川东南石宝矿区龙潭组页岩气(煤层气)潜力分析 ——以SD1井为例
投稿时间:2021-11-21  修订日期:2022-02-19  点此下载全文
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邓敏 中国地质调查局成都地质调查中心 610081
兰叶芳 贵州工程应用技术学院 
程锦翔 中国地质调查局成都地质调查中心/国土资源部沉积盆地与油气资源重点实验室 
王正和 中国地质调查局成都地质调查中心/国土资源部沉积盆地与油气资源重点实验室 
余谦 中国地质调查局成都地质调查中心/国土资源部沉积盆地与油气资源重点实验室 
刘安然 四川省能投油气勘探开发有限公司 
赵安坤 中国地质调查局成都地质调查中心/国土资源部沉积盆地与油气资源重点实验室 
基金项目:“川南地区石宝矿段龙潭煤层气、致密气、页岩气资源潜力综合评价”项目;贵州省科技计划项目(编号:黔科合基础[2017]1407);贵州工程应用技术学院高层次人才科研启动项目(编号:院科合字G2017006)联合资助
中文摘要:二叠系龙潭组是四川盆地最主要的海陆过渡相页岩气勘探层位。通过钻井岩心和薄片观察、X射线衍射、扫描电镜、有机地球化学分析、孔渗测试、现场解吸和等温吸附等手段,以SD1井为例,对川东南石宝矿区龙潭组烃源岩特征和页岩气潜力进行研究。结果表明:1)研究区SD1井龙潭组泥页岩累计厚度约47.74米,与煤层及粉—细砂岩交互出现,主要为分流间湾和沼泽微相沉积;2)泥页岩总体粘土矿物含量高(平均值为49.7%),富菱铁矿、黄铁矿和锐钛矿,缺乏长石和碳酸盐矿物;3)有机质主要由镜质组构成,干酪根δ13C集中分布在-22.8 ‰~-24.2 ‰之间,以Ⅲ型干酪根为主,有机质丰度高(TOC平均值为7.37%),处于过成熟生干气阶段,生烃潜力大; 4)储集空间主要包括微裂缝、有机质孔、溶蚀孔和晶间孔,孔隙度变化在3.05%至4.35%之间,平均值为3.79%;渗透率约为0.486μD,远小于0.1mD,具超低孔超低渗特征;5)现场解吸泥页岩含气量为0.61m3/t~4.70 m3/t,平均值为2.16 m3/t,含气性相对较好,饱和吸附气含量均大于2.00 m3/t,显示出良好的吸附性能。综合研究认为,川东南石宝矿区龙潭组页岩气开发潜力较大,龙潭组上段中部C13-C15碳质泥岩夹煤层组合和龙潭组中段上部C17-C24碳质泥岩夹煤层组合为主力勘查层段。
中文关键词:龙潭组  海陆过渡相  烃源岩  页岩气  川东南
 
Shale gas (CBM)potential of Longtan Formation in Shibao mining area, Southeast Sichuan: A case study of Well SD1
Abstract:The Permian Longtan Formation is one of the most important shale gas exploration strata of marine-continental transitional facies in Sichuan Basin. Based on drilling core and thin section observation, X-ray diffraction analysis, scanning electron microscopy, organic geochemical analysis, porosity and permeability testing, in-situ gas content analysis and Langmuir adsorption isotherm, taking Well SD1 as an example, the characteristics of source rock and shale gas potential of Longtan Formation in Shibao mining area, southeast Sichuan were studied. The results show that: 1) The cumulative thickness of shale in Longtan Formation is about 47.74 m, which interinteracts with coal seam and fine sandstone, and is mainly deposited in microfacies of interdistributary bay and marsh. 2) The shale is characterized by high clay mineral content (49.7% on average), rich in siderite, pyrite and anatase, and lack of feldspar and carbonate minerals. 3) The organic matter is mainly composed of vitrinite. The δ13C of kerogen is concentrated in the range of -22.8 ‰ to -24.2 ‰. The Longtan shale has high total organic carbon (TOC) of 7.37% and contains type III gas-prone organic matter. The thermal evolution of organic matter is in the over-mature stage, showing good hydrocarbon potential. 4) The pore types mainly include microfractures, organic matter pores, dissolution pores and intercrystalline pores. The porosity varies from 3.05% to 4.35% with an average of 3.79%. The permeability is about 0.486μD, far below 1mD. Therefore, Longtan Formation is an obvious ultra-low porosity and ultra-low permeability reservoir. 5) The in-situ gas content of shale varies from 0.61m3/t to 4.70 m3/t, with an average of 2.16 m3/t, indicating relatively high gas content. Saturated adsorption gas content is greater than 2.00 m3/t, showing good adsorption performance. Generally, the comprehensive study shows that the shale gas development potential of Longtan Formation is great in Shibao mining area, and the C13-C15 carbonaceous mudstone/shale with coal seam assemblage in the middle part of upper Longtan Formation and the C17-C24 carbonaceous mudstone/shale with coal seam assemblage in the upper part are the main exploration sections.
keywords:Longtan Formation  Marine-continental transitional facies  Hydrocarbon source rocks  Shale gas  Southeast Sichuan
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