Structural characteristics of continental carbonate-rich shale and shale oil movability: A case study of the Paleogene Shahejie Formation shale in Jiyang Depression, Bohai Bay Basin, China  

作　　者：LIU Huimin BAO Youshu ZHANG Shouchun LI Zheng LI Junliang WANG Xuejun WU Lianbo WANG Yong WANG Weiqing ZHU Rifang ZHANG Shun WANG Xin 

机构地区：[1]Sinopec Shengli Oilfield Company,Dongying 257001,China [2]Research Institute of Exploration and Development,Sinopec Shengli Oilfield Company,Dongying 257015,China

出　　处：《Petroleum Exploration and Development》2023年第6期1320-1332,共13页石油勘探与开发（英文版）

基　　金：Supported by the China National Science and Technology Major Project(2017ZX05049-004);Sinopec Project(P22083,P23084).

摘　　要：Based on rock mineral and geochemical analysis, microscopic observation, physical property measurement, and thin laminae separation test, etc., the characteristics of typical laminae of the Paleogene Shahejie Formation carbonate-rich shale in the Jiyang Depression were analyzed, and the organic matter abundance, reservoir properties, and oil-bearing properties of different laminae were compared. Typical shale storage-seepage structures were classified, and the mobility of oil in different types of shale storage-seepage structure was compared. The results show that the repeated superposition of mud laminae and calcite laminae are the main layer structure of carbonate-rich shales. The calcite laminae are divided into micritic calcite laminae, sparry calcite laminae and fibrous calcite vein. The mud-rich laminae are the main contributor to the organic matter abundance and porosity of shale, with the best hydrocarbon generation potential, reservoir capacity, and oil-bearing property. The micritic calcite laminae also have relatively good hydrocarbon generation potential, reservoir capacity and oil-bearing property. The sparry calcite laminae and fibrous calcite vein have good permeability and conductivity. Four types of shale storage-seepage structure are developed in the carbonate-rich shale, and the mobility of oil in each type of storage-seepage structure is in descending order: sparry calcite laminae enriched shale storage-seepage structure, mixed calcite laminae enriched shale storage-seepage structure, fibrous calcite vein enriched shale storage-seepage structure, and micritic calcite laminae enriched shale storage-seepage structure. The exploration targets of carbonate-rich shale in the Jiyang Depression Shahejie Formation are different in terms of storage-seepage structure at different thermal evolution stages.

关 键 词：shale oil carbonate-rich shale shale fabric storage-seepage structure shale oil movability Paleogene Shahejie Formation Jiyang Depression Bohai Bay Basin 

分 类 号：P618.13[天文地球—矿床学]