四川盆地西南部井研地区二叠系茅口组断溶体识别

doi:10.7657/XJPG20250503

摘要/Abstract

摘要：

针对四川盆地西南部井研地区二叠系茅口组断控型岩溶储集层分布不清的问题，利用钻井、地质、地震等资料，建立茅口组断层和断溶体地震识别模式，利用正演模拟技术分析两者地震反射的差异，在此基础上，利用相干、最大似然、倾角、梯度结构张量等地震结构属性识别多期次叠加断层，利用熵、能量等地震纹理属性识别层间断溶体，准确识别了茅口组断控型岩溶储集层的分布情况，并建立了地质发育模式。结果表明，研究区主要发育多期次叠加断层断溶体和层间断溶体2种断控型岩溶储集层，其中，多期次叠加断层断溶体主要发育在研究区南部，层间断溶体主要发育在研究区东部，地震结构属性对地震波形连续性差异变化明显的高陡、直立多期次叠加断层断溶体识别精度较高，地震纹理属性对地震波形反射振幅能量变化明显的平缓、低角度层间断溶体识别精度较高，预测结果与钻井结果吻合，研究结果可指导下一步勘探部署。

关键词: 四川盆地, 二叠系, 茅口组, 断控型岩溶储集层, 断溶体, 地震结构属性, 地震纹理属性

Abstract:

The distribution of fault-controlled karst reservoirs in the Permian Maokou formation in the Jingyan area of southwestern Sichuan Basin remains unclear. A seismic identification model for faults and fault-karst bodies in the Maokou formation was established using drilling, geological, seismic and other data. The differences in seismic reflections between faults and fault-karst bodies were analyzed through forward modelling. On this basis, multi-stage superimposed faults were identified using seismic structural attributes such as coherence, maximum likelihood, dip angle and gradient structure tensor etc., and interlayer fault-karst bodies were recognized from seismic texture attributes such as entropy and energy. Then the distribution of Maokou formation fault-controlled karst reservoirs was accurately determined, and a geological development model was established. The results indicate that the study area mainly develops two types of fault-controlled karst reservoirs: multi-stage superimposed fault-karst bodies, which are observed in the southern part of the study area, and interlayer fault-karst bodies, which are developed in the eastern part of the study area. The seismic structural attributes can be used to accurately recognize high, steep and upright multi-stage superimposed fault-karst bodies that exhibit significant differences in the continuity of seismic waveforms, while the seismic texture attributes can be used to accurately represent gentle and low-angle interbedded fault-karst bodies with obvious changes in reflection amplitude energy of seismic waveforms. The predicted results are consistent with actual drilling results, and the research results can guide the future exploration deployment.

Key words: Sichuan Basin, Permian, Maokou formation, fault-controlled karst reservoir, fault-karst body, seismic structural attribute, seismic texture attribute

中图分类号:

TE122.2

李素华, 卢齐军, 胡昊, 李蓉, 苏成鹏, 蒋能春. 四川盆地西南部井研地区二叠系茅口组断溶体识别[J]. 新疆石油地质, 2025, 46(5): 544-552.

LI Suhua, LU Qijun, HU Hao, LI Rong, SU Chengpeng, JIANG Nengchun. Identification of Fault-Karst Bodies in Permian Maokou Formation in Jingyan Area, Southwestern Sichuan Basin[J]. Xinjiang Petroleum Geology, 2025, 46(5): 544-552.

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