延川南煤层气田富集稳产储层特征  

Characteristics of Rich and Stable Coalbed Methane Reservoirs in South Yanchuan

作　　者：曾凡武[1] ZENG Fanwu(Research Institute of Petroleum Exploration and Development,Sinopec East China Oil&Gas Company,Jiangsu 225007)

机构地区：[1]中国石化华东油气分公司石油勘探开发研究院,江苏225007

出　　处：《中国煤层气》2022年第1期13-17,共5页China Coalbed Methane

摘　　要：通过对探井储层煤岩进行煤体结构分析,镜质体反射率、显微组分、等温吸附、孔径分布、力学性质测试和扫描电镜观察等实验技术手段,分析煤层气富集稳产储层特征,探讨优质煤储层评价标准。研究结果表明:(1)煤层厚度大于4M,镜质体反射率为2%~3%,含气量大于10m;/t,生烃条件较好;(2)煤层埋深在1200m左右,储层压力在9.3MPa左右,过渡孔、微孔大于60%,顶底板为泥质岩性,厚度大于2.5m,储气条件更有利;(3)储层以原生结构煤和碎裂煤主,裂隙发育,储层渗透率高于0.30md,杨氏模量≤顶底板的50%,压裂产气条件较有利。By means of coal structure analysis,vitrinite reflectance,macerals,isothermal adsorption,pore size distribution,mechanical properties test and scanning electron microscope observation,the characteristics of coalbed methane enrichment and stable production reservoir are analyzed,and the evaluation criteria of high-quality coal reservoir are discussed.The results show that:(1)The thickness of coal seam is more than 4M,the vitrinite reflectance is 2%~3%,the gas content is more than 10 m;/t,and the hydrocarbon generation conditions are good;(2)The buried depth of coal seam is about 1200 m,the reservoir pressure is about 9.3 mpa,the transition pores and micropores are more than 60%,the roof and floor are argy lithology,the thickness is more than 2.5 m,and the gas storage conditions are more favorable.(3)The reservoir is dominated by primary structural coal and fractured coal,fractures are developed,reservoir permeability is higher than 0.30 mD,young’s modulus is less than 50%of the roof and floor,and fracturing gas production conditions are favorable.

关 键 词：煤层气 储层 生烃 吸附 孔隙 延川南 

分 类 号：P618.13[天文地球—矿床学] TE311[天文地球—地质学]