波动方程模型正演岩性油气藏波场研究

The characteristics of wavefield and lithological reservoir using wave function forward modeling

中国石油天然气股份有限公司勘探开发研究院西北分院,甘肃兰州 730020

Northwest Geological Institute, China National Petroleum Corporation, Lanzhou 730020, China

隐蔽油气藏的勘探难度很大,原因是人们对隐蔽油气藏认识还不深入,对其独特的地震波场特征还不甚了解,以至于很难采用常规处理技术和解释方法来寻找这类油气藏。为此,试图通过波动方程模型正演技术来揭示这类油气藏的地震波场响应特征。具体方法是,将理想化的透镜体模型抽象为薄板地质模型,用全波场波动方程数值模拟技术模拟、研究和分析此类岩性油气藏边界点(常为岩性突变点)的地震波场响应特征及其它地震波场响应,或利用特殊岩性体的特殊地震响应来解释和识别相应的岩性边界界限,取得了对这类油气藏波场特征的新的理论认识。

The subtle reservoir is very difficult to explore because of unknowing the characters about unique seismic wavefield. So it is difficult to explore the reservoir using the general seismic processing technique and interpretation method. We try to discover the seismic wavefield responding characters by seismic forward modeling. We use to theoretical model of sandstone lens body, transform to thin plate modeling. By analyzing the seismic wavefield response character and other with full wavefield wave equation numerical modeling, and by identifying lithology edge by the special seismic response of special lithology, new theoretically recognition about the wave-field character in this reservoir is obtained.