陆相基质型页岩油甜点区成熟度界限探讨——以渤海湾盆地东营凹陷沙三下—沙四上亚段为例

Maturity limit of sweet spot area for continental matrix type shale oil: a case study of lower E and upper E sub-members in Dongying Sag, Bohai Bay Basin

李志明 孙中良 黎茂稳 曹婷婷 钱门辉 马晓潇 刘鹏 鲍云杰 蒋启贵 陶国亮 张隽 芮晓庆

LI Zhiming SUN Zhongliang LI Maowen CAO Tingting QIAN Menhui MA Xiaoxiao LIU Peng Bao Yunjie JIANG Qigui TAO Guoliang ZHANG Jun RUI Xiaoqing

中国石化 油气成藏重点实验室, 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 石油勘探开发研究院 无锡石油地质研究所, 江苏 无锡 214126 中国石化 石油勘探开发研究院, 北京 102206

SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms, Wuxi, Jiangsu 214126, China State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Wuxi, Jiangsu 214126, China Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 102206, China

陆相基质型页岩油有望成为我国页岩油增储上产的主力页岩油类型。鉴于成熟度是控制基质型页岩油甜点区分布的重要因素，在分析我国典型陆相不同有机质类型富有机质泥页岩实测镜质体反射率Ro值抑制程度基础上，以渤海湾盆地东营凹陷沙三下-沙四上亚段为例，探讨了陆相基质型页岩油甜点区成熟度界限。陆相富有机质泥页岩的有机质类型越好，其实测镜质体反射率Ro值抑制程度越显著。东营凹陷的洼陷区沙三下亚段富有机质泥页岩现今真实成熟度（等效镜质体反射率EqVRo）主要介于0.69%~1.05%，沙四上亚段富有机质泥页岩EqVRo值则主要介于0.74%~1.20%；综合地质与工程甜点条件的剖析，东营凹陷沙三下、沙四上亚段富有机质泥页岩基质型页岩油甜点区的现今真实成熟度EqVRo值为0.74%~1.20%，4个洼陷的深洼区均具有良好的基质型页岩油商业开发前景。

The matrix type shale oil will become the main contributer for increasing shale oil reserves and production in China. Maturity is an important factor for the controlling to the distribution of sweet spot area for matrix type shale oil. The vitrinite reflectance suppression ranges of continental organic rich shale with different organic matter type were analyzed, and the maturity limit of sweet spot area for continental matrix type shale oil was discussed taking the lower Es3 (third member of Shahejie Formation) and upper Es4 (fourth member of Shahejie Formation) sub-members of the Dongying Sag as a case study. The vitrinite reflectance suppression ranges of continental organic rich shale are positively correlated to organic matter types. The actual maturity (EqVRo) of organic matter rich shale of the lower Es3 in subsags of Dongying Sag was mainly at the range of 0.69%-1.05%, and that of the upper Es4 is mainly at the range of 0.74%-1.20%. Combining with the analysis of geological and engineering sweet spot conditions, the EqVRo of organic matter rich shale of both two sub-members range 0.74%-1.20%. The deeper areas of four sub-sags in the Dongying Sag all have favorable prospecting of commercial development for matrix type shale oil in the lower Es3 and upper Es4 sub-members.

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

https://doi.org/10.11781/sysydz202105767