运动期雷四段最小水平主应力、最大水平主应力以及差应力分别为72.30~106.50 MPa、126.00~183.47 MPa和48.51~92.46 MPa。研究区断裂带预测构造裂缝密度远超过15条/m,雷四段预测构造裂缝密度主要为5~11条/m,背斜高部位的构造裂缝密度较两翼低,说明研究区裂缝的分布同时受构造位置和断层的控制。构造裂缝密度预测结果与实测结果的相对误差为4.2%~10.7%,预测结果可靠,为彭州地区雷四段碳酸盐岩气藏的勘探开发提供了地质依据。

关键词: 四川盆地, 彭州地区, 雷口坡组, 构造裂缝, 裂缝特征, 定量预测, 裂缝密度

Abstract:

Structural fractures are found in the Lei4 member reservoir in Pengzhou area, western Sichuan basin. However, their distribution characteristics are unclear, which seriously affects the efficient development of natural gas in the Lei4 member. Through outcrop, core and rock thin section observations, the development characteristics of the structural fractures in the reservoir were described. The tectonic stress field during the Himalayan movement was simulated with the finite element method. Based on the rock failure criterion and elastic strain energy, the development of the structural fractures in the Lei4 member reservoir was predicted. The results show that the structural fractures in the Lei4 member reservoir are dominantly shear fractures with the extension ranging from 10 m to 70 m and the density of 5-10 fractures/m, mainly trending in NE-SW, NW-SE, nearly S-N and nearly E-W. Most of the fractures generated during the Himalayan movement are not filled. The minimum horizontal principal stress, maximum horizontal principal stress and differential stress of the Lei4 member during the Himalayan movement were 72.30-106.50 MPa, 126.00-183.47 MPa and 48.51-92.46 MPa, respectively. The predicted structural fracture density in the fault zone of the study area is far more than 15 fractures per meter, mainly 5-11 fractures/m in the Lei4 member. The fracture density in the high part of the anticline is lower than that in the two flanks, indicating that the distribution of fractures in the study area is controlled by both fault and structural position. The relative error between the predicted and measured structural fracture densities is 4.2%-10.7%, suggesting reliable predicted results, which provide a geological basis for the exploration and development of carbonate gas reservoirs in the Lei4 member in Pengzhou area.

Key words: Sichuan basin, Pengzhou area, Leikoupo formation, structural fracture, fracture characteristic, quantitative prediction, fracture density

中图分类号:

TE122.21

谢强, 李皋, 彭红利, 何龙, 龚汉渤. 川西彭州地区雷四段储集层构造裂缝特征及定量预测[J]. 新疆石油地质, 2022, 43(5): 519-525.

XIE Qiang, LI Gao, PENG Hongli, HE Long, GONG Hanbo. Characteristics and Quantitative Prediction of Structural Fractures in Lei4 Member Reservoir in Pengzhou Area, Western Sichuan Basin[J]. Xinjiang Petroleum Geology, 2022, 43(5): 519-525.

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