Reservoir Sedimentary Architecture Analysis And Modeling In Baikouquan Formation Of Bai21 Block

Bai21 block is an important operation region in the Baikouquan oilfield in northwestern Junggar Basin,which is characterized by widely alluvial fan deposits.Longterm waterflood development residues considerable oil and gas in individual configuration unit at various levels in the reservoir.The reservoir configuration of alluvial fan is very complex,controlling the distribution of residual oil in the reservoir.The reservoir architecture pattern of alluvial fans is extremely complex,controlling the distribution of remaining oil in the reservoir.Therefore,to study the distribution of remaining oil and improve oil recovery,it is necessary to establish a model of the overall reservoir architecture.In recent years,the development of the Triassic Baikouquan Formation in the Bai 21 Block has been increasing,and the area is increasing.The Baikouquan Formation reservoir was re-recognized.In view of the current low production capacity,the unclear understanding of the reservoir architecture of alluvial fans and the unclear distribution of remaining oil,the sedimentary architecture characteristics of the study area have been studied in detail through high-resolution sequence stratigraphy.The principle is combined with geological data and data to establish a high-resolution sequence stratigraphic framework.Under this premise,phase markers such as core facies,sedimentary structures and well logging curves are identified to determine the type of sedimentary microfacies;The sedimentary facies of the phase and the well are analyzed to study the evolution law of the sedimentary microfacies,and the alluvial fan deposition model and phase distribution of the study area are analyzed.On this basis,the alluvial fan deposition system of the Bai 21 Block is dissected,and at the same time,combined with other geological data and data to construct the reservoir architecture model,the quantitative relationship of the various structural elements of the reservoir is analyzed,and the architecture of the reservoir is dissected according to the obtained analysis results.The reservoir architecture model of the Bai 21 Block was established.Provide scientific basis for the development of Baikouquan Group in Bai 21 Block and guide production practice.Through the provenance analysis,it is believed that the sediments in the Bai 21 Block are controlled by the Bai-Wu and Ke-Hundred-Fractures,so they exhibit the characteristics of multi-source control and are divided into four facies according to the hydrodynamic characteristics: the trough flow zone,The turbulent zone,the zonal zone and the runoff zone;in the flow direction along the water flow,the division features of the phase zone are very obvious: the main channel debris flow and the sheet flow glutenite body are developed in the block root,and the block is superimposed and distributed.The near-end shale boulder body and the high-energy turbulent channel in the fan are stacked in a nearly continuous arrangement,and the distal turbulent channel in the fan is isolated;in the lateral direction,different architecture units are superposed and composited.The overall architecture mode is very complicated: the sheet flow glutenite bodies are spliced together in the lateral direction,and the whole side is contiguous,and the lateral transition is a turbulent water channel,which overlaps with the high-energy turbulent water channel and laterally contacts the low-energy water channel.Based on the results of the architecture analysis,the 3D geological model of the Bai 21 Block was established by using the theoretical guidance of stochastic simulation,and the distribution of remaining oil was analyzed.