Wuhan Institute of Geology and Mineral Resources,China Geological Survey
【研究目的】湘中地区二叠系页岩气勘探发现有助于重新评价湘中坳陷页岩气资源潜力，拓展华南地区二叠系页岩气勘探范围。【研究方法】本文基于湘中邵阳地区部署的湘邵地1井，采用全井段取心、气测录井和现场解析实验，查明二叠系主要页岩层系分布、含气性特征。【研究结果】湘邵地1井钻获大隆组硅质页岩含气层88.2m，现场解析总含量为1.29-9.97m3/t，平均4.85m3/t；钻获龙潭组泥岩与粉砂岩互层含气层34.6m，现场解析总含气量0.57-3.42 m3/t，平均1.78 m3/t；泥岩夹泥质粉砂岩含气层111.6m，现场解析总含气量0.90-4.55m3/t，平均2.01 m3/t。【结论】区内二叠系页岩气富集主要受断裂封闭性影响，滑脱断裂下盘是页岩气主要富集区。研究成果对湘中地区二叠系页岩气勘探开发具有重要指导意义。
[Objective]The discovery of Permian shale gas in central Hunan is helpful to reappraise the potential of shale gas resources in Xiangzhong Depression and expand the scope of Permian shale gas exploration in South China. [Methods] Based on XSD1 well deployed in Shaoyang area, central Hunan Province, this paper uses whole-section coring, gas logging and field analytical experiments to find out the distribution and gas bearing characteristics of major Permian shale formations. [Results] 88.2m of Dalong Formation siliceous shale gas was drilled in XSD1 well, with the total analytical content of 1.29-9.97m3/t, with an average of 4.85m3/t. The gas layer between mudstone and siltstone of Longtan Formation has been drilled with a total gas content of 0.57-3.42 m3/t, with an average of 1.78 m3/t. Mudstone with argillaceous siltstone gas layer is 111.6m, and the total gas content analyzed on site is 0.90-4.55m3/t, with an average of 2.01 m3/t. [Conclusions] The enrichment of Permian shale gas in this area is mainly affected by the fault sealing property, and the footwall of slip faults is the main enrichment area of shale gas. The research results have important guiding significance to the exploration and development of Permian shale gas in central Hunan area.