Study On The Deposit Micro-facies Of Yan9 And Chang4+5 In Hua64 Borefield Of Nanliang Oil Field

Ordos Basin is the second sedimentary basin in China,which was multi-cycle composite basin developing on the basis of the Huabei Craton,whose inner structure was poor and area is about 250000 square kilometers.It was abundance of oil and gas resource that would become a advantage exploit and develop place.Currently,it was regarded as a important target in the future.The Hua 64 district of Nanliang oil field is located in Nanliang town of Huachi Country in Ganshu province,its main oil lays focus on Yan'an Formation (Jurassic) and Yangchang Formation (Triassic).The article did research on the reseivor's geological property furtherly.Through analyzing the last documents,it discussed the acuratly stratigraphic division and comparision about Yan9 and chang4+5 oil-producting interval of the Hua 64 district in Nangling oil field,carried the research of the developing law and attribute about the sedimentary microfacies in the oil-producting,and did the discription of every oil-producting about time-space evolution and distributing feature of the sedimantary system.By means of the exploration ,the paper drawed the following conclutions:Making the marker bed as the leading key and the sedimentary cycle as the gist,we divided the Yan'an Formation into three small layers,it is Yan91,Yan92,and Yan93 from the top to bottom;we divided the chang4+5 into seven small layers,it is chang4+51,chang4+5121,chang4+5122,chang4+5123,chang4+513,chang4+514 and chang4+52 from the top to bottom.Through the recognizations about the plane distribution of the sandy lay,the logging facies analysis of the single well,the logging facies analysis,the field espial,the data of the analysis and experiment ,we considered the Yan9 oil-producting as the deltaplain sedimentary,subscaling into the distributary channel above the water,the natural levee,the floodplain and the flood swamp four micro-facies; the chang4+5 oil-producting was the delta front sedimentary,including the mouth bar,the underwater distributary channel,subsea natural barrier,subaquatic interdistributary embayments four micro-facies.