Research On Seismic Prediction Method Of Buried Hill Reservoir In Yidong Area

There widely develops many complex buried hills in the Yidong area,development series of strata including Archaean group,upper Paleozoic and Mesozoic.In the Shengli Oildom,most wells whose production is greater than a thousand kilotons are buried hill reservoirs.Outside the proven reserves area still remains many oil yielding points.No matter from the series of strata or the patterns,exploration of buried hill remains wide prospects and further exploration space.Considering the difficulties in studying complex buried hills reservoirs,based on deep analysis of complex geological characteristics and seismic response characteristics of buried hills,the seismic depiction and prediction method research are developed,thus could the ability of identifying the buried hill reservoir is improved,seismic prediction technology of the buried hill reservoir is established,a set of methods and procedures of edge detection and reservoir space distribution depiction of buried hill reservoir is formed.In the seismic data processing of buried hill reservoir,the three-dimensional structure smooth filtering technology has been studied,then the data has been processed,compared and analyzed.To calculate more accurate stratigraphic dip for the layer flattening in frequency domain,not only an algorithm of stratigraphic dip estimation in frequency domain have been introduced and improved,but also a set of procedures of layer flattening on the basis of dip searching in time domain and dip estimation in frequency domain have been summarized.After that,models to conduct experiments have designed and analysis have been compared.This method is applied to real seismic data.In the seismic prediction method based on dip-scanning,considering the difficulties in buried hill reservoir study,the amplitude variation technique,edge detection technology,etc.,have been mainly studied.Then experiment models have been designed and compared analysis has been conducted.In the end,those methods have been applied to real seismic data to analyze the result.The study shows that different methods can accurately describe seismic edge,and the effect for different types of reservoirs is different.Therefor,these methods are complementary to each other.In describing buried hill reservoir,the method of three parameter wavelet transform has been studied.Model and practical applications show that this method can obtain seismic frequency division data body with better time-frequency focusing.The spectrum fitting absorption attenuation attribute technology has been developed by combining three parameter wavelet transform with the absorption attenuation attribute.Based on the comprehensive research,the seismic prediction method of buried hill reservoir has been built,and the reliability of describing buried hill reservoir has been improved.