冀北坳陷中元古界洪水庄组页岩油勘探前景探讨

Discussion on prospecting shale oil potential of Mesoproterozoic Hongshuizhuang Formation in the Jibei Depression

李志明 孙中良 鲍云杰 徐二社 周勇水 张云献

LI Zhiming SUN Zhongliang BAO Yunjie XU Ershe ZHOU Yongshui ZHANG Yunxian

中国石化 石油勘探开发研究院 无锡石油地质研究所, 江苏 无锡 214126 页岩油气富集机理与有效开发国家重点实验室, 江苏 无锡 214126 中国石化 油气成藏重点实验室, 江苏 无锡 214126 中国石化 中原油田分公司 勘探开发研究院, 河南 濮阳 457001

Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Wuxi, Jiangsu 214126, China SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms, Wuxi, Jiangsu 214126, China Exploration and Production Research Institute of Zhongyuan Oilfield Branch Company, SINOPEC, Puyang, Henan 457001, China

为评价冀北坳陷中元古界洪水庄组页岩油勘探前景，对钻井岩心和露头剖面典型样品开展热解、基质孔隙度与渗透率、压汞+氮吸附、氩离子抛光+扫描电镜、X衍射全岩矿物等分析，综合前人分析与研究成果，剖析了洪水庄组页岩油形成条件，估算了页岩油资源潜力并探讨勘探前景。冀北坳陷洪水庄组中部潟湖相黑色泥页岩厚度主要介于35~55 m，有机质类型以Ⅱ1、Ⅱ2型为主，为一套富有机质的好—极好烃源岩，等效镜质体反射率处于0.80%~1.25%；基质孔隙度主要介于1.0%~8.0%，基质渗透率介于(2~100)×10-6 μm2，孔隙以孔径大于50 nm的无机孔缝为主；恢复后热解游离烃S1主要介于1.60~6.50 mg/g，残余气态烃介于0.13~0.24 m3/t，具有较好的含油气性；脆性矿物含量平均介于61.9%~72.3%，具备良好的可压裂改造性。冀北坳陷洪水庄组富有机质页岩型页岩油地质资源量约为12×108 t，可采资源量为0.72×108 t，具备针对洪水庄组富有机质泥页岩开展页岩油勘探的资源基础，具有较好的基质型页岩油勘探前景。

In order to evaluate the shale oil prospecting potential of the Mesoproterozoic Hongshuizhuang Formation in the Jibei Depression, the analyses of routine Rock-Eval pyrolysis, matrix porosity and permeability, mercury intrusion and nitrogen adsorption, argon ion polishing SEM and X-ray diffraction of bulk rock of typical core samples were carried out in this study. The shale oil forming conditions of the Hongshuizhuang Formation were studied, the shale oil resource was assessed, and the prospecting potential was discussed based on previous results. The results show that the lagoon facies black shale in the middle section of the Hongshuizhuang Formation is mainly 35-55 m thick with organic matter types of Ⅱ1 and Ⅱ2, and is a set of good- to excellent-quality source rock. The equivalent vitrinite reflectance of organic-rich black shale is 0.80%-1.25%. The matrix porosity is mainly 1.0%-8.0%, and the matrix permeability is (2-100)×10-6 μm2. The pores are dominated by inorganic pores and fissures with the diameter of pore larger than 50 nm. The values of S1 after recovery is mainly 1.60-6.50 mg/g, and the content of residual hydrocarbon gas distributes 0.13-0.24 m3/t, indicating good hydrocarbon potential. The average content of brittle minerals is 61.9%-72.3%, with good frangibility. The shale oil geological resource is about 12×108 t, and the shale oil recoverable resource is about 0.72×108 t for organic matter rich shale of the Hongshuizhuang Formation. These suggested that the organic matter rich shale of the Hongshuizhuang Formation in the Jibei Depression has a resource basis for shale oil exploration with good prospecting potential.

国家自然科学基金项目 42090022;中国石化科技开发部项目 P18084;中国石化科技开发部项目 P20049-1

https://doi.org/10.11781/sysydz202301029