| In this paper,the main research objects are chang6i,62and63of chang6formation in theeast of Ansai oilifeld,based on core analysis and outcrop observation,with the methods andtheoires of sedimentary,sedimentary petrology,logging geology,reservoir geology and othertheoires,previous research results of the study area,analysis regional geological backgroundand depositional setting,make the stratigraphic division and coenocorrelation of chang6oillayer in the study area,summing up petrological characteristics,fossils,marks of electro&ciesand other marks, divided the sedimentary facies again.Over the analysis of the dirlling andlogging data,combined with the test technology such as core description,electron themicroscope and mercury analysis to describe the characteristics of reservior,mine whileanalysis sedimentary microfacies control to reservoir.Through the research,the study area is located in Erdos Basin North Shaanxi slope,strataundulation is smal1,stratigraphic correlation of each layer found that strata is stable and havelittle thickness vairation.Make clear that study area mainly developed delta depositionalsystem of delta rfont subfacies.Development of microfacies are underwater distirbutarychannel, mouth bar, subsea interdistributary bay, subsea natural barrier,rfont sheet sand and soon.The sand bodies are underwater distributary channel sand body, mouth bar sand body andthe two mutual stacking sand body.From chang61tochang63, property gradually becomespoor， mainly developed small pores,rock interaction have influence on poresrructure.Properties and oil-bearingof the reservior sand body is mainly affected by thecombined effect of direction of suoce,sedimentary facies and diagenesis，the main controlfactors is sedimentary facies,forned a large number of secondary pore. Sedimentary facies haveobvious control on reservior Chang6formation are mainly lithologic oil and gasreservoirs,small nose structure also have certain effect. |
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