异常地层压力成因分析及地震预测

Abnormal Pressure Origin Analysis and Seismic Prediction

地层压力对烃类的生成、运移、聚集均有着极为重要的影响,它是评价油、气藏形成条件不可缺少的资料。地震压力预测是以地震速度分析为基础,以地震速度的分布特征预测地下流体压力分布,在平面上具有独特的优越性,因而具有良好的应用前景。本文以东营凹陷西部沙四上亚段为例,分析了异常压力(主要是异常高压)的形成机理,详细阐述了异常地层压力预测模型的建立过程,通过地层有效应力计算进行孔隙流体压力预测,并对预测结果、误差校正及应用前景进行了讨论,在理论与实践上都有一定的借鉴意义。

The formation pressure has a great influence on the hydrocarbon＇s production, migration and accumulation, which is the indispensable data to evaluate oil/gas reservoir forming condition. The seismic pressure prediction is based on seismic velocity analysis. This is through the distribution of seismic velocity characteristic to predict the distribution of underground fluid pressure. It has the unique superiority in the plane, so that it has the potential application prospect. Take Es4 member in Dongying sag for instance,thesis analyzes the formation mechanism of the abnormal overpressure and elaborates the process of building abnormal formation pressure forecast model. Carries on the porosity/fluid pressure through the stratum stress calculation to forecast that, and to discuss the results of forecast, the error correction and the application prospect, and all has certain model significance in the theory and the practice.