地层压力预测方法及其在莺歌海盆地的应用

GEOPRESSURE PREDICTION AND EVALUATION METHODS AND ITS APPLICATION IN YINGGEHAI BASIN

研究了压力预测的方法，推导地震声波时差差值－压力梯度法的计算公式并指出它的优点是能够充分利用已知的钻井实测压力资料；从理论上分析了正常压实趋势线的性质和形态，并用2－3次多项式和分段函数建立正常压实趋势线；根据莺歌海盆地高温高压及沉积速率高、泥底辟发育的特征，建立合理的压实趋势线，并用声波时差差值－压力梯度法预测了莺歌海盆地的压力分布。

The methods of geopressure prediction are appreciated in this paper, The results show that seismic internal transit time deviation-pore pressure gradient convertion take advantage of the known pressure data(RFT). Analysis of the feature and geometry of the normal compaction trend is used to establish the compaction trend with polynomial of degree 2 or 3 or polygonal line, and to predict the distribution of geopressure using the method of seismic transit time deviation-pore pressure gradient in Yinggehai basin with the characteristic of high temperature, high geopressure, high depositional rate and development of mud diapir.