Modeling of Hydrocarbon Secondary Migration in the Chaluhe Sag,Yitong Basin

Tang Wenxu; Cao Qiang

doi:10.3799/dqkx.2014.069

Abstract：Based on the analyses of petroleum systems in the Chaluhe sag,hydrocarbon secondary migration in thesource-reservoir assemblage (E2 s-E2 s)was evaluated by using 2D basin modeling technique.This study aims to investigate the individ-ual hydrocarbon migration-accumulation units,analyze different conditions for the hydrocarbon accumulation,and locate possi-ble favorable areas as exploration targets.The following conclusions are drawn:(1 )Key geologic elements of the petroleum systems are well integrated in the Chaluhe,three events of hydrocarbon accumulation can be identified,and the E2 s-E2 s (!)is recognized as the most significant petroleum system in the study area.(2)Secondary migration direction and intensity were mainly controlled by the fluid potential energy field.Hydrocarbon accumulation during the main period of hydrocarbon migra-tion was characterized by wide distribution and high density.Hydrocarbon fluids mainly charged two areas with lower fluid potential,namely along the northwest basin-marginal fault and the eastern Wanchang,Liangjia uplifts,respectively.(3)The Chaluhe sag consists off our hydrocarbon migration-accumulation units,including units Ⅰ,Ⅱ,Ⅲ,and Ⅳ.Unit II has the best potential for hydrocarbon migration and accumulation,followed by unit Ⅰ.The periclinal area in the Wanchang uplift ranks to be the most favorable area for oil and gas exploration in the Chaluhe sag.