四川盆地涪陵页岩气田单井可压性地质因素研究  

Geological factors of well fracability in Fuling shale gas field,Sichuan Basin

作　　者：胡德高[1] 刘超[2] HU Degao;LIU Chao(SINOPEC Jianghan,Oilfield Company,Qianjiang,Hubei 433124,China;Research Institute of Petroleum,Exploration and Development,SINOPEC Jianghan,Oilfield Company,Wuhan,Hubei 430223,China)

机构地区：[1]中国石化江汉油田分公司,湖北潜江433124 [2]中国石化江汉油田分公司勘探开发研究院,武汉430223

出　　处：《石油实验地质》2018年第1期20-24,共5页Petroleum Geology & Experiment

基　　金：国家科技重大专项(2016ZX05060);中国石化科技项目(P17014-2)资助

摘　　要：页岩储层的脆性矿物含量、脆性指数、水平应力差异系数等是影响页岩可压性的主要因素,而四川盆地涪陵页岩气田五峰组—龙马溪组一段(1)^(5)小层页岩储层的脆性矿物含量(>50%)、脆性指数(>50%)、水平差应力差异系数(<0.2)等基本相似,因此,利用上述参数无法有效评价该区块单井的可压性。根据涪陵页岩气田大量已钻单井资料,从埋深、构造形态、裂缝发育特征等地质因素出发,评估了各地质因素对单井可压性的影响。结果表明:(1)埋深是影响单井可压性最重要的地质因素,埋深越大,储层压裂难度越大;(2)构造形态会对压裂产生较为明显的影响,负向构造形态压裂难度大于正向构造;(3)天然裂缝发育的非均质性也会导致压裂难度增大,缝网延伸困难,影响储层改造效果,降低单井产能。Brittle mineral content,brittle index and horizontal stress difference coefficient ol shale reservoirs are the main factors influencing shale fracability.The①一⑤layers from the Wuieng Formation to the first member oi Longmaxi Formation in the Fuling shale gas field have similar brittle mineral content(>50%),brittle index(>5 0%),and horizontal stress difference coefficient(<0.2).Therefore,the above parameters can not be used effectively to evaluate the fracability of a single well in this block.Based on a large amount of single well data,the authors assessed the influence of various geological factors on the fracability of a single well by geological factors such as burial depth,structural form and fracture development characteristics.The results showed that:(1)Burial depth is the most important geological factor affecting single well fracability,and the greater the burial depth,the greater the difficulty of reservoir fracturing;(2)Structural morphology has a more obvious effect on fracturing,and fracturing is more difficult in negative structures than in positive ones;(3)The heterogeneity of natural fractures will also lead to the increased difficulty of fracturing,the difficulty of extending seam networks,affecting the effect of reservoir reconstruction and reducing the productivity of a single well.

关 键 词：可压性 构造形态 裂缝 页岩储层 涪陵页岩气田 四川盆地 

分 类 号：TE311[石油与天然气工程—油气田开发工程]