山地煤层气勘探创新实践及有效开采关键技术--以四川盆地南部筠连煤层气田为例  

Exploration innovation practice and effective exploitation key technology of mountain coalbed methane--Taking the Junlian coalbed methane field in southern Sichuan Basin as an example

作　　者：梁兴 单长安 李兆丰 罗瑀峰 LIANG Xing;SHAN Chang'an;LI Zhaofeng;LUO Yufeng(PetroChina Zhejiang Oilfield Company,Hangzhou,Zhejiang 311100,China;School of Earth Sciences and Engineering,Xi'an Shiyou University,Xi'an,Shaanxi 710065,China)

机构地区：[1]中国石油浙江油田公司,浙江省311100 [2]西安石油大学地球科学与工程学院

出　　处：《天然气工业》2022年第6期107-129,共23页Natural Gas Industry

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目“煤层气新区新层系新领域战略与评价技术研究”(编号:2021DJ2303)。

摘　　要：四川盆地南部筠连山地煤层气田是中国南方首个具有商业开发价值的煤层气田,也是中国除沁水盆地和鄂尔多斯盆地东缘之外的第三个煤层气产业基地。为了给我国南方其他地区的煤层气勘探开发提供指导和借鉴,总结了该山地煤层气田的勘探历程及有效开采经验,归纳了其创新形成的地质勘探理论和开采关键技术。研究结果表明:①该煤层气田目前投产井已达450余口,已连续5年年产气量超过1×10^(8)m^(3),煤层气产自于上二叠统含煤岩系,证明了川南地区良好的煤层气勘探开发前景;②该区上二叠统发育30多套煤层,目前主力煤层气产层为C_(7)号、C_(8)号煤层,其合计厚度超过6 m;③煤层气储层平均孔隙度为5.33%,平均渗透率为5.057×10^(-3)mD,主要储集空间为微纳米级孔隙;④明确了构造—热演化、构造形迹、沉积环境、水文地质条件“四元控气”的山地煤层气成藏理论和“宽缓向斜富气”的煤层气成藏赋存模式,向斜核部的埋深大与压应力集中使得其煤储层吸附气量较构造两翼要高;⑤针对云贵川乌蒙山构造形态山地条件下的高煤阶、薄煤层、低渗透率煤层气地质特征,探索形成了适用于山地高煤阶煤层气勘探开发的五项综合评价方法与技术系列,包括构造改造型山地煤层气富气高产优选评价技术、地面地下一体化部署与滚动优化设计实施技术、工厂化优快高效钻完井技术、一体化体积压裂设计与工艺技术、数字智能化精细排采技术,并进行了工业化规模应用。结论认为,川南山地煤层气已经成功实现了规模有效开发和绿色清洁生产。Junlian mountain coalbed methane field in southern Sichuan Basin is the first coalbed methane field with commercial development value in south China,and it is also the third coalbed methane industrial base in China besides Qinshui Basin and eastern margin of Ordos Basin.In order to provide guidance and reference for the exploration and development of coalbed methane in other areas of southern China,the exploration history and effective development experience of the coalbed methane field in the mountainou area are summarized,and the geological exploration theory and key development technology innovatively formed are summarized.The results show that:①At present,more than 450 wells have been put into production in the coalbed methane field,and the annual gas output has exceeded 1×10^(8) m^(3) for 5 consecutive years.Coalbed methane is produced in the Upper Permian coal-bearing rock series;which has proved that there is a good prospect of coalbed methane exploration and development in southern Sichuan;②There are more than 30 sets of coal seams developed in the Upper Permian in this area.The main coalbed methane producing layers are C_(7) and C_(8),with a combined thickness of more than 6 m;③The average porosity and permeability of coalbed methane reservoir are 5.33%and 5.057×10^(-3) mD,and the main reservoir spaces are micro/nano pores;④The theory of coalbed methane accumulation in mountain area controlled by four elements of tectonic-thermal evolution,tectonic trace,sedimentary environment and hydrogeological conditions,and the model of coalbed methane accumulation with rich gas in wide and gentle syncline are defined.The large burial depth and compressive stress concentration in the syncline core make the adsorption gas of coal reservoir higher than that in the tectonic wing;⑤According to the geological characteristics of coalbed methane with high rank,thin seam and low permeability in Wumeng mountain,five comprehensive evaluation methods and technology series suitable for the exploration and developmen

关 键 词：四川盆地南部 筠连地区 山地煤层气 勘探开发一体化实践 气藏形成 有效开采 商业开发 

分 类 号：TE37[石油与天然气工程—油气田开发工程] P618.13[天文地球—矿床学]