天然气地球科学 ›› 2022, Vol. 33 ›› Issue (3): 441450.doi: 10.11764/j.issn.1672-1926.2021.09.007
马元稹1(),王猛2(),李嘉敏1,赵健光1,贾腾飞1,朱俊卿1
Yuanzhen MA1(),Meng WANG2(),Jiamin LI1,Jianguang ZHAO1,Tengfei JIA1,Junqing ZHU1
摘要:
以沁水盆地中的暗色页岩为主要研究对象,在盆地北部Y2井、中部Y5井、中南部Y3井3口调查井资料分析、钻孔采样、实验测试等相关工作基础上,分层段系统研究了沁水盆地煤系页岩气有机地球化学及储层物性特征。结果表明:研究区钻孔煤系页岩样TOC平均值大于2.0%,干酪根类型均以Ⅲ型干酪根为主,页岩显微组分主要为镜质组与惰质组,同时页岩有机质热演化程度较高,在地史时期中已有大量的热解气生成。研究区页岩形成于海陆过渡相沉积环境,矿物成分中黏土矿物含量较高,石英含量较低。各层段页岩脆性系数一般在30%~40%之间,脆性系数Ⅳ>III>Ⅰ>Ⅱ;气测异常层、含气层和气层厚度比例分别为30.80%、16.09%和53.11%,气测显示以气层为主,气测显示级别依次为IV>II>III>I。综合煤系页岩有机碳含量、有机质成熟度、页岩有效厚度、脆性特征和含气性特征等参数得出各层段页岩气的勘探开发潜力有利顺序依次为II>IV>III>I。
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