利用地震资料研究盖层及其封闭能力

The method of studing caprock and its sealing ability with seismic data

1. 大庆石油学院, 大庆 151400;2. 大庆采油九厂, 大庆 163853

Daqing Petrolcum Institute, Daqing 151400

本文在深入研究盖层岩性及其封闭机理的基础上,通过盖层在地震剖面上特殊反射特征的分析,以及盖层排替压力和地层压力与地震层速度之间函数关系的确定,建立了一套在地震剖面上预测厚盖层空间分布及利用地震层速度在平面上研究盖层物性和压力封闭能力的方法。实例研究结果表明,利用地震资料研究盖层及其封闭能力不仅在理论上是可行的,而且可为盖层评价提供更多的信息,使盖层的评价结果更加可靠。

Based on studing deeply the lithology and sealing mechanism of caprock, we establish amethod of foreeasting the spatial distribution of eaprock in seismie seetions and evaluating theeapillary and pressure sealing ability of eaproeks in the plane, through an analysing the specialreflection characteristies of caprocks in seismie sections and determing the relationship between thedisplaeoment pressure or abnormal pore fluid pressure of caprocks and its seismic interval veloeity.The results of our study with aetual data indieate that the suggested mothod is practieable intheory and ean provide a lot of information for the evaluation of caprocks. And as a result, theevaluated results are more trustworthy.