摘要
Abstract
Aiming at the problem of"sweet spot"prediction in tight sandstone reservoirs caused by special lithological components,taking the Paleogene reservoir of an oilfield in the South China Sea as the research object,a study on the"sweet spot"prediction technology for reservoirs under the composite influence of cal-careous and tuffaceous components was carried out.First,a multi-mineral petrophysical model was con-structed based on the differential effective medium theory,and the longitudinal wave velocity,shear wave velocity,and density response characteristics of the exploration wells in the study area were obtained through forward modeling.Then,the multi-dimensional response relationships between elastic parameters(such as P-wave impedance,S-wave impedance,density,P/S wave velocity ratio,and Poisson's ratio)and shale content,calcareous content,tuffaceous content,and porosity were systematically analyzed.A complex lithology interpretation template based on elastic parameter crossplot analysis was established.Finally,com-bined with pre-stack simultaneous inversion technology,the three-dimensional spatial characterization of tight reservoirs(such as calcareous sandstone and tuffaceous sandstone)and high-quality reservoirs was achieved.The research results show that the sensitivity analysis of elastic parameters based on seismic petro-physics can effectively clarify the petrophysical response mechanisms of lithology and physical properties in complex lithology reservoirs,and can provide a reliable technical path for sweet spot prediction in tight sandstone reservoirs.关键词
岩石物理模型/岩石物理/致密砂岩/微分等效介质模型/叠前同时反演Key words
rock-physics model/rock physics/tight sandstone/DEM model/differential effective medi-um model/pre-stack simultaneous inversion分类
能源科技
