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《Progress in Geophysics》 2015-01
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Method of quantitative interpretation of seismic elastic multi-parameter cross plot on effective reservoir prediction in SG gas field

QIANG Min;MIAO Qing-mei;ZHU Wang-ming;LEI Yu;YOU Pei-lin;BAI Yi-nan;Changqing Branch of Geophysical Research Institute,BGP Inc.,CNPC;  
The SG gas field in China belongs to a low-porosity and low-permeability,tight sandstone gas reservoir.There is a large overlap in the acoustic impedance of the gas-bearing sandstone and the surrounding rocks,with no unified interface of gas bearing layers and water bearing layers,restricting the gas productivity construction.Therefore,it is difficult to distinguish between gas-bearing sandstone and shale by the acoustic impedance and it is hard to identify fluids.It has multisolutions to use the conventional single acoustic impedance parameter to predict effective reservoir.In order to reduce the ambiguity of reservoir prediction by the conventional single acoustic parameter,improve the accuracy of the effective reservoir prediction,and identify fluids,this paper starts with shear wave logging data,selects the best sensitive elastic parameters to distinguish gas reservoir and shale and different fluids,according to the cross plots analysis of the elastic multiparameter,and obtains seismic acoustic parameter data from pre-stack seismic inversion,and finally it predicts the effective reservoir and identifies fluids by cross-plotting technique between the sensitive elastic parameters of the shear wave logging data and seismic acoustic parameter data based on prestack seismic inversion.The technique for quantitative interpretation of seismic elastic multi-parameter cross plot on effective reservoir prediction in SG gas field has been proven to be effective and practical.Elastic multi-parameter cross-plot technology based on well and seismic data rendezvous longitudinal resolution higher shear wave logging data and lateral resolution higher seismic prestack inversion.It reduces the ambiguity of effective reservoir prediction by the conventional single acoustic parameter.The application and popularization of the elastic multi-parameter cross-plot has improved the accuracy of effective reservoir prediction.
【Fund】: 国家“十二五”科技攻关重大专项“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程(2011ZX05044)”资助
【CateGory Index】: P631.4;P618.13
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