Analysis of internal structure and reservoir-forming conditions of palaeo-buried hill, Western Liaohe Sag

Structural belt of buried hill is a building unit which shows great concentration of hydrocarbon in eastern- China faulted basin, but the research ofthe relationship between buried hill and hydrocarbon trap is still weak. Taking the buried hill belt of western Liaohe Sag as a research target, this paper expounds the internal structure of buried hill and the control action of accumulation from various aspects, including structural framework and active phases of inner buried hill, formation lithologyand attitude, morphological unit classification and distribution framework, trapping types and hydrocarbon source conditions,hydrocarbon migration and accumulation conditions. The hydrocarbon trap is divided into palaeogeomorphology and stratigraphic hydrocarbon of inner buried hill. It establishes the newsource and old reservoir hydrocarbon accumulation that the hydrocarbon migrates fromtop tobottom, then parallel migrates from lowto medium buried hill along unconformable face, at last fills in buried hill and forms the reservoir. The hydrocarbon accumulation model provides references for deep exploration activityofburied belt in Liaohe Sag.