Evaluation Of Chang 2 Reservoir In Xingzichuan Oilfield

Xingzichuan Oilfield Xing 6050 is located in Ansai,Shanxi Province.Its area is about 37square kilometers.In this study,core data,Identification of mineral flakes,scanning electron microscopy and other analysis methods is used to complete the Chang 2 reservoir of the Yanchang Formation in Xing 6050 well area of the Xingzichuan oilfield,The study is also under the guidance of petroleum geology,sedimentary petrology,and structural geology.The exquisite description and classification evaluation of the reservoir provide theoretical basis for the future development work in the area.according to the results of previous researches,core and logging data were used to conduct strata subdivision and stratigraphic comparison studies,and the basic stratigraphic characteristics and stratigraphic plane distribution of Chang 2 stratum in Yanchang Formation in the study area were clearly defined,an isochronal stratigraphic framework was established;Study area Located in the central part of the Ordos Basin,the overall structural pattern is a west-dipping homocline.the stratum is flat,without faults.Some low-rise uplifts are developed in study area,which has positive impact on the enrichment of oil and gas.we cleared the sedimentary facies characteristics and types by studying and analysing these data,The type of sedimentary facies in the study area was identified as delta plain facies.We analyzed the diagenetic types and features;The diagenesis mainly includes compaction,cementation,metasomatism,dissolution and fracture.Chang 2 reservoir characteristic is low Kongte and permeability.The porosity ranges from 4.44%to 22.87%,the average value is 13.6%,the average permeability is 6.52×10^-3?m²,and the porosity and permeability have a good positive correlation.This paper passes through the study of sedimentary facies characteristics,physical properties,pore structure characteristics,macroscopic heterogeneity of Chang 2 reservoir in Study area.Formulated the classification criteria applicable to Chang 2 reservoirs in this area.Chang 2 reservoir in the study area are divided into four types of reservoirs,which are respectively Type I great reservoirs,Type II good reservoirs,Type III poor reservoirs,and Type IV non-reservoir reservoirs.Type I and II reservoirs of Chang 2^2-1 account for 57.7%of the total area,and the type I and II reservoirs of Chang 2^1-3account for 18.78%among the entire region.