修正地层压力预测模式提高预测精度

地震钻前压力预测是利用地震的速度资料计算地层压力。根据压实原理,超压层或过压力层通常与高孔隙率伴生,因此也就与地震低速度异常相对应。利用地震方法预测超压层的存在并估算其压力,为钻井工程提供参考数据,这对无钻井资料可提供的新探区极为重要。文中对层速度和平均速度的经验公式进行修正,并结合牙哈地区的地震资料进行了验证。

IMPROVE PREDICTION ACCURACY WITH THE CORRECTION OF FORMATION PRESSURE FORCAST MODE

The seismic predrilling pressure prediction is to calculate formation pressure by use of seismlc velocity data. According to the compaction principle, superpressured formation or overpressure always occurs with high porosity. As a consequence, it also corresponds to seismic low - velocity anomaly. It is vital important for new acreages without drilling data supply to predlct the existence of superpressured formation, estimate its pressure by means of selsmic and provide reference data for drilling engineering. This paper corrected the empirical equations of interval and average velocity and verified them in association with the seismic data on Yaha area.