蓬莱气区射洪—盐亭区块灯四段储集层构造裂缝预测

doi:10.7657/XJPG20250202

摘要/Abstract

摘要：

为确定四川盆地蓬莱气区射洪—盐亭区块灯影组灯四段储集层裂缝分布特征，在统计分析构造裂缝参数的基础上，基于岩石破裂准则、产状演化条件和现今应力场特征，通过构造应力场反演，对研究区灯四段超深碳酸盐岩储集层裂缝进行了定量预测。研究结果表明：灯四段构造剪切缝发育，斜交缝集中分布于东南构造高部位，高角度缝和直立缝多分布在断层附近，裂缝走向多为北西—南东向、北东—南西向和北北西—南南东向；裂缝线密度总体呈东南低、西北高的分布格局，裂缝开度分布则与之相反，裂缝孔隙度变化相对较小；裂缝参数特征在断层内部、断层附近及非断层部位具差异分布的特点，预测结果与实测结果基本一致。裂缝倾角、裂缝开度和孔隙度对气井产量影响显著。

关键词: 四川盆地, 蓬莱气区, 射洪, 盐亭, 灯影组, 灯四段, 力学模型, 构造裂缝

Abstract:

In order to determine the distribution of the fractures in the fourth member of the Dengying formation (Deng 4 member) in the Shehong-Yanting block of the Penglai gas field, Sichuan Basin, a statistical analysis was conducted on the structural fracture parameters. Based on rock rupture criteria, occurrence evolution conditions, and present-day stress field characteristics, a quantitative prediction of fractures in the ultra-deep carbonate reservoirs of the Deng 4 member were performed through tectonic stress field inversion. The results show that structural shear fractures are well developed in the Deng 4 member, oblique fractures are concentrated in the southeastern structural highs, while high-angle and vertical fractures are mostly distributed near faults. The fracture strikes are predominantly NW-SE, NE-SW and NNW-SSE. The linear density of fracture is generally low in the southeast and high in the northwest, while the fracture aperture shows an opposite distribution pattern. The fracture porosity reflects a relatively small variation. Fracture parameters exhibit different distribution characteristics within fault zones, near faults, and in non-fault areas, with the predicted results being largely consistent with the measured data. The fracture dip, aperture, and porosity significantly influence gas well productivity.

Key words: Sichuan Basin, Penglai gas field, Shehong, Yanting, Dengying formation, Deng 4 member, mechanical model, structural fracture

中图分类号:

TE122.1

李皋, 上官自然, 杨旭, 李红涛, 李泽, 王秋彤. 蓬莱气区射洪—盐亭区块灯四段储集层构造裂缝预测[J]. 新疆石油地质, 2025, 46(2): 136-143.

LI Gao, SHANGGUAN Ziran, YANG Xu, LI Hongtao, LI Ze, WANG Qiutong. Prediction of Structural Fractures in Deng 4 Member Reservoirs in the Shehong-Yanting Block, Penglai Gas Field, Sichuan Basin[J]. Xinjiang Petroleum Geology, 2025, 46(2): 136-143.

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地质力学单元	密度/ （g·cm^-3）	弹性模量/ GPa	泊松比	内聚力/ MPa	内摩擦角/ （°）
上覆地层	2.72	38	0.225	22	35
筇竹寺组	2.65	30	0.235	15	30
灯四段	2.78	55	0.230	38	40
基底	2.78	55	0.230	40	36
断层	2.58	33	0.250	28	30

井名	裂缝线密度/（条·m^-1）		裂缝开度/μm		裂缝孔隙度/%
井名	预测	实测	预测	实测	预测	实测
DB1井	0.81	0.89	9.93	14.56	0.002 1	0.001 8
PS15井	0.73	0.80	8.00	11.78	0.001 6	0.001 4
PS13井	0.86	0.81	6.95	8.89	0.002 2	0.001 9
PS6井	1.17	1.03	2.53	3.72	0.001 8	0.001 5