Research On Mud Drape Of Tidal Estuary Depositional System And Multipoint Statistical Modeling

MacKay river oil sands area were transgressed in the low period Manville group,Sedimentary facies in the study area of sea level rise in the process of changing,types and distribution of sedimentary facies reservoirs largely determine the genetic type,composition,structure and macro exhibition bout point,This not only affects the distribution of reservoir and reservoir space,but also influence the evolution of reservoir space,It is necessary to sand and skeleton qualitative or quantitative study sedimentary facies distribution,summarized by sedimentary facies research methods set out McMurray at MacKay river oil sands distribution.Marine sediments and continental sedimentary significant difference,especially affected by tides.The study area for the tide-dominated estuarine sedimentary environment,development estuaries phase.On a plane,on top of a large area of salt marshes,tidal rivers in effect under the influence,develop podiform point bar deposits of sedimentary features estuarine environment,On the vast sand flat development has a pure elongated tidal sand bar deposits of sedimentary environments characterized by outer estuary.Study area is marine sediment,Widely distributed mud drape formed and the thickness of very thin(mm-cm level),need to make a research of causes,types and distribution system in accordance with the form of interlayer,extend the scale,causes,mud drape can be divided into eight different types(type No.A-H).They are sporadic development mud drape,double mud drape,intensive development of mud drape,biological disturbances mud drape,Calcareous mud drape,glauconite containing mud drape,Containing thin layer of sand mud drape,clay oval grain.Work area with class B and class C mud drape.class B sludge is extremely thin skin,stretched far on the core scale,class C mud drape extended stability,class B and class C the presence of mud drape reveals changes in work area of hydrodynamic system.Study area currently used horizontal wells SAGD oil sands mining,reservoir heterogeneity has a large influence,need to establish a reliable three-dimensional geological model of the reservoir characterization of the internal structure of fine.The traditional method of stochastic modeling is often used kriging difference method can not guarantee the accuracy of the model,The study was multi-point statistical modeling method to establish model mud drape provide reference for the post-horizontal wells.