EVALUATION OF CARBONIFEROUS-PERMIAN HYDROCARBON SOURCE ROCKS IN HUANGHUA SAG,BOHAI BAY BASIN,CHINA

摘要

The Huanghua Sag is located in the northern part of the Bohai Bay Basin and is a Mesozoic rift basin developed on the North China platform.Carboniferous source rocks are developed in the Huanghua Sag.The basin has experienced multiple stages of complex tectonics,and uneven uplifts and deformations have appeared in the basin.In addition,magma ejection is also developed in this area.The hydrocarbon generation evolution of the source rocks in the Huanghua Sag has the characteristics of discontinuity and grade differences.In this paper,based on the detailed study of structural history,we have conducted a systematic study on the burial history,heating history and hydrocarbon generation history of source rocks in the Huanghua Sag.At the same time,the EASY%Ro numerical simulation method was used for the apatite fission track (AFT) test and fluid inclusion analysis.The results show that the maturity of source rocks gradually develops with the generation of hydrocarbons.Combined with tectonic events,we discussed the intensity and time distribution of hydrocarbon generation of the source rocks.The hydrocarbon generation analysis of the source rock shows that the Huanghua Sag occurred continuous subsidence in the late Cenozoic.In the end,we proposed the co-production of Permian-Car-boniferous unconventional natural gas in the central-northern area of the Huanghua Sag in the Bohai Bay Basin.