The applications of wide azimuth seismic technique

Abstract

wide azimuth seismic is a kind of 3D seismic data ac quisition-processing technique with the ratio between horizontal and vertical receiver unit is greater than 0.5.Wide-azimuth seismic technology that is horizontal and vertical receiver receiving unit cell size greater than 0.5, the size of three-dimensional seismic acquisition and processing technology. Since wide azimuth seismic with the whole distribution of azi muth angle,the distribution of geophone offset is uniform from small to large,thus wide azimuth seismic data contains more wealth information, help Identification micro-structure、 small fault and high-angle fracture. This paper describes the application of wide azimuth seismic data acquisition -p rocessing technique in Luo 42 area of Jiyang depression、well Shang 741 field and Well Zhuang 1 field in Moxi zhuang of middle Junggar Basin,and comparative analysis the effect of prediction shale fracture re servoir、prediction igneous rock fracture zone or describes sand in Well Zhuang 1 field by wide azimuth seismic data,find:Wide-azimuth seismic characteristics of the study has anisotropism strong ,the ef fect is obvious when the geological targets with strong anisotropism and heterogeneity characteristics ,However, when the geological target sand body is the reservoir medium such as sandstone and anisotropism obvious characteristics, th e recognition of the sandstone and the physical parameters of the retrieval accuracy by wi de azimuth seismic data,is no t higher than the narrow-azimuth seismic.Therefore,suggest need not wide-azimuth seismic acquisition when the exploration targets without significant anisotropism c haracteristics.