昭通示范区太阳浅层页岩气田的勘探发现与评价探明创新实践认识  

Innovative practice and understanding of exploration,discovery and evaluation of Taiyang shallow shale gas field in Zhaotong Demonstration Area

作　　者：梁兴 王鹏万 罗瑀峰 李兆丰 袁晓俊 LIANG Xing;WANG Pengwan;LUO Yufeng;LI Zhaofeng;YUAN Xiaojun(PetroChina Zhejiang Oilfield Company;PetroChina Hangzhou Research Institute of Geology)

机构地区：[1]中国石油浙江油田公司 [2]中国石油杭州地质研究院

出　　处：《海相油气地质》2022年第2期113-123,共11页Marine Origin Petroleum Geology

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“浅层常压页岩气开发机理及开采工艺研究”(编号:kt2020-17-03);“十四五”前瞻性基础性科技项目“昭通浅层页岩气藏储层微观特征及富存机理研究”(编号:2021DJ1903)联合资助。

摘　　要：基于昭通示范区太阳浅层页岩气田勘探发现与评价的创新实践,系统总结了强改造复杂构造区的山地浅层页岩气田的基本地质特征和富集规律。太阳浅层页岩气田五峰组—龙马溪组龙一1亚段发育优质页岩,有机碳含量高,生烃潜力好。页岩储集条件优越,有机质纳米孔隙、脆性矿物粒间粒内孔隙与黏土矿物层间缝为页岩气提供大量储集空间。构造改造强度总体较弱,三维封存箱体系完整,整体保存条件良好,含气量较高,具有常压至微超压气藏系统。页岩脆性矿物含量高,背斜构造区水平应力差小,易于体积压裂改造。气田具有龙一11—龙一12下部和龙一13小层双靶体,可实施小井距立体错层体积开发。页岩气成藏赋存地质理论的创新认识与一体化地质工程技术的进步,是太阳浅层页岩气田勘探突破与高效评价的关键。太阳浅层页岩气田勘探的成功经验,对于中国南方复杂构造区浅层页岩气勘探具有重要的借鉴示范和指导意义。Based on the innovative practice of exploration,discovery and evaluation of Taiyang shallow shale gas field in Zhaotong Demonstration Area,the basic geological characteristics and enrichment law of mountainous shallow shale gas field in strong reconstruction and complex structural area are systematically summarized.It is pointed out that 30-40 m thick high-quality shale is developed in O3w(Wufeng Formation)-S1l11-1(first sublayer of Longmaxi Submember 11)of Taiyang shallow shale gas field.The geochemical characteristics show that the TOC of high-quality shale is generally greater than 2.0%,the type of organic matter is II1,and the macerals are mainly sapropelic.The maturity of organic matter(Ro)is among 1.65%-3.11%,with an average of 2.54%,belonging to the dry gas generation stage of over mature,which provides a good material basis for the generation of a large amount of shale gas.The reservoir conditions are superior,and various types of pores are developed,with porosity ranging from 2.04%to 10.06%.The pores dominated by organic matter pores and clay mineral interlayer fractures provide a large amount of reservoir space for shale gas.The gas content of the target layer generally increases with the increase of depth.The average adsorbed gas content of shale in O3w-S1l11-1 measured by methane adsorption experiment is 1.92 m3/t,which proves that the adsorbed gas accounts for a large proportion of shallow shale gas.Moreover,the trace strength of structural transformation is generally weak,which is conducive to the formation of a complete three dimensional sealed box system with the characteristics of roof and floor with good vertical sealing performance,reverse fault with good lateral sealing performance and shale reservoir with strong self-sealing performance.Therefore,the overall preservation conditions of the target layer are good,with high gas content and atmospheric pressure to micro overpressure system.Shale has high content of brittle minerals and small horizontal stress difference in anticline structure area

关 键 词：浅层页岩气 三维封存箱体系 立体错层体积开发 五峰组 龙马溪组一段1亚段 太阳气田 昭通示范区 

分 类 号：TE132.1[石油与天然气工程—油气勘探]