Study On Sedimentary Characteristics Of Lower Es₂ In Xinlicun Oilfield

Xinlicun area is located in the eastern central uplift belt of Dongying Depression,Yonganzhen oilfield on the north(collectively called Yongxin region),Guangli oilfield on the south,Qingtuozi Heave on the east,and Niuzhuang sag on the southwest.This area is a typical complex fault block oilfield.Recent years,the Xinlicun oilfield is one of the highlight oil-gas exploration and development blocks at Dongxin Oil Production Factory in Shengli Oilfield,and its major oil-bearing stratum is Es2.Based on the guide of sequence stratigraphy,sedimentology,petroleum geology and other relevant theories,and by means of comprehensively applying the practical data of core,thin section,analysis test,seismic interpretation,logging,well logging and so on,the paper conducts a study on stratum development features,provenance system,sedimentary characteristics,sand body distribution of the objective layer,and eventually establishes the sedimentary facies model of the study area,which has significant meanings on exploration,deployment and development of oil and gas.Es2 research can be divided into two long-term cycles,namely two on the sand,the sand under two.Objective horizon for the next two sub-sections of sand,and divide by the fine stratigraphic correlation,further divided into nine short-term cycles of sand Second,the study shows that the Second Sand Village section of the new legislation met deltaic region's major sedimentary and shallow lake phase,the top of cycles also fluvial facies.Provenance study area,mainly from the northeast Qingtuozi raised,oil sands northeast and southwest direction gradually southward advance of the study area due to the overall fault many and complex,most of the well layers development is not complete,the formation of off losses,In establishing stratigraphic framework even well section,select the well became a difficulty in log lithology logging features and comparative work area more than 100 wells,the establishment of four profiles cover the whole area.Some wells in the fault can not be selected,leading to development of sedimentary facies distribution control is not ideal,the existing data can not be judged by the most original depositional environment,suggesting thatlarge errors.By lithofacies flag logo sedimentary structures,logging phase signs with signs,combined with particle size analysis,identify the group Sec Shahejie Formation in the study area is mainly sedimentary facies types,namely former fluvial,delta plain,delta edge subphase(underwater distributary channel,mouth bar,between the river sedimentary microfacies),the former delta and lacustrine phase.