Research On The Fine Reservoir Of Gaotaizi Reservoir In Hua 33 Block Of Songnan Daqingzijing Oilfield

Songnan Daqingzijing Oilfield is located at the periphery of the old Gan'an Oilfield in Qian'an County,Songyuan City,Jilin Province,and includes the qian174-Hei69 well area.The research area is 420 km~2,and the south is Daqingzijing Oilfield.The regional structure is located in the northeast of the Changling depression in the central depression of the south of the Songliao Basin,with the Qian'an structure in the southeast and the Da'an-Honggang terrace in the northwest.After many years of continuous development,Daqingzijing Oilfield has gradually transitioned from a simple fault-structure reservoir to a cryptolithic reservoir with hidden concealed development.It is increasingly difficult to develop,and the optimal and effective sand bodies for oil and gas-enriched areas have been developed.The demand for identification technology is getting higher and higher.As there are many oil-bearing strata in the block,various development contradictions have been increasing.Therefore,with the continuous development of production capacity,the understanding of reservoir types and reservoir accumulation models needs to be continuously improved and updated.The topic of the thesis makes full use of the existing oilfield data,and is guided by theories of structural geology,seismic geology,sedimentary petrology,reservoir geology,and petroleum geology.It aims to serve the fine exploration and development of oil fields and finely divides them into small layers.On the basis of comparison,based on the extensive collection of basic data of the research area and previous research results,it closely focused on the main lines of deposition and reservoir sand body distribution and complex fluid identification,etc.,through structural features,sedimentary microfacies,and tight wells.In the research area,fine sand body characterization and reservoir seismic prediction were studied.In the study area,four types of microfacies,the underwater distributary channel,the estuary dam,the far sand bar,and the underwater diffusive bay of the delta front subfacies,were identified;There are two types of stacked superimposed thick sand bodies and isolated thin interbedded thin sand bodies in the interval;the near source ends are dominated by accumulative superimposed thick sand bodies,and the delta front ends are isolated and thin.The development law of the sand body,which is dominated by layered thin sand bodies,finely describes the distribution characteristics of sand bodies in the reservoir.Based on the results of comprehensive sedimentation,tectonics,and years of development of the oil field,based on the anatomy of the main controlling factors of the reservoir distribution,a Hei 135 sandstone lens body,Hei120-5 steps,Hei160 sandstone lens bodies and Hua33-6-4 micro-structures are selected as favorable target areas.The development of the potential of the oilfield and the adjustment of the next step provide more reliable geological support data.