Gulong shale oil enrichment mechanism and orderly distribution of conventional–unconventional oils in the Cretaceous Qingshankou Formation,Songliao Basin,NE China

作     者：ZHANG Shuichang ZHANG Bin WANG Xiaomei FENG Zihui HE Kun WANG Huajian FU Xiuli LIU Yuke YANG Chunlong ZHANG Shuichang;ZHANG Bin;WANG Xiaomei;FENG Zihui;HE Kun;WANG Huajian;FU Xiuli;LIU Yuke;YANG Chunlong

作者机构：PetroChina Research Institute of Petroleum Exploration&DevelopmentBeijing 100083China CNPC Key Laboratory of Petroleum GeochemistryBeijing 100083China National Key Laboratory for Multi-resource Collaborated Green Development of Continental Shale OilDaqing 163712China PetroChina Daqing Oilfield Co.Ltd.Daqing 163712China 

出 版 物：《Petroleum Exploration and Development》 (石油勘探与开发（英文版）)

年 卷 期：2023年第50卷第5期

页      面：1045-1059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] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 

基　　金：Supported by the Heilongjiang Province S&D Project(2022-JS-1740,2022-JS-1853) China National Petroleum Corporation Scientific Research and Technological Development Project(2021DJ1808) 

主　　题：Songliao Basin Cretaceous Qingshankou Formation Gulong shale oil organic carbon storage orderly distribution of conventional-unconventional oil fault sealing whole petroleum system shale oil enrichment 

摘      要：Through the study of organic matter enrichment,hydrocarbon generation and accumulation process of black shale of the Cretaceous Qingshankou Formation in the Songliao Basin,the enrichment mechanism of Gulong shale oil and the distribution of conventional–unconventional oil are *** Songliao Basin is a huge interior lake basin formed in the Early Cretaceous under the control of the subduction and retreat of the western Pacific plate and the massive horizontal displacement of the Tanlu Fault Zone in Northeast *** the deposition of the Qingshankou Formation,strong terrestrial hydrological cycle led to the lake level rise of the ancient Songliao Basin and the input of a large amount of nutrients,resulting in planktonic bacteria and algae *** seawater intrusion events promoted the formation of salinization stratification and anoxic environment in the lake,which were beneficial to the enrichment of organic *** analysis confirms that the biogenic organic matter of planktonic bacteria and algae modified by microorganisms plays an important role in the formation of high-quality source rocks with high oil generation *** are four favorable conditions for the enrichment of light shale oil in the Qingshankou Formation of the Gulong Sag,Songliao Basin:the moderate organic matter abundance and high oil potential provide sufficient material basis for oil enrichment;high degree of thermal evolution makes shale oil have high GOR and good mobility;low hydrocarbon expulsion efficiency leads to a high content of retained hydrocarbons in the source rock;and the confinement effect of intra-layer cement in the high maturity stage induces the efficient accumulation of light shale *** restoration of hydrocarbon accumulation process suggests that liquid hydrocarbons generated in the early(low–medium maturity)stage of the Qingshankou Formation source rocks accumulated in placanticline and slope after long-distance secondary migr