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Study On Fine Tectonic Structure And Favorable Exploration Potential Of Subtitle Oil-gas Reservoirs In Aonan Oilfield At The Southern Part Of Daqing Placanticline,Songliao Basin

Posted on:2023-09-25Degree:DoctorType:Dissertation
Country:ChinaCandidate:F C JiangFull Text:PDF
GTID:1520307361988289Subject:Structural geology
Abstract/Summary:PDF Full Text Request
Subtle oil-gas reservoirs,which refer to oil and gas reservoirs whose traps as well as oil and gas existence are difficult to identify according to existing data and geological theory,are an important part of oil and gas reserves in Songliao Basin and the main exploration target of backup reserves.Influenced by the low development level,poor seismic data quality,and strong reservoir heterogeneity in Aonan Oilfield,so far people have not gained a clear understanding of the main controlling factors and rules for the formation of subtle oil-gas reservoirs,and yet established a reservoir formation model for subtle oil-gas reservoirs in the study area.This paper chooses Putaohua oil layer in Aonan Oilfield as the research object,and studies the geological characteristics of this area under the tectonic and sedimentary evolution of Songliao Basin.Through fine seismic interpretation as well as the analysis about fault characteristics and structural evolution history,this study completes the fine structural anatomy of subtle oil-gas reservoirs.Based on the characteristics of rock electricity,well-seismic reservoir prediction,and sedimentary microfacies research,this study figures out the favorable areas for reservoir development in the block,carries out the analysis of accumulation conditions and main controlling factors,clarifies the characteristics of subtitle oil-gas reservoirs,and establishes the reservoir accumulation model in the study area through a comprehensively study of the structure and sedimentary characteristics.On this basis,this study further carries out the comprehensive classification evaluation of reservoirs,and eventually completes the favorable exploration potential research of the study area.The research results indicate the future development direction of the research area.The detailed research results are as follows:(1)According to the fault development characteristics,the study area is divided into the western slope belt,the central uplift belt,and the eastern gentle slope belt.Based on the tectonic evolution history,the tectonic evolution of the basin can be divided into five stages—two stages of tectonic uplift and three stages of tectonic subsidence.The study area began to take shape at the end of the Late Cretaceous-Nenjiang Formation,and basically took shape at the end of the Mingshui Formation.(2)Based on the well logging,core analysis and laboratory analysis,this paper concludes that the provenance direction of the study area is mainly in the north,where delta plains,delta fronts and pre-delta subfacies are developed.Under the control of paleo-tectonic uplifts,sand body is developed in the delta fronts in the north,while lacustrine facies sedimentary sand body is developed in the south,distributed in NNE or due north to south.(3)On the basis of comprehensively integrating the research results of tectonic,sedimentary and reservoir formation conditions,this study figures out and concludes the types of reservoirs in Aonan Oilfield,that is,the reservoirs in the study area are further subdivided into three major categories and eight subcategories.Among them,the subtitle oil-gas reservoirs are mainly tectonic-lithologic oil-gas reservoirs and fault-lithologic oil-gas reservoirs.The transportation of oil and gas is affected by the distribution relationship among tectonic ridges,oil source fractures and sedimentary sands.Anticline-lithologic transport ridges,fault-lithologic transport ridges,as well as lithologic transport ridges are the preferential migration channels for the filling of subtitle traps of oil and gas.(4)Comprehensively considering the tectonics,sedimentary and reservoir formation conditions,combining nine parameters including fracture development,effective reservoir thickness,sandstone drilling success rate,formation testing strength,permeability,flow rate,porosity,sand body type,and reservoir abundance,this study applies the quantitative evaluation method of cumulative probability as well as qualitative methods,evaluates the reservoir conditions in Aonan Oilfield in an all-round manner,and concludes the three types of potential areas in Putaohua oil layer in Aonan Oilfield,which can be used as a guidance for the evaluation and development of nine favorable target areas.
Keywords/Search Tags:Aonan Oilfield, Fine seismic interpretation, Structural characteristics, Main controlling factors of reservoir formation, Potential evaluation
PDF Full Text Request
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