天然气地球科学 ›› 2022, Vol. 33 ›› Issue (7): 11321143.doi: 10.11764/j.issn.1672-1926.2022.01.007
Lijun GAO1(),Peng WU2,Xuefeng SHI1,Yong LI3,Jiandong PANG1,Tiemei YANG1
摘要:
为完善海陆过渡相页岩储层分类方法,以鄂尔多斯盆地东缘临兴区块为例,在划分页岩源储类型基础上,结合电阻率、声波时差、补偿中子、自然伽马等常规测井和成像测井,利用页岩样品实验结果校正,优化了不同源储类型页岩的岩性、有机碳、孔隙度、含气量等关键参数测井解释模型,建立了海陆过渡相页岩气储层分类方法。结果表明:①海陆过渡相泥页岩存在砂质夹层型、灰质混积型和富有机质泥岩层理型三大类源储类型,利用声波、密度与自然伽马的3D交会图与成像测井可识别各类型岩性;②不同类型泥页岩的测井解释优化模型拟合结果显示区内页岩储层参数相对有利勘探,其中砂质夹层型页岩有机碳含量为0.25%~6.66%,孔隙度为0.10%~4.92%,含气量为0.15~4.39 m3/t,平均脆性指数为45%;灰质混积型泥页岩有机碳含量为1.98%~8.66%,孔隙度为0.31%~4.01%,含气量为0.82~3.72 m3/t,平均脆性指数为43%;富有机质层理型页岩有机碳含量在2.04%~14.53%之间,孔隙度为0.29%~5.29%,含气量为0.93~5.14 m3/t,平均脆性指数为37.54%;③建立的以源储类型为核心的 “三型九类”页岩储层分类方法具有实用性,其中I类、II类夹层型页岩和I类富有机质层理型页岩已在生产实践显现开发潜力。
中图分类号:
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