黔北地区牛蹄塘组富有机质泥岩储层特征

发布时间：2018-03-10 02:22

本文选题：富有机质泥岩　切入点：牛蹄塘组　出处：《西南石油大学学报(自然科学版)》2017年04期 　论文类型：期刊论文

【摘要】：为全面研究黔北地区牛蹄塘组富有机质泥岩储层特征,对该组7口页岩气调查井和4口地质浅钻的岩芯进行了系统采样,并做了矿物学分析、地球化学分析、孔隙度和渗透率测定、含气性分析等实验。结果表明,牛蹄塘组富有机质泥岩主要发育于深水陆棚相带,岩性以含粉砂炭质泥岩、粉砂质炭质泥岩为主,脆性矿物以石英+长石组合为主,方解石、白云石、黄铁矿等自生脆性矿物含量总体较低;黏土矿物含量较低,变化范围较大,成分以伊利石为主。有机碳含量普遍较高,在1.5%~15.7%,有机质成熟度174%~3.40%,总体演化程度较高;平均岩石密度2.52g/cm~3,BET比表面积0.33~33.76m~2/g;微观储集空间以粒间(晶间)孔为主,其次为粒内孔,有机质孔发育较差,微裂缝总体不发育,具有低孔低渗—低孔超低渗的储层特征;总含气量0.02~2.05m~3/t,现场解析气中N_2、H_2含量异常,CH_4等烃类气体含量较低。
[Abstract]:In order to comprehensively study the characteristics of organic mudstone reservoirs in Niulitang formation, 7 shale gas survey wells and 4 shallow geological cores in this group were systematically sampled, and mineralogical and geochemical analysis were made. The determination of porosity and permeability, the analysis of gas-bearing properties and so on. The results show that the mudstone rich in organic matter of Niulitang formation is mainly developed in the deep water shelf facies zone, and the lithology is mainly silty carbonaceous mudstone and silty carbonaceous mudstone. The main brittle minerals are quartz feldspar assemblage, calcite, dolomite, pyrite, etc. At 1.5 ~ 15.7m, the maturity of organic matter is 174 ~ 3.40, and the overall evolution degree is relatively high; the average rock density is 2.52g / cm ~ (-3) BET specific surface area 0.33 ~ (33) m ~ (-2 / g); the microreservoir space is dominated by intergranular (intergranular) pore, followed by intragranular pore, organic matter pore is poor, and microfracture is not developed on the whole. It has the characteristics of low porosity and low permeability, low porosity and ultra-low permeability, the total gas content is 0.02 ~ 2.05 m ~ (3 / t), and the gas content of N _ 2H _ 2 in gas is abnormal and Ch _ 4 is low.
【作者单位】：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】：中国地质调查局油气基础性公益性地质调查项目(DD20160176) 国土资源部油气资源战略研究中心项目(2009GYXQ15-03) 贵州省地质勘查基金项目(GZSYYQZYDC2012-002)
【分类号】：P618.13

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