四川盆地南缘昭通示范区罗布向斜志留系龙马溪组页岩储层裂缝建模  

Fracture modeling of shale reservoirs of Silurian Longmaxi Formation in Luobu syncline in Zhaotong National Shale Gas Demonstration Area,southern margin of Sichuan Basin

作　　者：计玉冰 郭冰如 梅珏 尹志军[2] 邹辰 JI Yubing;GUO Bingru;MEI Jue;YIN Zhijun;ZOU Chen(Integration Center of Exploration&Development,PetroChina Zhejiang Oilfield Company,Hangzhou 310023,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中国石油浙江油田公司勘探开发一体化中心,杭州310023 [2]中国石油大学(北京)地球科学学院,北京102249

出　　处：《岩性油气藏》2024年第3期137-145,共9页Lithologic Reservoirs

基　　金：国家科技重大专项“昭通页岩气勘探开发示范工程”(编号:2017ZX05063);中国石油天然气集团有限公司重大现场试验项目“深层页岩气有效开采关键技术攻关与试验”(编号:2019F-13)联合资助。

摘　　要：基于岩心分析、成像测井分析和三维地震资料,对四川盆地南缘昭通示范区罗布向斜龙一1亚段和五峰组的多尺度离散裂缝网络建模方法进行了研究。研究结果表明:(1)将蚂蚁体属性中的强响应部分确定性提取成面,可得到大尺度离散裂缝网络模型;用蚂蚁体沿层切片显示的带走向趋势的裂缝参与小尺度离散裂缝网络建模,降低了小尺度裂缝走向模拟的不确定性。(2)罗布向斜龙一1亚段和五峰组裂缝以高角度剪切缝为主,多被方解石充填,裂缝走向为北东—南西向,成像测井解释的裂缝走向与附近地震解释的断层走向一致。(3)大尺度离散裂缝网络模型与钻井的断层位置相符,小尺度裂缝发育部位与钻井液漏失部位吻合,多尺度离散裂缝网络模型可较好地表征罗布向斜龙一1亚段和五峰组的裂缝发育特征。(4)罗布向斜Y12H井应用多尺度离散裂缝网络模型优化压裂方案,压裂缝网复杂度高,试气产量较邻井提高了近41%,优化小尺度裂缝走向后的多尺度离散裂缝网络模型实际应用效果较好。Based on core analysis,imaging logging analysis and 3D seismic data,a multi-scale discrete fracture network modeling method was studied for Long-1 submember of Longmaxi Formation and Wufeng Formation in Luobu syncline in Zhaotong National Shale Gas Demonstration Area,southern margin of Sichuan Basin.The results show that:(1)Extracting the strong response part of ant tracking attributes as a surface can obtain a large-scale discrete fracture network model.Small scale fracture modeling can be established using the random discrete fracture network modeling method,which uses the trend of the fracture band shown by ant tracking properties along the layer slice,which reduces the uncertainty of small-scale fracture simulation.(2)The fractures of Long-1 submember of Longmaxi Formation and Wufeng Formation in Luobu syncline are mainly high angle shear fractures,mostly filled with calcite.The main direction of the fractures is northeast southwest,and the fracture direction explained by imaging logging is consistent with the fault direction explained by nearby seismic interpretation.(3)The large-scale discrete fracture network model is consistent with the fault location of the drilling,and the development of small-scale fractures is consistent with the leakage of drilling fluid,indicating that the multi-scale discrete fracture network model can better represent the fracture development characteristics of Long-1 submember of Longmaxi Formation and Wufeng Formation in Luobu syncline.(4)The multi-scale discrete fracture network model was applied to optimize the hydraulic fracturing scheme for well Y12H in Luobu syncline,resulting in a high complexity of hydraulic fracturing network and nearly 41%increase in gas production compared to adjacent wells.The multi-scale discrete fracture network model after optimizing the small-scale fracture orientation has a good practical application effect.

关 键 词：多尺度裂缝建模 离散裂缝网络模型 蚂蚁体 页岩储层 龙马溪组 志留系 罗布向斜 昭通示范区 四川盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]