济阳拗陷沙河街组页岩与美国Bakken组页岩储层“甜点”特征对比  

Comparison of“sweet spots”characteristics of shale oil reservoir rocks between Shahejie Formation in China and Bakken Formation in North America

作　　者：陈美玲[1] 潘仁芳[1] 张超谟[1] 沈禄银 

机构地区：[1]长江大学油气资源与勘探技术教育部重点实验室,武汉430100

出　　处：《成都理工大学学报（自然科学版）》2016年第4期438-446,共9页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家重点基础研究发展计划(973)项目(2014CB239100)

摘　　要：从源岩到储层的思路,探讨济阳拗陷沙河街组页岩和美国Bakken组页岩储层特征和形成机理。通过对Bakken组和沙河街组页岩有机地球化学分析、岩性分析、储层物性分析和矿物学分析,表明沙河街组页岩储层“甜点”特征为：有机质以Ⅰ型干酪根为主;狑TOC〉2.36%,犚o为0.76%~0.90%;主要为纹层状泥灰岩、泥质白云岩、灰质泥岩、油泥岩和油页岩;孔隙度〉3%,渗透率〈0.5×10-3μm2;脆性矿物质量分数〉20%;含油饱和度为60%~90%;储层厚度为13.60~90 m;储层主要为沙三下亚段。对比Bakken有利页岩储层地质特征表明,Bakken组页岩储层“甜点”特征为：有机质以Ⅰ型干酪根为主;狑TOC〉5.36%,犚o为0.51%~0.72%;砂质白云岩;孔隙度〉3%,渗透率〈0.1×10-3μm2;脆性矿物质量分数〉50%;含油饱和度为50%~71%;储层厚度为3.10~12.20m;Bakken中段为优质储层段。沙河街组和Bakken组页岩储层形成的机理主要为有利的矿物组合和普遍发育的超压。T he characteristics and form ation m echanism of the shale oil reservoir rocks in the ShahejieForm ation and Bakken Form ation shale are discussed. Geochem ical analysis, lithology analysis,reservoir petrophysics analysis and m ineralogical analysis show that the characteristics of sw eet spotsof shale oil features for the Shahejie Form ation are as follow s： T h e organic m atter is dom inated bytype Ikerogen ;② T otal organic carbon is large than 2. 36% , w ith ranging from 0. 76% to 0. 90% ;③ Reservoir is com posed of lam inated argillaceous lim estone, argillaceous dolom ite, lim estonem udstone, oil m udstone and oil s h a le ;④ T he porosity is larger than 3% and perm eability is less than0.5 × 10-3 ym 2 ; ⑤ B rittle m inerals content is over 20% ; ⑥ Oil saturation is in the range of 60% -90% ; ⑦ shale thickness ranges from 13. 60 m to 90. 00 m ; ⑧ T he reservoir rocks for the petroleumsystem are low er of the 3rd of Shahejie Form ation. Sim ilarly, the sw eet spots of excellent reservoirs in Bakken are characterized by , The organic matter is predominantly type I -kerogen; ② Totalorganic carbon〉5. 36% , with R0 ranging from 0？ 5 1 % to 0？ 72% ; ③ Sandy dolostone has the bestreservoir properties;④ Porosity 〉 3 % and permeability 〈C0. 1 ×10-3 pm2; ⑤ Brittle minerals content〉 5 0 % ,（6） Oil saturation is in the range of 5 0 % -7 1 % ; Shale thickness ranges from 3. 10 m to 12.20 m ; The middle member is excellent reservoir rocks. The formation mechanism of the ShahejieFormation and Bakken shale reservoirs includes favorable mineral composition and extensivedevelopment of overpressure.

关 键 词：济阳拗陷 威利斯顿盆地 沙河街组 Bakken组 页岩油 储层特征 

分 类 号：TE132.2[石油与天然气工程—油气勘探]