Research On Hydrocarbon Accumulation Characteristics Of Paleogene Reservoirs In Dawangzhuang District Of Raoyang Depression

With the comprehensive research methods of the petroleum geological, geophysical andgeochemical data, this paper gives a systematic research on the oil-gas accumulationcharacteristics, main control factors, petroleum accumulation mechanism of the Paleogene inDaWangZhuang Subtle oil and gas reservoirs.Oil and gas spatial distribution and oil and gasreservoirs liquid properties are clearly pointed in DaWangZhuang district.There are mainlylithologic up-dip pinch-out reservoirs, structural lithologic composite type reservoirs,stratographic reservoirs and structural stratographic composite type reservoirs types of thePaleogene subtle reservoir in Da Wangzhuang area. The most development subtle reservoirtypes are structural lithologic composite type reservoirs and lithologic reservoirs. Onmacroscopic, wing of nosing structure is more beneficial to the high part of structure informing the subtle reservoir. Oil source system and non oil source system can form differentenrichment types of subtle reservoir because of the main factors in forming subtle reservoirs.Carrier system is the key to the formation of Subtle Oil-gas Reservoir. The distributing ofsand body and spatial configuration of fault impacts on the direction of oil-gas migration andpossible space gathered position. Based on the difference in enrichment characteristics andkey factors of subtle reservoirs, there are out-source subtle reservoir forming mode andin-source subtle reservoir forming mode in the area.