Study on Permian-Triassic Hydrocarbon Generation Evaluation and History of Late Accumulation in Huangqiao-Jurong Area

In Permian and Triassic in Huangqiao-Jurong Area,the conditions of oil generation,reservoir and caprock were favorable,which was the area for oil exploration.The source rocks were at mature and highly mature stage,the simulation experiment of hydrocarbon generation showed that the loss of total organic carbon in the process of hydrocarbon generation was less,and it could be regarded as an effective index in the assessment of high source rocks.The argillaceous source rocks of the Gufeng,the Longtan and the Dalong Formations were all good-better source rocks,but the limestone of the Qixia and the Qiliong Formations was poor.The high content of mineral asphalt matrix and low activation energy indicated that the source rocks were at the stage of hydrocarbon generating,activation energy distribution reflected the process of hydrocarbon generation at certain extent,the temperature range of hydrocarbon generation was small in Huangqiao Area,and it quickly generated hydrocarbon when it went into the main generation time,in contrast,Jurong Area was better for early and multi-time hydrocarbon generation.The source rocks generally experienced many times of hydrocarbon generation,for the secondary hydrocarbon generation in Himalayan Period,the source rocks are at the peak of hydrocarbon generation,its conversion rate mainly depends on sedimentary burial history,the source rocks in slow evolution process retain more potential,and the continuous hydrocarbon generation at the late stage is beneficial for keeping the accumulation on intense tectonic movement.