Study On The Reservior Characteristic Of Yan9, Yan 10 Oil-bearing In The Southeast Of Jingbian Area In Ordos Basin

Ordos Basin is the second oil and gas basin,and prominent energy resource base of our country,it presents abundant oil and gas resource,especially the Yanchang formation of Triassic and the Yan'an formation of Jurassic.The Yan'an formation of Jurassic is one of the important oil and gas bearing series of the Shanbei Slope.In the past few years,with the further additional exploration and full development,the oil-bearing area of the Jurassic in Shanbei area is ever increasing and its reserve volum is double increasing,so the Jurassic is one of the important replace sets of this area in the days to come.The tectonic activity is feeble in Ordoa Basin,and the Jurassic petroleum deposit is affected and restricted by the sedimentary facies,the reservoir distribution and the physical property of the reservoir,so the research of sedimentary feature,physical property,reservoir evaluateratin and the dominate element of reservoir built-up of the Yah'an formation is very important.Based on collecting correlated datum and referring abundant digest,background based preexisting datum such as well drillin,well loggin,drilling core,laboratory test datum,this paper utilizes the theories and means of stratigraphic geology,sedimentolog,reservoir geology, petroleum geology,logging geology,comparison and division the Yan 10 and Yan 9 formations in the southeast of Jingbian area,further divides the Yan 9 formation into Yan9~1and Yan9~2,and establishing some longitudinal and transversal stratigraphic correlation sections.By surveillance the typical sections,description drilling core and abundant logging datum,analysis systematically the sedimentary feature,sedimentary facies forms of the Yan 10 and Yan 9 oil-bearings,we think that the Yan 10 oil-bearing is braided river facies and the Yan 9 oil-bearing is deltaic plain subfacies.On the basic of observation drilling core,laboratory test datum,we studied the reservoir characteristic of Yan10 and Yan 9 formations,and think that the reservoir rock is feldspathic sandston,feldspathic quartzite,lithic arkose typically.The pore form is primary origin intergranular pore chiefly.The porous and permeation property is approved generally,and it is mesoporosity,high permeability integrally.The physical property of the reservoir is affected by the rock type,rock size and the fragment components.According to the physical property of the reservoir and the pore structural character,we assort and appraise the reservoir of the Yan 10 and Yan 9 oil-bearings.By analysis the geological regular on coccealing of Yan 10 and Yan 9 formation, combination the research of sand bodies distribution,reserveoir characteristic and structural characteristic,we optimize targets as the favorable areas of the next exploratory.