宜昌地区五峰组—龙马溪组页岩储层录测井综合评价——以Y2井录井实践为例

Comprehensive Logging Evaluation of Shale Reservoirs in Wufeng—Longmaxi Formation in Yichang Area

宜昌地区页岩气勘探实钻揭示,五峰组一龙马溪组黑色页岩厚度38.5m,其中优质页岩厚度20.5m。通过实验室分析测试资料及录测井资料分析发现,优质页岩TOC含量平均3.0%,孔隙度平均4.0%,脆性矿物含量达70%以上,含气量平均2.0m^3/t以上,综合评价为I类页岩气储层。通过页岩含气性影响因素研究发现,页岩TOC含量对页岩含气性控制程度高,页理缝发育程度间接控制页岩含气量。

The field drilling during the shale gas exploration in Yichang area revealed that the black shale thickness of the Wufeng-Longmaxi Formation was 3&5 m,with its high quality shale thickness being 20.5 m.The analysis of laboratory test data and logging data shows that the TOC content of high quality shale is 3.0%,porosity is 4.0%,brittleness mineral content is more than 70%and gas content is more than 2.0 m^3/t,on average,which is comprehensively evaluated as I-class shale gas reservoirs.It is found based on the study of the influencing factors for gasbearing potential that the content of TOC in shale has a high degree of control on gas-bearing potential,and the development of cleavage joints indirectly controls gas-bearing potential.