A Case Study Of Quantitative Sedimentary Simulation With Lacust Rine Fan-delta Knowledge Database:1st South Section In Bell Lake Depression

Sedimentary quantitative simulation is an integrated discipline to improve reservoir detailed characteristics and future to serve complex petroleum characteristics.The core of this method is quantification and simulation technology.It can provide sedimentary body distribution in a given geological time as well as point out sedimentation trend and features in the next stage.As a result,it can provide a relative reliable prediction is sedimentary system distribution and good quality reservoir distribution.Therefore,we study multiple phases fans and inter-structure evolution characteristics of a fan delta sedimentary system in the first section,Formation Nantun,Depression Lake Bell.Lacustrine fan delta prototype establishes on extensive research of Cretaceous outcrop sedimentary profile of Luanping Basin.This study details both periods and superposition relations of delta fan in the first part of South Formation,Wuerxun depression,Hailaer basin,based on logging data,core observation,sedimentary interface grading and architecture elements analysis.This article shows that: Nantun first section develops fan delta front—lacustrine system,in which underwater distributary channel face is dominant and makes up the main body of fan delta front subface;Every period of depositional fan is identified and classified and the relations among them are specified.Fans superposition modes are divided into transgression mode and regression mode along source direction and vertical superposition mode,lateral contact mode and isolate mode cross source direction;Sedimentation simulation operates on outcrop quantified data,sedimentary environment and provenance characteristics following mass conservation principle,considering pale-climate,structural movements,sedimentary supply and lake surface level changes and hydrodynamic force.The most important(8-1~14layers)layers sedimentary process and evolution are simulated.We can see in the result that :fans distribution are effected by source supply and fans geometry are effected by fans sizes.According to fans 3D geometry and size evolution simulation,it shows that fans evolution is strongly affected by hydrodynamic force.Fans seizes first grow bigger and then becomes smaller.Based on outcrop section profile model and fans body distribution relationship simulation,it shows that three different superposition types: vertical superposition,lateral superposition and isolated distribution.Based on reservoir architecture study and channel interior simulation,it is established that three underwater distributary combined types: vertical progressive,lateral progressive and combined channel.The result implies: applying outcrop prototype and comprehensive information both from surface and subsurface to sedimentation simulation;It unveils varies periods fan delta body's exist and superposition relation and turns out to be an effective way in reservoir prediction.