湖南石门地区下寒武统牛蹄塘组页岩气储层特征及储集条件分析
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摘要
本文主要从岩性组合特征、岩石学特征、孔渗特征、比表面积、储集空间及其吸附性能等方面系统分析了湖南石门地区下寒武统牛蹄塘组页岩气储层特征及储集条件。该地区牛蹄塘组页岩脆性矿物含量为40.8%~79.6%,平均60.15%,脆性矿物含量丰富;脆性指数分布在0.41~0.82之间,平均0.61,脆性指数高。页岩有效孔隙度为0.69%~16.07%,平均10.16%,孔隙度中等偏高,且差异较大;渗透率为0.00027×10~(-3)μm~2~0.0057×10~(-3)μm~2,平均0.00092×10~(-3)μm~2(0.00092m D),渗透率相对较低。页岩中发育基质晶间孔、粒间孔、溶蚀孔以及有机质纳米孔等,且页岩原生孔隙系统的渗透率相当低,但原生孔隙内表面积大,拥有较多潜在的吸附空间。等温吸附试验结果表明,石门地区下寒武统牛蹄塘组黑色页岩的吸附含气量范围为0~6.5048cm~3/g,含气量推测值0.06m~3/t~3.32m~3/t,具有较好的吸附气性能,具备较好的页岩气资源前景。
In this study, the characteristics and reservoir conditions of the shale gas reservoir in the lower Cambrian of the Shimen area, Hunan, are systematically analyzed from the characteristics of lithologic assemblage, petrology, pore and permeability, specific surface area, reservoir space and adsorption properties. The content of brittle mineral in Niutitang formation is 40.8 % ~ 79.6 %, average 60.15 %, and the content of brittle mineral is abundant. The distribution of brittleness index is 0.41 ~ 0.82, the average is 0.61, and the brittleness index is high. The effective porosity of shale is 0.69 % ~ 16.07 %, with an average of 10.16 %, the porosity is moderately high and the difference is large. Permeability is 0.00027×10~(-3)μm~2 ~ 0.0057×10~(-3)μm~2, average 0.00092×10~(-3)μm~2(0.00092 m D), permeability is relatively low. Matrix intergranular pore, intergranular pore, dissolution pore and organic nano-pore are developed in shale, and that permeability of the primary pore system of shale is quite low, but the internal surface area of the primary pore is large, so that a large amount of gas can be store, and sufficient storage space is provided for shale gas. The results of isothermal adsorption experiments show that the adsorption gas content range of black shale in Niutitang formation of lower Cambrian in Shimen area is 0~6.5048 cm~3/g, and the estimated gas content is 0.06 m~3/t~3.32 m~3/t, which has good adsorption gas performance and good natural gas resource base.
In this study, the characteristics and reservoir conditions of the shale gas reservoir in the lower Cambrian of the Shimen area, Hunan, are systematically analyzed from the characteristics of lithologic assemblage, petrology, pore and permeability, specific surface area, reservoir space and adsorption properties. The content of brittle mineral in Niutitang formation is 40.8 % ~ 79.6 %, average 60.15 %, and the content of brittle mineral is abundant. The distribution of brittleness index is 0.41 ~ 0.82, the average is 0.61, and the brittleness index is high. The effective porosity of shale is 0.69 % ~ 16.07 %, with an average of 10.16 %, the porosity is moderately high and the difference is large. Permeability is 0.00027×10~(-3)μm~2 ~ 0.0057×10~(-3)μm~2, average 0.00092×10~(-3)μm~2(0.00092 m D), permeability is relatively low. Matrix intergranular pore, intergranular pore, dissolution pore and organic nano-pore are developed in shale, and that permeability of the primary pore system of shale is quite low, but the internal surface area of the primary pore is large, so that a large amount of gas can be store, and sufficient storage space is provided for shale gas. The results of isothermal adsorption experiments show that the adsorption gas content range of black shale in Niutitang formation of lower Cambrian in Shimen area is 0~6.5048 cm~3/g, and the estimated gas content is 0.06 m~3/t~3.32 m~3/t, which has good adsorption gas performance and good natural gas resource base.
引文
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[3]张琴,刘洪林,拜文华等.渝东南地区龙马溪组页岩含气量及其主控因素分析.天然气工业,2013,33(5):35-39.
[4]陈磊,姜振学,纪文明等.川西坳陷上三叠统须五段陆相页岩气储集层矿物成分特征及其意义.矿物岩石地球化学通报,2016,35(4):750-755.
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[11]肖正辉,王朝晖,杨荣丰等.湘西北下寒武统牛蹄塘组页岩气储集条件研究.地质学报,2013,87(10):1612-1623.
[12]王阳,朱炎铭,陈尚斌等.湘西北下寒武统牛蹄塘组页岩气形成条件分析.中国矿业大学学报,2013,42(4):586-594.
[13]张琳婷,郭建华,焦鹏等.湘西北下寒武统牛蹄塘组页岩气藏形成条件与资源潜力.中南大学学报(自然科学版),2014,45(4):1163-1173.
[14]姜文,唐书恒,龚玉红等.湘西北牛蹄塘组组页岩气形成条件及有利区预测.西南石油大学学报(自然科学版),2014,36(5):16-24.
[15]赵俊斌,唐书恒,张松航等.湘西北牛蹄塘组页岩孔隙特征及影响因素分析.煤炭科学技术,2014,42(S1):261-265.
[16]李娟,于炳松,张金川等.黔北地区下寒武统黑色页岩储层特征及其影响因素.石油与天然气地质,2012,33(3):364~374.
[17]郭伟,刘洪林,李晓波等.滇东北黑色岩系储层特征及含气性控制因素.天然气工业,2012,32(9):22~27.
[18]林拓,张金川,李博等.湘西北常页1井下寒武统牛蹄塘组页岩气聚集条件及含气特征.石油学报,2014,35(5):839-846.
[19]谢忱,张金川,李博等.渝东南渝科1井下寒武统富有机质页岩发育特征与含气量.石油与天然气地质,2013,34(1):11-15.
[20]孟凡洋,陈科,包书景等.湘西北下寒武统页岩含气性及主控因素分析——以慈页1井为例.岩性油气藏,2018,30(4):1-10.
[2]孙张涛.世界页岩气开发现状及对中国页岩气合理勘探开发的建议.国土资源情报,2015,175(7):48-51+13.
[3]张琴,刘洪林,拜文华等.渝东南地区龙马溪组页岩含气量及其主控因素分析.天然气工业,2013,33(5):35-39.
[4]陈磊,姜振学,纪文明等.川西坳陷上三叠统须五段陆相页岩气储集层矿物成分特征及其意义.矿物岩石地球化学通报,2016,35(4):750-755.
[5]李波文,张金川,党伟等.海相页岩与海陆过渡相页岩吸附气量主控因素及其差异性,科学技术与工程,2017,17(11):44-51.
[6]Loecks R G,Ruppel S C.Mississippian Barnett shale:Lithofacies and depositional setting of a deep-water shalegas succession in the Fort Worth basin,Texas.AAPG Bulletin,2007,91(4):579~601.
[7]郭岭,姜在兴,姜文利.页岩气储层的形成条件与储层的地质研究内容,地质通报,2011,30(2~3):385-392.
[8]Nekson P H.Pore-throat sizes in sandstones,tight sandstones and ahales.AAPG Bulletin,2009,93(3):329~340.
[9]田华,张永昌,柳少波等.压汞法和气体吸附法研究富有机质页岩孔隙特征.石油学报,2012,33(3):419~427.
[10]白振瑞.遵义—綦江地区下寒武统牛蹄塘组页岩沉积特征及页岩气评价参数研究.北京:中国地质大学(北京)硕士论文.2012.
[11]肖正辉,王朝晖,杨荣丰等.湘西北下寒武统牛蹄塘组页岩气储集条件研究.地质学报,2013,87(10):1612-1623.
[12]王阳,朱炎铭,陈尚斌等.湘西北下寒武统牛蹄塘组页岩气形成条件分析.中国矿业大学学报,2013,42(4):586-594.
[13]张琳婷,郭建华,焦鹏等.湘西北下寒武统牛蹄塘组页岩气藏形成条件与资源潜力.中南大学学报(自然科学版),2014,45(4):1163-1173.
[14]姜文,唐书恒,龚玉红等.湘西北牛蹄塘组组页岩气形成条件及有利区预测.西南石油大学学报(自然科学版),2014,36(5):16-24.
[15]赵俊斌,唐书恒,张松航等.湘西北牛蹄塘组页岩孔隙特征及影响因素分析.煤炭科学技术,2014,42(S1):261-265.
[16]李娟,于炳松,张金川等.黔北地区下寒武统黑色页岩储层特征及其影响因素.石油与天然气地质,2012,33(3):364~374.
[17]郭伟,刘洪林,李晓波等.滇东北黑色岩系储层特征及含气性控制因素.天然气工业,2012,32(9):22~27.
[18]林拓,张金川,李博等.湘西北常页1井下寒武统牛蹄塘组页岩气聚集条件及含气特征.石油学报,2014,35(5):839-846.
[19]谢忱,张金川,李博等.渝东南渝科1井下寒武统富有机质页岩发育特征与含气量.石油与天然气地质,2013,34(1):11-15.
[20]孟凡洋,陈科,包书景等.湘西北下寒武统页岩含气性及主控因素分析——以慈页1井为例.岩性油气藏,2018,30(4):1-10.