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下寒武统牛蹄塘组是常德地区重要的页岩气勘探层位之一,岩石类型主要为富炭硅质页岩、炭质页岩和石煤。以单井地质分析为基础,结合区域地质和露头资料,对常德地区牛蹄塘组黑色页岩有机地球化学、岩矿组成、储集空间类型、力学性质、含气性等进行了研究。该区牛蹄塘组地层相对稳定、分布范围广、页岩厚度大、有机碳含量高、有机质类型好、热演化程度高,孔隙和微裂缝发育,比表面积大、吸附气能力强,脆性矿物含量较高,具备良好的可压裂性。CY1井揭示牛蹄塘组页岩厚度大,含气量达到0.5~2.1m3/t,具有良好的储集条件。综合研究认为常德地区牛蹄塘组具有较好的页岩气勘探潜力。
The Lower Cambrian Niutitang Formation is one of the important shale gas exploration layers in Changde area. The main rock types are carbon-rich siliceous shale, carbonaceous shale and stone coal. Based on single-well geological analysis, combined with regional geology and outcrop data, organic geochemistry, rock-mine composition, reservoir space type, mechanical properties and gas-bearing properties of black shale in the Niutitang Formation in Changde area were studied. The Niutitang Formation in this area is relatively stable with a wide distribution, large shale thickness, high organic carbon content, good organic matter type, high degree of thermal evolution, developed pores and micro-cracks, large specific surface area, strong adsorption gas capability, brittle minerals High content, with good fracability. The CY1 well revealed that the Niutitang Formation shale has a large thickness with a gas content of 0.5 ~ 2.1m3 / t and has good storage conditions. The comprehensive study shows that the Niutitang Formation in Changde has better shale gas exploration potential.