The Braided River Flume Simulation Experiment And The Design Of Reservoir Geological Knowledge Base

Ng6³⁺⁴ in the west 7^th block of Gudong oilfield belongs to braided river deposition.As a main oil-bearing formation,Ng6³+4+4 developed channel bar sand body.The development of the reservoir has entered extra high-water containing water period.In order to exploiting remaining oil for further,we need to know clear about reservoir heterogeneity and remaining oil distribution pattern.Sediment physical simulation experiment is an effective method to obtain the reservoir information.It obtained 3D geological data,including outcrop anatomy,modern sedimentary and dense well spacing method.The establishment of braided river reservoir geological knowledge base system to provide comprehensive and reliable geological basis for the establishment of the precise reservoir geologic modeling and residual oil in Gudong oil field late potential.We selected 1.65 square kilometers area in Ng6³⁺⁴ in the west 7^th block of Gudong oilfield as the research subject,and we conducted physical simulation in CNPC Sedimentary physical simulation key laboratory.According to the simulation experiment technology and basic theory,design experimental parameters such as bottom slope,sand composition,time,flow rate,and sand adding volume were designed,We have carried out a deep study on the braided river sediment physical simulation experiment.Based on the results of the simulation experiment,combined with many research methods,we completed the structural design,application design and function design of braided river reservoir knowledge base,and established the braided river reservoir knowledge base system.The main results are as follows:?1?The development of the braided river sand body is symmetrical and balanced from the experimental process and the measurement results.Sand bodies'distribution is symmetrical and the vertical thickening of the sand bodies is balanced.?2?The formation of the channel bar mainly depends on the migration and transformation of flow in the bottom of the river bed.The extension direction of longitudinal bar is paralleled with the main flow direction.The longitudinal bar mainly develops in the middle and upper reaches and the ratio of length to width is large.The extension direction of diagonal bar is oblique crossing with the main flow direction,which mainly develops in the middle of the river and on both sides.The extension direction of transverse bar is perpendicular to the main flow direction,and its the existence time is short.The transverse bar is transformed into longitudinal bar or diagonal bar gradually.?3?Falling-silt seams mainly come from the fine material in the period of flood.Because of the hydrodynamic action,the head and the two wings of falling-silt seams are not easy to be preserved,and falling-silt seams are mainly kept in the middle and tail of the channel bar.High topography,shallow water,weak hydrodynamic force,thick silt layer and long consolidation time enhanced the development of falling-silt seams.?4?We summarized about the quantitative relationship between length and width of the channel bar,width and thickness of the channel bar,channel bar width and braided channel width.The results of analysis indicate that the ratio of length to width of the channel bar is mainly from 2:1 to 5:1,the ratio of width to thickness is mainly from30:1 to 50:1,the ratio of width of the channel bar to width of the braided channel is mainly from 3:1 to 5:1.?5?The braided river reservoir geological knowledge base data mainly from outcrop anatomy,modern sedimentary,flume simulation experiment,dense well spacing and reference.According to the data sources,we design and establish the reservoir structure database system in outcrop base,modern sedimentary base,flume experiment base,dense well spacing base and reference base.?6?Reservoir geological knowledge base system is mainly divided into the foreground knowledge base information sharing system and background knowledge base management system.The main function of foreground are inquiry,statistical analysis and display of all kinds of geological knowledge information.The background realizes the functions of adding,modifying and deleting the data of different sources.The foreground of Flume Experiment base mainly displays the experimental program,pictures,measured data,statistical data and related literature of the Flume Experiment.The background of Flume Experiment base realizes the functions of adding,modifying,deleting,input and output of the Flume Experiment.