Analysis Of Hydrocarbon Accumulation Conditions In The XXX Block Of The Pearl River Mouth Basin

Block XXX of the Pearl River Mouth Basin in the study area is located in the southwest of the Dongsha Uplift,the south is adjacent to the Panyu Low Uplift,and the northwest is adjacent to the Zhuyi Depression.Based on the exploration data in the study area and the latest research results in the Pearl River Mouth Basin,a comprehensive study of oil and gas geology such as structure,stratum,and sedimentation was carried out.At the same time,the conditions of oil/gas accumulation in the study area are analyzed,and the rules of oil/gas migration and accumulation and the main controlling factors of oil/gas accumulation are discussed.Then carry out basin oil and gas accumulation simulation and reveal the oil/gas accumulation model in the study area.Studies have shown that the hydrocarbon-rich sags such as Huizhou Sag and Xijiang Sag are the oil-generating centers of the study area.The Panyu 4 sag in Xijiang Sag is the main hydrocarbon-supply unit in the study area.The source rocks of Wenchang Formation and Enping Formation are the main source rocks,which is strong ability to generate hydrocarbons.The sedimentary sandstones of the Hanjiang Formation and the Zhujiang Formation are the main reservoirs with good physical properties.Traps are mainly structural traps such as anticlines and broken noses,which have a good matching relationship with hydrocarbon generation and expulsion.The hydrocarbon accumulation in the study area is mainly controlled by the strength of hydrocarbon generation and expulsion,the development degree of transmission conductors,the nature of faults,and the matching relationship between reservoir-cap combination and traps.Basin hydrocarbon accumulation simulation shows that some oil and gas pass through major transport systems such as controlled-border boundary faults,unconformity,and nearsource accumulation,and the remaining oil and gas continue to form long-range shallow reservoirs along the structural ridge.The hydrocarbon accumulation model in the study area is a stepped long-distance hydrocarbon accumulation along the structural ridge.