永川地区深层页岩气储层不同尺度裂缝精细建模  

Fine modeling of fractures with different scales in deep shale gas reservoirs in Yongchuan area

作　　者：葛勋 郭彤楼[4] 黎茂稳 赵培荣[5] 范宏娟 王鹏 李王鹏[1,2,3] 钟城 GE Xun;GUO Tonglou;LI Maowen;ZHAO Peirong;FAN Hongjuan;WANG Peng;LI Wangpeng;ZHONG Cheng(State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Beijing 102206,China;Sinopec Key Laboratory of Shale Oil and Gas Exploration&Production,Beijing 102206,China;Sinopec Petroleum Exploration and Production Research Institute,Beijing 102206,China;Sinopec Southwest Oil and Gas Company,Chengdu 610041,China;China Petrochemical Corporation,Beijing 100728,China;Exploration and Development Research Institute of Sinopec Southwest Oil and Gas Company,Chengdu 610041,China;School of Earth Sciences and Engineering,Nanjing University,Nanjing 210033,China)

机构地区：[1]页岩油气富集机理与高效开发国家重点实验室,北京102206 [2]中国石化页岩油气勘探开发重点实验室,北京102206 [3]中国石化石油勘探开发研究院,北京102206 [4]中国石化西南油气分公司,四川成都610041 [5]中国石油化工集团有限公司,北京100728 [6]中国石化西南油气分公司勘探开发研究院,四川成都610041 [7]南京大学地球科学与工程学院,江苏南京210033

出　　处：《大庆石油地质与开发》2023年第6期1-8,共8页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家自然科学基金企业创新发展联合基金项目“深层海相油气富集机理与关键工程技术基础研究”(U19B6003)。

摘　　要：目前已有关于裂缝的研究主要是地震单属性预测,裂缝预测的精度较低。为了进一步提高压裂改造水平与页岩气井产能,需对页岩储层不同尺度的裂缝进行预测,尤其是对小尺度裂缝进行精细预测。利用相干、曲率、蚂蚁体3种地震属性对永川地区龙马溪组一段的天然裂缝进行定量预测,并针对不同尺度裂缝进行多属性裂缝综合建模。结果表明:永川地区裂缝分为3个等级,断距大于100 m的大尺度裂缝、断距50~100 m的中尺度裂缝和断距小于50 m的小尺度裂缝,相干、曲率、蚂蚁体属性预测结果大体一致,整体上断层走向以NE—SW为主,大尺度裂缝主要发育在新店子背斜附近,蚂蚁体可以更清晰地刻画出小尺度裂缝。裂缝综合建模显示,永川地区深层页岩气储层总体裂缝发育程度由好到差依次为新店子背斜主体、南部向斜、北区向斜,南部向斜微裂缝最发育,有利于压裂改造,因此将永川南部作为首要滚动产建目标区,气井试采效果好,测试产量整体高于永川中、北区。研究成果对于实现永川地区页岩气增储上产具有一定的指导意义。Existing study of fractures is mainly single attribute seismic prediction with low fracture prediction accuracy.In order to further improve fracturing stimulation level and shale gas wells productivity,the prediction of fractures with different scales in shale reservoirs is necessary,especially fine prediction of small-scale fractures.By using 3 seismic attributes of coherence,curvature and ant body,natural fractures in Long-1 Member of Longmaxi Formation in Yongchuan area are quantitatively predicted and multi-attributes comprehensive modeling is carried out for fractures with different scales.The results show that fractures in Yongchuan area are divided into 3 grades:largescale fracture with fault throw>100 m,medium-scale fracture with fault throw of 50~100 m,and small-scale fracture with fault throw<50 m.Attributes prediction of coherence,curvature and ant body have similar results,showing NE-SW dominant fault strike,with large-scale fractures mainly developed near Xindianzi anticline.Small-scale fractures are characterized more clearly by ant body.Comprehensive fracture modeling shows that overall fracture development degree of deep shale gas reservoirs in Yongchuan area is descendingly main body of Xindianzi anticline,southern syncline,northern syncline,with micro-fractures in southern syncline most developed,which is beneficial to fracturing stimulation.Therefore,taking southern Yongchuan area as primary progressive productivity construction target area,gas wells get higher tested production than that in middle and northern Yongchuan area.The research provides guiding significance for increasing shale gas production in Yongchuan area.

关 键 词：深层页岩气田 天然裂缝 裂缝建模 龙马溪组一段 永川地区 

分 类 号：TE122[石油与天然气工程—油气勘探] P631[天文地球—地质矿产勘探]