川南YJ向斜区茅口组储层地震预测与主控因素分析

Reservoir seismic prediction and main controlling factors analysis of Maokou Formation in YJ Syncline area, South Sichuan Basin

杨柳 巫芙蓉 郭鸿喜 耿超 范昆 何小会1

中国石油东方地球物理公司西南物探研究院，四川 成都 610213 中国石油西南油气田分公司勘探事业部，四川 成都 610041 中国石油西南油气田分公司蜀南气矿，四川 泸州 646000

Southwest Geophysical Research Institute, BGP Inc., CNPC, Chengdu 610213, China Exploration Division, Southwest Oil & Gas Field Company, PetroChina, Chengdu 610041, China Shunan Gas Mine, Southwest Oil & Gas Field Company, PetroChina, Luzhou 646000, China

川南YJ向斜区YJ2井在茅口组钻遇石灰岩岩溶储层，测试获高产工业气流，日产量为58.8×10４ m3，展现出川南向斜区茅口组岩溶储层巨大的勘探潜力。文中基于YJ向斜区高品质三维地震资料和典型新老钻井井震标定，结合模型正演，研究了茅口组内幕岩溶储层和表层岩溶储层的地震响应特征；优选均方根振幅地震属性，预测了内幕岩溶储层和表层岩溶储层的分布。研究表明，茅口组储层的主控因素为颗粒滩相沉积、东吴期岩溶改造和燕山—喜山期构造裂缝。研究成果为川南地区茅口组拓展勘探领域提供了重要支撑。

Well YJ2 drilled in the area of YJ Syncline in South Sichuan Basin encountered limestone karst reservoir in Maokou Formation, and obtained high-yield industrial gas flow of 588,000 m3/d during the test, showing the huge exploration potential of karst reservoir of Maokou Formation in South Sichuan Syncline area. Based on the high-quality 3D seismic data and the well-seismic synthesis record calibration of typical new and old wells in YJ Syncline area, combined with the forward modeling, the seismic response characteristics of the inside and the surface karst reservoir of Maokou Formation are studied. The distribution characteristics of the surface and the inside karst reservoir are predicted by optimizing the seismic attribute of RMS amplitude. The study shows that the reservoir of Maokou Formation should be controlled mainly by grain beach facies deposition, karst transformation in the period of Dongwu and structural fracture in the Yanshanian-Himalayan period, which provides an important support for the exploration of Maokou Formation in South Sichuan Basin.

10.6056/dkyqt202103014