Paleogene Geological Characteristics And Oil-gas Pool Formation Of Northern Kendong Salient

Northern Kendong is located in the epicontinental sea of northern slope zone in Kendong uplift,this zone has found multiple oil-bearing series in the Shahejie Group,Dongying group of Paleogene and the Guantao Goup of Neogene and so on,is a compound oil and gas accumulation zone.It has submitted to the reserves of 8900000 tons of Paleogene,.It recently drilled Kendong 88,89,893 wells to obtain high-yield industrial oil flow,showed the great potential of exploration.It has guiding significance on exploration practice in this region to do systematic research on geological characteristics of Paleogene and accumulation conditions of oil and gas.This paper searches with basic date such as seismic and drilling data,using rich seismic,logging,core and analysis of laboratory test data,to do deep research on the struckture stratum development characteristics,Distribution of sedimentary reservoir,and the main control factors of hydrocarbon accumulation system,made the achievements :First,The tectonic evolution is controlled by the control and influence of regional stress field and activities of the Tan Lu fault zone,experienced a translation from the strong tension,weak strike slip of Paleogene to the weak extension,strike slip of new tectonic movement stage.The high structures in this area are produced by extensional tectonic,its boundary faults to do extensional activities during the paleogene.A transtensional fault activity often cause uplift.Second,The high activity period of the main faults appeared in four and three period of shahejie group,and then presented decline trend of the activity,during the first period of shahejie group,appeared a common phenomenon that activity slightly increased,fault activity tended to stop during the Dongying group.In this area,Cenozoic tectonic evolution experienced limited rifting stage during the Kongdian group to four period of shahejie group,strong rifting stage during four and two period of shahejie group,weak fault depression stage during the three period of shahejie group to Dongying period and weak extension stage of Neogene.Third,Had explicated the main sedimentary phase types and the develop regulations of erevry period of Paleogene.Concluding through analysing single well phases,there are five main sedimentary phase types developed in shahejie group and dongying group in this area,such as fan delta face,carbonate bank dam face,sandy beach dam face,shore shallow lake face,semi deep lake face.Forth,Paleogene of Kendong area reservoir types are mainly structural reservoir,the second is stratigraphic reservoir.The vertical distribution of the reservoir is controlled by development of stratum and regional cap rock.planar distribution is controlled by tectonic background and stratigraphic strip regulation.According to the differences accumulation of different structural belt,setting up the a convex slope "unconformity-fault migration type" of oil and gas migration and accumulation mode.