摘要
Abstract
The Pinghu Formation in the Pingbei slope belt of the Xihu Sag is greatly affected by tidal action,and thin coal seams are widely developed,which have strong amplitude interference effects on the seismic reflec-tions of the underlying strata and thus make the traditional reservoir prediction methods unable to meet the needs of fine description of the sand body.To effectively improve reservoir prediction accuracy under coal-rich strata,a reservoir prediction method based on the far-offset-trace quasi-Poisson attribute is proposed.Firstly,in view of the development location and distribution characteristics of coal seams in the study area,wave equa-tions are used to finely simulate the seismic response characteristics of sandstone reservoirs under different coal measure strata.Secondly,with the help of the change rule of sand-coal-mud coupling pre-stack gather,the sen-sitive attribute information that can reduce the influence of the coal seams is preferred.Finally,through the in-tersection analysis of the multi-parameter information,this paper proposes the far-offset-trace quasi-Poisson at-tribute,which can effectively reduce the interference of coal measure strata in the reservoir prediction of under-lying strata.The actual data confirms that the far-offset-trace quasi-Poisson attribute can integrate the advanta-geous information of far-offset trace and gradient,well eliminate the influence of strong reflection of coal seams,effectively depict the spatial distribution characteristics of sandstone reservoirs,and provide effective technical support for high-precision reservoir prediction under the strong amplitude shielding of coal-rich strata.关键词
西湖凹陷/煤系地层/储层预测/多参数分析/远道拟泊松比属性Key words
Xihu Depression/coal-rich strata/reservoir prediction/multi-parameter analysis/far-gather Poisson attributes分类
天文与地球科学
