Abstract：The tectonic features in the Block SQW are entirely consistent with the other areas of Sulige Gas Field.There the formations are gentle,structure traps are not developed,and stratigraphic gas reservoirs are developed.Since parameters such as velocity and density of different rocks are very close,the traditional impedance inversion is difficult to identify gas strata in He8.So AVO based on Poisson's ratio is selected in our research,which was proposed by Verm and Hilterman.The original two-dimensional color NI-PR crossplot analysis method can essentially improve the ability to distinguish 3 types of classic AVO anomalies.And this analysis can be applied to seismic anomalies identification.With petrophyscial analysis and the AVO forward modeling in the research area,we get the NI-PR color calibration crossplot and summarized the response characteristics of AVO anomalies.Using color crossplot interpretation to analyze attributes NI and PR,reliable spatial distribution of gas reservoirs is obtained.80.5% of the reservoir prediction results are well matched with the actual drilling data.
