Study On The Method Of Reservoir Prediction Of Qianfoya In Bazhong Area

The main content in his topic is to carry out the precise prediction of Qianfoya tight sandstone effective reservoir in Badong area,crack prediction and hydrocarbon detection,implemented favorable exploration targets and formated technical methods for prediction of Qianfoya oil and gas enrichment zonein Bazhong area.Based onthe analysis of seismic data quality,we are carried out research fromthree aspects : well data processing and analysis,seismic inversion and interpretation and comprehensive prediction of gas bearing reservoir.First,based on the drilling core,cuttings,logging,testing and other data,counteds and analyzed of lithology in Qianfoya's reservoirs,physical properties andthe relationship between them;carried out well logging data processing and interpretation,the logging response characteristics and petrophysical analysis of multi wells,preferably reservoir and oil and gas-sensitive properties.,carried out pre stack AVO forwardmodeling of the key,established geological and geophysical recognition mode of effective reservoir.Secondly based on horizon calibration and structural interpretation,extracted seismic attribute parameters based on pre stack inversion,carried out prestack inversion and AVO attribute inversion,carried out the analysis and interpretation of seismic attribute parameters under the guidance of well logging data analysis and forward modeling,based on the pre stack and post stack datapredicted the distribution of cracks by the method of coherence and curvature.The last is based on well data analysis,seismic inversion and attribute analysis,crack prediction results,according to the geological and geophysical characteristics of Qianfoya reservoir in Bazhong area,toselectrational and effective reservoir prediction method.Combined with the structural and sedimentary characteristics in Qianfoya,according the principle of facies controlled reservoir evaluation,adopted the prediction method is determined to carry outthe comprehensive evaluation of reservoir oil and gas,delineated favorable area of reservoir oil and gas zone,predicted reservoir thickness and distribution characteristics.1.The elasticity parameter analysis indicates that the Zp and Zs attribute pairs are parameters pairs of sensitive sand body in the background of GR.The Vp and Vp / Vs attribute pairs are confirmed as the sensitive parameters pairs of the reservoir in the background of porosity.2.The prediction of sand body and reservoir distribution indicates that the sand body and reservoir in the vertical,The middle and upper sections of the sand and reservoir are relatively developed,while a thousand paragraph takes second place.3.AVO forward modeling shows that the gas-bearing layer is acted as the fourth type of AVO response characteristics;the differential oil and gas layer is acted as the second type of AVO response.4.Crack prediction shows that the fracture is more relatively developed in industrial land spread along the fault direction and the small fault concentrated area.5.The gas-containing distribution predicted that the gas-sensitive characteristics are Poissonratio,fluid factor,AVO intensity and P*sign G.From the hydrocarbon indicator,it was found that the gas distribution is mainly in the underwater branch channel sand body and the main line,Consistent with the reservoir distribution characteristics.6.According to the comprehensive prediction,the useful reservoirs are mostly stored in the middle,middle sections of the second and middle segments have less,and the distribution of the favorable gas zone is in accordance with the regulation of the deposition and each section of the work area's distribution affected by the fault system.Part of the useful zone is mainly distributed among the line;the effective thickness of each interval is 3-16 m.7.According to the comparison of well and seism,the Prestack reservoir prediction fit into the reservoir prediction of Qianfo Clay.