摘要
时移地震叠前资料包含重要的振幅随偏移距变化(AVO)信息,能用于区分不同油藏参数变化及进行油藏定量解释。依据油田实际情况,确定适合计算疏松砂岩纵、横波速度和密度的岩石物理模型,并依据该模型通过求解精确Zoeppritz方程来正演模拟油藏含油饱和度与有效压力变化时的地震AVO响应,分析了利用时移地震AVO反演区分油藏参数变化、实现油藏定量解释的可行性。根据Aki和Richards的简化AVO方程,详细推导了利用岩石物性与地震属性的近似关系进行时移地震AVO反演的计算公式。试验结果表明,在S油田进行时移地震AVO反演是可行的,推导的时移地震AVO反演计算方法能有效地分离油藏含油饱和度和有效压力的变化,真正实现对油藏的定量解释。
The information of amplitude varied with offset (AVO) in pre-stack time-lapse seismic data is much valuable to discriminate variation of different reservoir parameters and to realize quantitative interpretation of reservoir. The petrophysical model for un-consolidated sand rock was determined on the analysis of reservoir conditions. According to the petrophysical model, the time-lapse seismic AVO responses were simulated with the variation of oil saturation and effective pressure by Zoeppritz equation. The feasibility of discriminating different reservoir parameters for realizing quantitative interpretation of reservoir using time-lapse seismic AVO technique was analyzed. Based on the simplified AVO equation given by Aki and Richards, the formula for time-lapse seismic AVO inversion by using the petrophysical model was derived in detail. The simulated data show that the time-lapse seismic AVO inversion is feasible. The formula derived in this paper is effective for discriminating the variations of oil saturation and effective pressure and for improving the precision of time-lapse seismic interpretation.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2005年第3期68-73,共6页
Acta Petrolei Sinica
基金
国家自然科学基金项目(40174037)
国家高技术研究发展计划(863)项目(2003AA6021102)联合资助。
关键词
时移地震
AVO反演
岩石物理模型
正演模拟
储层
定量解释
time-lapse seismic
amplitude varied with offset inversion
petrophysical model
forward model
reservoir
quantitative interpretation
