Characteristics and genesis of tuffaceous shale oil lithofacies:A case study of Lucaogou Formation in Santanghu Basin

作     者：Dongsheng Xiao Xiong fei Xu Jilun Kang Yiting Zhang Dongsheng Xiao;Xiong fei Xu;Jilun Kang;Yiting Zhang

作者机构：PetroChina Tuha Oilfield Company Exploration and Development Research InstituteChina 

出 版 物：《Petroleum Research》 (石油研究（英文）)

年 卷 期：2024年第9卷第1期

页      面：37-47页

核心收录：

学科分类：0820[工学-石油与天然气工程] 081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：This project was financially supported by China Petroleum and Natural Gas Co. Ltd in the range of the program entitled“Study on exploration and development theory and key technologies of Permian shale oil in Santanghu Basin-ZhundongRegional”for the years 2021-2024 project no.2021DJ 1807 

主　　题：shale oil Tuffaceous Formation mechanism Lucaogou formation Santanghu basin 

摘      要：Lucaogou Formation in the Santanghu Basin is a special lacustrine fine-grained sedimentary deposits rich in volcanic debris and carbonate,with abundant shale oil ***,understanding of shale oil characteristics and genesis remains ***,sedimentary environment,and formation mechanisms of tuffaceous shale oil are investigated based on core and thin section observations,X-ray diffraction,field emission SEM and geochemical *** show that three mixed lithofacies types are developed in Lucaogou Formation:blocky tuff,laminated tuffaceous dolomite,and laminated dolomitic *** lithofacies types are characterized by high content of felsic and dolostone,widespread organic matter,and low clay *** of tuffaceous shale oil sweet spots is primarily influenced by four factors:inputting of volcanic ash as a high-quality source rocks and reservoirs provides good material basis;devitrification of volcanic glass,calcitization,and dissolution are crucial for formation of reservoirs;expulsion of source rocks with high-abundance organic matter expulsion facilitates migration and accumulation of hydrocarbon in adjacent reservoirs;fracture development improves reservoir permeability to form highly productive sweet *** analyzing characteristics and genesis of tuffaceous shale oil,the main controlling factors of reservoir physical property and oil saturation are clarified,which is of great significance for selection of shale oil exploration zones.