湘西北地区新元古界陡山沱组页岩气成藏条件
发布时间：2018-08-27 15:56
【摘要】：湘西北地区广泛发育新元古界震旦系陡山沱组暗色泥页岩,已有钻井中气显示活跃,揭示出该地区较好的页岩气勘探潜力。在观察野外地质露头的基础上,通过地球化学分析、扫描电镜、X射线衍射、低温氮气吸附、等温吸附等分析测试,对陡山沱组泥页岩的发育及分布规律、有机地球化学特征、储层特征及吸附性能等页岩气成藏条件进行了综合研究,并优选了有利区带。结果表明:湘西北地区陡山沱组暗色泥页岩分布变化大,仅在大庸向斜地区沉积厚度较大,为20~50 m,有机碳质量分数为0.5%~3.0%,有机质类型以Ⅰ型为主,有机质成熟度为3.0%~4.0%,达到过成熟演化阶段,具备较为有利的生气条件;泥页岩储层矿物成分以脆性矿物为主,质量分数为21%~78.7%,发育多种类型孔隙空间,比表面积和孔体积均较高,多个泥页岩样品等温吸附实验统计显示,甲烷最大吸附质量体积为0.80~1.77 m3/t,泥页岩储层具有较好的储集条件及吸附性能。湘西北大庸向斜地区构造条件相对稳定,保存条件较好,具有有利的页岩气成藏条件,可作为陡山沱组页岩气勘探的有利区带。
[Abstract]:The dark mud shale of the Doushantuo formation of the Neoproterozoic Sinian is widely developed in the northwest of Hunan Province, and the gas is active in drilling, which reveals the potential of shale gas exploration in this area. On the basis of field geological outcrop observation, through geochemical analysis, scanning electron microscope X-ray diffraction, low temperature nitrogen adsorption, isothermal adsorption and so on, the development and distribution law and organic geochemical characteristics of mudstone shale in Doushantuo formation were studied. The reservoir characteristics and adsorption properties of shale gas reservoir forming conditions were studied, and favorable zones were selected. The results show that the distribution of dark mudstone shale in Doushantuo formation in northwestern Hunan has a great change, only in the Dayong syncline, the sedimentary thickness is 20 ~ 50 m, the organic carbon mass fraction is 0.5 ~ 3.0%, and the type of organic matter is mainly type 鈪，
本文编号：2207749
[Abstract]:The dark mud shale of the Doushantuo formation of the Neoproterozoic Sinian is widely developed in the northwest of Hunan Province, and the gas is active in drilling, which reveals the potential of shale gas exploration in this area. On the basis of field geological outcrop observation, through geochemical analysis, scanning electron microscope X-ray diffraction, low temperature nitrogen adsorption, isothermal adsorption and so on, the development and distribution law and organic geochemical characteristics of mudstone shale in Doushantuo formation were studied. The reservoir characteristics and adsorption properties of shale gas reservoir forming conditions were studied, and favorable zones were selected. The results show that the distribution of dark mudstone shale in Doushantuo formation in northwestern Hunan has a great change, only in the Dayong syncline, the sedimentary thickness is 20 ~ 50 m, the organic carbon mass fraction is 0.5 ~ 3.0%, and the type of organic matter is mainly type 鈪，
本文编号：2207749
本文链接：https://www.wllwen.com/kejilunwen/shiyounenyuanlunwen/2207749.html
