摘要
In-situ fluid phase behavior is important in determining hydrocarbon contents and the multiphase flow through shale reservoirs.The gas-to-oil ratio(GOR) has been recognized as a critical indicator of fluid types.However,little is known about the impact of fluid phase variation across the thermal maturity on shale oil/gas production(e.g.,estimated ultimate recovery,EUR).According to the specific gravity ratio of oil/gas,the producing GOR was converted and normalized into a mass fraction of gas in total hydrocarbons(MGOR) to compare North American shale oil/gas plays with Chinese shale oil and hybrid gas-condensate plays.A correlation between MGOR,the fluid phases,and production data was established to identify five phase stages of flow.MGORvaries systematically with the different production zones,which shows promise in rapidly indicating the well production performance and high production stages of shale oil/gas plays.The hybrid shale gas condensate index,Tmax,and total gas contents were integrated to present the fluid types and maturity of shale gas-condensates,which indicates fluid phase and production variation across thermal evolution.The results offer a unique perspective on the shale oil reservoir producibility based on the impact of GOR on fluid phases and EUR from the dominant global oil/gas plays.
基金
financially supported by the National Natural Science Foundation of China (Nos.42172140,U2244207,and 42202179)
Science Foundation for Distinguished Young Scholars of China University of Petroleum,Beijing (No.2462020QNXZ004)
China National Petroleum CorporationChina University of Petroleum (Beijing) Strategic Cooperation Science and Technology Project (No.ZLZX2020-01-06)
State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum (No.PRP/open-2217)
State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,the University of Liverpool and China Scholarship Council Awards (No.202009110097)
the AAPG Foundation Grants-in-Aid award。