A Study On Chang 6 Oil Enrichment Regularity In The PX Area Of Ordos Basin

In order to study the oil enrichment regularity of tight reservoir in the PX area of the Ordos Basin,the Chang 6 tight reservoir in the PX area was used as the research object.Using the knowledge and methods of geology,well logging interpretation,sedimentology,oil and gas reservoir evaluation techniques,and indoor analytical chemistry experiments,the strata of the study area 6 were finely divided and compared,and the characteristics of reservoir sedimentary microfacies and diagenesis were studied.The characteristics and reservoir characteristics are studied.Based on this,the reservoirs are classified and evaluated.Finally,the accumulation rules of the Chang 6 tight reservoirs in the PX area are analyzed and summarized to provide scientific and rational development of the Chang 6 tight reservoir in the PX area.Geological basis,and guide the production of oil fields.It provides geological basis for the scientific and rational development of the Chang-6 reservoir ultra-low permeability reservoir in the PX area and guides the production of the oil field.Through this study we have obtained the following understandings:First,the reservoir delta sedimentary system developed in the Chang 6 reservoir,and the underwater distributary channel sand body is an advantageous reservoir for the reservoir development.The development of the sand body in the study area is controlled by the sedimentary microfacies.The thickness of the sand body close to the provenance area is relatively large.The average thickness of the Chang 6₁ sand body is the longest,Chang 6₂ is longer,and the longest is Chang 6₃.Second,The classification and evaluation of reservoirs indicate that Chang 6₃ reservoirs in PX area are dominated by reservoirs of category III and IV,and their overall properties are poor;reservoirs of Chang 6₂ are dominated by reservoirs of category II and III,and overall physical properties are poor;There are many types I and II reservoirs in the reservoir and the overall physical properties are good.Third,The enrichment of oil and gas in the PX area is mainly controlled by the source rock conditions,trap conditions,sedimentary microfacies and sand body distribution characteristics,oil sand body monolayer thickness,reservoir physical properties and diagenesis.