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Forming Mechanism of Overpressure and Its Significance on Hydrocarbon Accumulation in Damintun Sag

SHI Jian-nan~(1),JIANG Jian-qun~(2),CHEN Fu-xin~(2),GU Guo-zhong~(2)(1.Key Laboratory for Hydrocarbon Accumulation Mechanism,Ministry of Education,China University of Petroleum,Beijing 102249,China;2.Exploration & Development Institute of Liaohe Oilfield Branch Company,PetroChina,Panjin 124010,China)  
The overpressure states of sedimentary basin are multiform,and their evolutions are systematic.In Damintun sag,there are appropriate coupling-matching associations among burial histories,heat flow histories,histories of hydrocarbon generation and the process of overpressure evolution.Compaction disequilibrium or hydrocarbon generation is main controlling factor of different phases for the development and evolution of overpressure.The overpressure is the force of hydrocarbon migration and can offer the pathway of oil/gas migration and improve the expelling efficiency of high-waxy oil.Furthermore,it causes the formation of mud diapir and is the pressure confining beds for the underlying oil and gas accumulation.
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