Mechanism of fullness degree of lithologic reservoirs in over-pressure system in Dongying sag
WAN Xiao-long~(1,2),QIU Nan-sheng~2,SHI Shuo~3,ZENG Jian-hui~2 (1. Research Institute of Exploration and Development, Changqing Oilfield Companlation, Ministry of Education, University of Petroleum, Beijing102249,China; 3. Changqing Oilfield Company, Xi'an710021,China)
Lithologic reservoirs are developed in deep over-pressure system in Dongying sag. Due to effect of faulting, reservoirs quality and dynamic of forming-pool in this system, different fullness degree lithologic reservoirs are developed. Three models of entrapment of lithologic reservoirs are built, base on comparing systems of hydrocarbon accumulation of lithologic reservoirs with different fullness degree and type. The three reservoir entrapment models are: (1) reservoirs with high oil fullness degree at deep and with abnormal high-pressure, (2) medium fullness degree reservoirs with fault incision and (3) low fullness degree lens reservoirs.