摘要
为了系统研究渝东北地区下寒武统水井沱组和上奥陶统五峰组—下志留统龙马溪组页岩气聚集条件,利用野外露头观测、实验测试分析、概率统计等多种方法,分别对2套页岩的分布、有机地球化学特征、储集条件及含气性进行了全面分析。结果表明:2套页岩均具有有机碳(TOC)含量高、成熟度高、厚度适中、有机质类型以腐泥型干酪根为主、含气量较高的特征;2套页岩均夹有薄层粉砂岩、细砂岩,富含石英、长石等碎屑组分,易于破裂形成裂缝、微裂缝,为页岩气的聚集提供了有利的物质基础及储集空间;2套页岩均对甲烷具有较强的吸附能力,现场解析平均含气质量体积分别为1.07 m~3/t和2.30 m~3/t。在此基础上,进一步确定了2套页岩有利区分布面积,采用条件概率体积法对其资源潜力分别进行了评价,得出下寒武统水井沱组和上奥陶统五峰组—下志留统龙马溪组页岩气资源量分别为0.42万亿m~3和0.38万亿m~3,均具有良好的页岩气勘探前景,城口地区的明中—厚坪一带和巫溪地区的咸水—文峰—大同一带均可作为渝东北地区页岩气勘探的有利区域。
In order to evaluate Paleozoic shale gas potential in northeastern Chongqing,based on the methods of filed outcrops survey,experimental test and mathematical statistics,the distribution,source rock and reservoir conditions of Lower Cambrian Shuijingtuo Formation and Upper Ordovician Wufeng-Longmaxi Formation were comprehensively analyzed.These shale rocks are characterized by high organic carbon content,high maturity,appropriate thickness and mainly type I kerogen.The results of field shale desorption show that the average gas content is 1.07 m~3/t and 2.30 m~3/t respectively.The siltstone and fine sandstone are easy for fracturing due to more quartz and other detrital components.These characteristics provide a favorable material basis and reservoir space for shale gas accumulation.Evaluated with conditional probability volume method,the shale gas resources of Shuijingtuo Formation and Wufeng-Longmaxi Formation are 0.42×10~(12)m~3 and 0.38×10~(12)m~3 respectively.Chengkou and Wuxi should be favorable areas for shale gas exploration in the northeastern Chongqing.
引文
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