Role of preservation conditions on enrichment and fluidity maintenance of medium to high maturity lacustrine shale oil  

作　　者：ZHAO Wenzhi LIU Wei BIAN Congsheng LIU Xianyang PU Xiugang LU Jiamin LI Yongxin LI Junhui LIU Shiju GUAN Ming FU Xiuli DONG Jin 

机构地区：[1]ZWZ Academician Research Studio,PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China [2]PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China [3]National Key Laboratory for Green Mining of Multi-Resource Collaborative Continental Shale Oil,Daqing 163712 [4]National Engineering Laboratory for Exploration and Development of Low-Permeability Oil&Gas Fields,Xi'an 710018,China [5]PetroChina Changqing Oilfield Company,Xi'an 710018,China [6]Research Institute of Petroleum Exploration and Development,PetroChina Dagang Oilfield Company,Tianjin 300280,China [7]Exploration and Development Research Institute of PetroChina Daqing Oilfield Company,Daqing 163712,China

出　　处：《Petroleum Exploration and Development》2025年第1期1-16,共16页石油勘探与开发(英文版)

基　　金：Supported by the National Natural Science Foundation of China(U22B6004);Project of PetroChina Research Institute of Petroleum Exploration and Development(2022yjcq03);Core Technology Key Project of China Petroleum Changqing Oilfield Company(KJZX2023-01).

摘　　要：In addition to the organic matter type,abundance,thermal maturity,and shale reservoir space,the preservation conditions of source rocks play a key factor in affecting the quantity and quality of retained hydrocarbons in source rocks of lacustrine shale,yet this aspect has received little attention.This paper,based on the case analysis,explores how preservation conditions influence the enrichment of mobile hydrocarbons in shale oil.Research showns that good preservation conditions play three key roles.(1)Ensure the retention of sufficient light hydrocarbons(C_(1)–C_(13)),medium hydrocarbons(C_(14)–C_(25))and small molecular aromatics(including 1–2 benzene rings)in the formation,which enhances the fluidity and flow of shale oil;(2)Maintain a high energy field(abnormally high pressure),thus facilitating the maximum outflow of shale oil;(3)Ensure that the retained hydrocarbons have the miscible flow condition of multi-component hydrocarbons(light hydrocarbons,medium hydrocarbons,heavy hydrocarbons,and heteroatomic compounds),so that the heavy hydrocarbons(C_(25+))and heavy components(non-hydrocarbons and asphaltenes)have improved fluidity and maximum flow capacity.In conclusion,in addition to the advantages of organic matter type,abundance,thermal maturity,and reservoir space,good preservation conditions of shale layers are essential for the formation of economically viable shale oil reservoirs,which should be incorporated into the evaluation criteria of shale oil-rich areas/segments and considered a necessary factor when selecting favorable exploration targets.

关 键 词：medium-to-high maturity lacustrine shale oil mobile hydrocarbon enrichment preservation conditions stratum energy field miscible hydrocarbon component retained hydrocarbon fluidity Songliao Basin Ordos Basin Junggar Basin Bohai Bay Basin 

分 类 号：P61[天文地球—矿床学]