Characteristics And Evaluation Of The Interlayer Of The 3-6-18 Lotus Oil Layer In Liaohe Oilfield

The study area is 3-6-18 blocks high in Gaosheng Oilfield.The oil-bearing layer is alotus oil layer.It is a thick layer of thick heavy oil reservoir with an oil-bearing area of about 1.16km~2 and a geological reserve of 1323.3*.10~4t,the recovery factor was14.6%.The first mining began in 1977,and the steam stimulation method was adopted in 1987.In recent years,due to the characteristics of reservoir geology,the yield is not high and the recovery rate is low.Therefore,fire-driven mining will be adopted,and the distribution of interlayers in the oil layer is an important factor affecting the development of fire flooding.Firstly,based on well logging data and core data,a comparative comparison skeleton section of small wells was established.The re-division and comparison of small layers were carried out in the whole area by using the cyclical control under the control of the marker layer to analyze the structural morphology of the reservoir.Then,according to the core data,logging data,logging data,etc.,based on the principles of petrology and sedimentology,analyze the reservoir sedimentary structure and particle size distribution characteristics,determine the sedimentary environment of the study area,and carry out the division of sedimentary microfacies.The analysis of the single well phase-connected well phase,the layout of the sedimentary microfacies of each small layer is compiled,and the plane distribution law of the sedimentary microfacies of each small layer is determined.In the comprehensive study area,the core data,the core analysis and test data,the oilfield geological profile,etc.,comprehensively apply the theory and method of sequence stratigraphy,structural geology,sedimentology and logging geology,in its theoretical guidance Combined with completed drilling,logging,logging and 3D seismic data,using fine stratigraphic contrast technology,well logging technology identification,geological modeling techniques,etc.,targeted interlayers of 3-6-18 high lotus oil layers Divide and effectively evaluate.Finally,through the analysis results of the reservoir sedimentary microfacies,the distribution law of the interlayer and the spatial modeling of the interlayer,the evaluation parameters are selected,the evaluation criteria of the wells in the study area are established,and the effectiveness of the interlayer is analyzed.It is considered that the wells with small interlayers and thin thickness in the L5 sand group are effective,and the thin interlayer wells of the L6 sand group are more effective.