“Sweet Spot” Prediction Of Permian Lucaogou Formation Tight Oil In Jimsar Depression Of Junggar Basin

Tight oil has gradually become an important part of the petroleum industry,and the prediction of “sweet spot” has also turned into a hot spot in research at home and abroad little by little.Whether in theory or in practical application,the further study on the tight oil “sweet spot” will be of great importance.There are rich reserves of tight oil in Jimusar depression Permian LuCaoGou formation of Junggar Basin,with high value of prediction.This article does research on “sweet spot” in three aspects which are fine structural interpretation on seismic data,analysis on the sensitive attributes of reservoir and seismic impedance inversion.Firstly,fine structural interpretation on seismic data.In addition interpretation of horizons were also given out,then the fault were categorized into three level this area,and different interpretation methods were adopted for different grades in this dissertation.Secondly,analysis on the seismic sensitive attributes.Before the analysis on the sensitive attributes of reservoir,the study on the seismic response characteristics of “sweet spot” in research region were finished using the method of forward modeling.Besides,with the method of cross-hole forward modeling,it was sure that the merits of “sweet spot” in LuCaoGou formation were related to reflection strength and the amplitude of seismic reflection.While according to the response characteristics it's instructive to the extractive attributes from analysis on the sensitive attributes.In this article main categories of seismic attributes and extraction methods were generalized,and attributes optimization of target area were made.Through the composite analysis on selected attributes,lateral range of “sweet spot” area were accurately predicted.Finally,research on seismic impedance inversion were carried out.This dissertation finished marking synthetic seismogram precisely.By using the inversion based on the model,the inversion on the layer of the area was done,clearly depicting the vertical distribution rule and range of “sweet spot”.Through the attainment and conclusion in studying the method of reservoir prediction of “sweet spot”,the space distributing future of beneficial “sweet spot” in this area was precisely described.