Reservoir Characteristic Research On Yan 10 In Gao Miao Wan Of Shaanxi Yan'an Northwest Slope Group

The study area wells located in the Northwest Ordos basin in Northern Shaanxi slope.The to the latest achievements of sedimentology,structural geology,petroleum geology,logging geology,mathematics and geostatistics theory,with the modern computer technology and various geological software as a means,drilling,logging,well logging,oil and other kinds of dynamic and static data,laboratory analysis and formation test data,the Shanbei slope northwest Gao Miao Bay reservoir layer research is carried out.The dynamic and static data of the study area 90 wells and adjacent areas in some wells as the main research object.On the study area of Jurassic Yan'an formation,structure,sedimentation,reservoir set feature layer,producing reserves,and further suggestions were studied.According to the principle of stratigraphic correlation,the key strata is mainly studied in the lower middle Jurassic Yan'an formation of Yan 10 reservoir group.According to the sign layer and sedimentary cycle will be extended further divided into 10 segments,and Yan 101 and Yan 102 reservoir group.The regional structure performance is high in the West and low in the east of the monoclinic structure,the gradient for 5?7m per kilometer,and Ordos basin regional structural trend anastomosis.On the horizon of Yan 10 reservoir is meandering river facies.Meandering river is the bending of single river,the river twists and turns,the general development of downstream of the alluvial plain and delta facies and braided river.The main development channel(channel lag,beach sand dam)and floodplain microfacies.Framework sand bodies as sand deposits in river channel.In this area,the lithology of the Yanan formation of the Jurassic formation is mainly a set of feldspar sandstone,followed by a small amount of sub-feldspar sandstone,sandstone and quartz sandstone.Cements are mainly quartz,calcite,dolomite,followed by iron and feldspar.The strength of rock density is different,the debris particles are mainly secondary garden,part of the park,the degree of sorting is good,some of the medium,the contact relationship is mainly linear contact.Fillings mainly in quartz,kaolinite,followed by calcite,illite,containing iron dolomite and feldspathic,main reservoir space is the primary intergranular pores and secondary pores,the main pore types are intergranular pore,followed by feldspar dissolved pores,intragranular pore,and a small amount of moldic pores.The 10 reservoir of Yan'an formation in this area has strong heterogeneity in the transverse direction,which is manifested in the sandstone thickness,sand/land ratio,as well as the physical properties of the reservoir.Phase distribution of thin and thick belt,the reservoir also appeared the phenomenon of alternating distribution.Yan 10 reservoir to a second ?,? class B.After the final calculations of Yan 10 reservoir geological reserves of oil and gas reserves abundance,oil production of Yan 10 reservoir and the remaining recoverable oil reserves.Then the exploration and development of the study area and make suggestions based evaluation.