| Based on the summarization of previous research results, and on the basis of comprehe-nsive utilization of geological and geochemical, geophysical data., Through analysing theformation tracel geological characteristics, forming conditions and accumulation process ofJin jia, Gao qing and Le an stratigraphic reservoirs in different layer series on the southernslope in Dongying depression to find main controlling factors of hydro-carbon accumulationof basin margin stratigraphic trap on different structural belts.Distribution of stratigraphic reservoir on stratigraphic ultra-denudation zone is mainlycontrolled by distance from source to trap, reservoir physical properties, formation dip, andthickness and quality of cap rock. Oil column height reduce along with the distance increasesbetween reservoir and Gao qing fault and it increases following the magnify of formation dip;Migration distance of oil and gas increases along with the magnify of the reservoir porosity;Thickness and quality enhance the sealing ability of cap rock.Distribution of stratigraphic reservoir on nose structure zone is mainly controlled bystructure ridge, fault activity, sand body’s thickness, lithology and quality of cap rock. Thereare three succession structure ridges controling the path of oil and gas come from Bo xing andNiu zhuang to Jin jia and Le an; Fault activity in accumulation period and the sand’s thicknessin favor of hydrocarbon accumulation.Igneous rock’s sealing ability is better than mudstone.The accumulation of the geological factors grading evaluation scope is established and theweight coefficient is determined according to the data of exploration.Based on Valuating oil-source, passage, trap and sealing, the evaluation criterion standard of stratigraphic trap isestablished on stratigraphic ultra-denudation zone and nose structure zone, then examine thisstandard with exploration practice and point out favorable exploration area. |
