台间盆地相富有机质页岩特征研究——以南丹地区莫德剖面罗富组为例
发布时间：2018-10-08 13:42
【摘要】：早泥盆世埃姆斯期至早石炭世杜内期,南丹-河池一线为独特的台间盆地环境,位于桂中坳陷西部边缘,自下而上发育塘丁组、罗富组、榴江组、五指山组和鹿寨组含磷、锰的泥质、硅质和扁豆状的灰岩沉积。其中罗富组发育有连续的,具有一定沉积厚度的黑色、深灰色、灰黑色泥页岩沉积,具有页岩气开发潜力。针对南丹地区泥盆纪剖面罗富组进行的实测和沉积学分析能够更进一步的评价其中罗富组沉积的页岩气前景,研究共采集样品120件,采样间距为2m~3m。泥页岩层位选择其中10件含有机质样品进行有机质特征、矿物成分、孔隙度、孔隙结构等测试,20件样品用于电镜分析,80件样品进行薄片鉴定分析。综合野外露头剖面测量和样品地球化学测试及微孔结构观察结果,确定南丹地区罗富组下段具备形成页岩气的资源基础和优越的成藏条件。罗富组厚约330m,以富硅质泥页岩的首现,将之划为上、下两段。罗富组下段有机质丰度高(TOC分布于1.64%~3.69%之间),成熟度小于3.6%(Ro值介于3.14%~4.19%),泥页岩厚度大(大于100m),储层微孔隙发育,脆性矿物含量合适(介于48%~58%),黏土矿物之中不含蒙皂石。将研究剖面页岩气储层的地化、物性特征及沉积厚度与北美及四川页岩气对比,判断研究区中泥盆统罗富组下段具有较好的页岩气勘探潜力。
[Abstract]:From early Devonian to early Carboniferous, the Nandan Hechi line is a unique inter-platform basin environment, which is located at the western margin of the central Guangxi depression. It is developed from the bottom to the top of the Tangding formation, Luofu formation, Shuijiang formation, Wuzhishan formation and Luzhai formation. Manganese muddy, siliceous, and lentil-like limestone deposits. Among them, Luofu formation has continuous black, dark gray and gray shale deposits with a certain sedimentary thickness, which has the potential of shale gas development. According to the actual measurement and sedimentological analysis of Luofu formation in Devonian section of Nandan area, the prospect of shale gas deposited in Luofu formation can be further evaluated. A total of 120 samples were collected with a sampling interval of 2 mm2. Ten samples containing organic matter were selected for organic matter characteristics, mineral composition, porosity, pore structure and so on. 20 samples were used for electron microscope analysis, 80 samples for thin slice identification and analysis. Based on the results of outcrop profile measurements, geochemical measurements of samples and observation of micropore structure, it is determined that the lower member of the Luofu formation in Nandan area has a resource base for shale gas formation and favorable conditions for reservoir formation. The Luofu formation is about 330 m thick, with the first occurrence of siliceous shale, which is divided into the upper and lower sections. The lower member of Luofu formation has a high abundance of organic matter (TOC is between 1.64% and 3.69%), a maturity of less than 3.6% (Ro value is between 3.14% and 4.19%), a large thickness of shale (> 100m), a development of reservoir micropores, a suitable content of brittle minerals (between 48% and 58%), and no montmorillonite in clay minerals. The geochemical, physical properties and sedimentary thickness of shale gas reservoirs in the study section are compared with those in North America and Sichuan, and the lower member of Luofu formation of the middle Devonian in the study area has good shale gas exploration potential.
【作者单位】： 中国地质大学;中国地质调查局油气资源调查中心;油气藏地质及开发工程国家重点实验室成都理工大学;成都理工大学沉积地质研究院;
【基金】：中国地质调查局油气资源调查中心“大南盘江地区泥盆、石炭系富有机质页岩层系沉积特征及岩相古地理编图”(编号:12120115005101)
【分类号】：P618.13
本文编号：2256963
[Abstract]:From early Devonian to early Carboniferous, the Nandan Hechi line is a unique inter-platform basin environment, which is located at the western margin of the central Guangxi depression. It is developed from the bottom to the top of the Tangding formation, Luofu formation, Shuijiang formation, Wuzhishan formation and Luzhai formation. Manganese muddy, siliceous, and lentil-like limestone deposits. Among them, Luofu formation has continuous black, dark gray and gray shale deposits with a certain sedimentary thickness, which has the potential of shale gas development. According to the actual measurement and sedimentological analysis of Luofu formation in Devonian section of Nandan area, the prospect of shale gas deposited in Luofu formation can be further evaluated. A total of 120 samples were collected with a sampling interval of 2 mm2. Ten samples containing organic matter were selected for organic matter characteristics, mineral composition, porosity, pore structure and so on. 20 samples were used for electron microscope analysis, 80 samples for thin slice identification and analysis. Based on the results of outcrop profile measurements, geochemical measurements of samples and observation of micropore structure, it is determined that the lower member of the Luofu formation in Nandan area has a resource base for shale gas formation and favorable conditions for reservoir formation. The Luofu formation is about 330 m thick, with the first occurrence of siliceous shale, which is divided into the upper and lower sections. The lower member of Luofu formation has a high abundance of organic matter (TOC is between 1.64% and 3.69%), a maturity of less than 3.6% (Ro value is between 3.14% and 4.19%), a large thickness of shale (> 100m), a development of reservoir micropores, a suitable content of brittle minerals (between 48% and 58%), and no montmorillonite in clay minerals. The geochemical, physical properties and sedimentary thickness of shale gas reservoirs in the study section are compared with those in North America and Sichuan, and the lower member of Luofu formation of the middle Devonian in the study area has good shale gas exploration potential.
【作者单位】： 中国地质大学;中国地质调查局油气资源调查中心;油气藏地质及开发工程国家重点实验室成都理工大学;成都理工大学沉积地质研究院;
【基金】：中国地质调查局油气资源调查中心“大南盘江地区泥盆、石炭系富有机质页岩层系沉积特征及岩相古地理编图”(编号:12120115005101)
【分类号】：P618.13
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