基于露头剖面﹑钻井岩心观察及样品实验测试结果,从优质页岩段厚度﹑有机碳含量﹑有机质类型﹑矿物含量以及含气量等方面,对湖北省来凤—咸丰区块上奥陶统五峰组—下志留统龙马溪组页岩气地质条件进行系统分析,并通过与四川盆地焦石坝页岩气建产区对比,评价了研究区页岩气资源潜力.结果表明:①研究区两河口向斜五峰组—龙马溪组下部优质泥页岩段北厚南薄,主体厚度在10 m左右.②研究区有机碳含量主体大于2.7,,往北有增加的趋势;有机质类型为Ⅱ1型;有机质热演化程度高,以生成干气为主.③研究区页岩脆性矿物含量超过60,,大量发育有机质孔和微裂缝;含气量北高南低,北部的来地1井和龙潭坪剖面含气量超过3.0 m3/t.④与四川盆地焦石坝页岩气田焦页1井相比,虽然来凤—咸丰区块优质页岩段厚度较小,有机碳含量略低,但两者脆性矿物含量﹑含气量相当,具有一定的页岩气资源潜力.指出两河口向斜北部为有利区.

Based on outcrops, drilling cores and sample experimental data, the geological conditions of shale gas of the Upper Ordovician Wufeng Formation and the Lower Silurian Longmaxi Formation in Laifeng-Xianfeng block, Hubei Province, are systematically discussed from the aspects of thickness, organic carbon content, organic matter type, mineral composition and gas content of the high-quality shale section. Compared with Well Jiaoye 1 in Jiaoshiba shale gas field, one of the production areas in Sichuan Basin, the potential of shale gas in Laifeng-Xianfeng block is evaluated. The results show that: (1) The high quality shale section in the lower part of Wufeng Formation-Longmaxi Formation of Lianghekou Syncline in the study area is thick in the north and thin in the south, and most of the thickness is about 10 m. (2) Most of the organic carbon content of shale in the study area is more than 2.7,, which tends to increase towards the north; the organic matter type is Ⅱ1; the organic matter has a high degree of thermal evolution, mainly generating dry gas. (3) The shale in the study area contains more than 60, brittle minerals and a large number of organic pores and microfractures; the gas content of shale is higher in the north than in the south, and the gas content of Well Laidi 1 and Longtanping outcrop in the north is more than 3.0 m3/t. (4) Compared with Well Jiaoye 1 of Jiaoshiba shale gas field in Sichuan Basin, although the high-quality shale in Laifeng-Xianfeng block has a smaller thickness and a slightly lower organic carbon content, the brittle minerals and gas content of both are similar, which shows a certain shale gas resource potential in the study area, with the north of Lianghekou syncline as a favorable shale gas area.