陆相页岩气成藏地质条件及富集高产主控因素分析——以元坝地区为例  

Geologic condition of shale gas accumulation in continental facies and main controlling factors of enrichment and high production:Taking Yuanba District as an example

作　　者：王庆波[1] 刘若冰[1] 魏祥峰[1] 倪楷[1] 高红贤[1] 

机构地区：[1]中国石化勘探南方分公司,四川成都610041

出　　处：《断块油气田》2013年第6期698-703,共6页Fault-Block Oil & Gas Field

基　　金：国土资源部油气战略研究中心全国页岩气资源潜力调查评价及有利区优选项目"四川盆地侏罗系;兰坪-思茅盆地;松潘阿坝地区页岩气资源调查评价与选区"(2009GYXQ15-06)

摘　　要：元坝地区在下侏罗统泥页岩层段获得高产页岩油气流。其中,千佛崖组页岩气水平井产量稳定,油气并产;自流井组大安寨段直井常规测试单井气产量最高达21×104m3/d。文中通过分析总结元坝陆相页岩气特点和勘探开发成果认为:元坝地区泥页岩主要发育在浅湖、半深湖沉积相带,具有厚度大、有机质丰度高、有机质类型好、热演化程度适中、储集物性及含气性好,以及可压性等特点,具备陆相页岩气形成的有利地质条件;沉积相带控制了富有机质泥页岩的空间展布,岩相控制了物性特征及可压裂性,裂缝和超压控制了页岩气的高产。同时,初步建立了陆相页岩气有利区选区标准:半深湖—浅湖相带,暗色泥页岩累计厚度不小于30 m,TOC不小于1%,Ro不小于1.1%,孔隙度不小于2%,含气量不小于0.5 m3/t,埋深在500～4 200 m,裂缝发育,地层压力系数不小于1.3。High shale oil and gas flows are found in Lower Jurassic shale interval in Yuanba District. Gas production of horizontal well with shale gas in Qianfuya Formation is stable with oil and gas. The production of vertical well in Ziliujing Formation Daanzhai interval is up to 21×104 m3/d. This paper analyzes shale gas characteristics and exploration achievements. It is considered that the shale in Yuanba District is mostly developed in shallow lake and semi-deep lake sedimentary facies belts and has the characteristics of large thickness, high abundance of organic matter, good type of organic mattel, moderate thermal evolution degree, good reservoir properties, good gas bearing property and compressibility, which are good conditions of shale gas accumulation and development in this area. Sedimentary facies control the distribution of organic-rich shale. Lithofacies control the physical properties and compressibility. Fracture and overpressure control high production of shale gas. The standard of favorable area for continental facies shale gas is established, wiuch are semi-deep to lake-shallow sedimentary facies belt, dark shale thickness is not less than 30 m, TOC is not less than 1%, R1, is not less than 1.1%, porosity is not less than 2%, gas content is not less than 0.5 m3/t. Depth is from 500 to 4,200 m with fractures. Formation pressure coefficient is not less than 1.3.

关 键 词：陆相页岩气 富集高产 主控因素 有利区标准 元坝地区 

分 类 号：TE122.11[石油与天然气工程—油气勘探]