延川南区块煤层气储层垂向非均质性特征及意义  

The Features and Meanings of Vertical Heterogeneity of Coalbed Methane Reservoir in Yanchuannan Block

作　　者：郑欢[1] 许晓宏[1] 王则 胡佳杰 雷琳 林燕[4] Zhenghuan;Xuxiaohong;Wang Ze;Hu Jiajie;Leilin;Linyan(School of Earth Sciences,Yangtze University,Wuhan,Hubei,430100,China;China University Of Petroleum(Beijing),Beijing,102249,China;Changqing Oilfield Company,PetroChina,Yan’an,Shaanxi,710021,China;Laojunmiao Production Plant,Yumen Oilfield Compamy,Gansu Province,jiuquan city,735019)

机构地区：[1]长江大学地球科学学院,湖北武汉430100 [2]中国石油大学(北京),北京102249 [3]长庆石油分公司第八采油厂,陕西西安710021 [4]玉门油田分公司老君庙采油厂,甘肃酒泉市35019

出　　处：《新疆地质》2019年第4期555-559,共5页Xinjiang Geology

基　　金：国家科技重大专项课题四“非均值陆相页岩气储层压裂改造配套工艺技术”（2017ZX05039-004)资助

摘　　要：为搞清延川南区块储层垂向非均质性特征及对煤层气开发的影响,基于延川南区块2#煤层取心资料和生产数据,采用室内实验和数据统计分析方法,研究了煤层组分、含气量及吸附时间、裂缝发育程度及煤体结构等参数的垂向非均质性及其对煤层气开发的影响。结果表明:2#煤层煤岩组分具垂向非均质性,其中挥发分和灰分垂向非均质性最强;煤层含气量、甲烷吸附时间及解吸速率垂向非均质性强,且吸附时间与解吸速率成正比,与含气量成反比,部分小层含气量相对较高、吸附时间短、解吸速率快,为优质储层。煤层裂缝渗透性具有明显垂向非均质性,渗透率指数能够有效表征裂缝渗透性强弱,裂缝渗透指数高于100时为相对高渗层,相对高渗层连续分布能够实现煤层气井高产。煤层煤体结构垂向非均质性较强,不同煤体结构煤厚度占比差异导致煤层整体力学参数差异,碎粒煤和糜棱煤厚度之和占比越大,煤层压裂缝半长越短。In order to figure out the vertical heterogeneityof coalbed methane(CBM)reservoir andit’s effects on the development of CBM in Yanchuannan Block,the vertical heterogeneity features of coal seam components,air content,adsorption time,fracture development degree and the coal body structure of and its impact on coalbed methane developmentare studied by experiments and data statistics,based on core testing and production dataof 2#coal seam in Yanchuannan Block,the results showed that 2#coal seam in industrial analysis of coal and rock composition and the maceral with vertical heterogeneity,including volatile and strongest ash vertical heterogeneity;Coal seam has strong vertical heterogeneity in gas content,methane adsorption time and desorption rate,and the adsorption time is directly proportional to the desorption rate and inversely proportional to the gas content.Some small layers have relatively high gas content,short adsorption time and fast desorption rate,which are high-quality reservoirs.The fracture permeability of coal seam has obvious vertical heterogeneity,and the permeability index can effectively characterize the strength and weakness of fracture permeability.When the fracture permeability index is higher than 100,it is a relatively high permeability layer,and the continuous distribution of relatively high permeability layer can achieve high production of coalbed gas Wells.The vertical heterogeneity of coal structure of coal seam is strong,and the difference of coal thickness proportion of different coal structure leads to the difference of overall mechanical parameters of coal seam.

关 键 词：延川南区块 煤层气 垂向 非均质性 储层评价 

分 类 号：P618.11[天文地球—矿床学]