地层压力预测方法及其在南海北部构造－热体制分析中的应用

GEOPRESSURE PREDICTION METHODS AND THEIR APPLICATIONS TO HEAT MECHANISM IN THE CONTINENTAL MARGINAL BASIN,NORTH OF THE SOUTH CHINA SEA

研究了南海北部大陆边缘盆地活动热流体的基本物理参数——异常地层压力，探讨了地层压力的预测方法，分析了声波时差与实测地层压力的矛盾，并采用了综合参数预测的有效方法，从理论上建立正常压实趋势线的数学模型；运用该模型计算了异常压力的下界面和建立了压力囊的断面图；计算并分析了高压顶面压力系数。

The abnormal high geopressure, one of the basic physical parameters of the active heat fluid in the continental marginal basin, north of the South China Sea, have been studied. The effective prediction methods were used after analyzing the contradiction of the sonic transit time and the observed geopressure. The mathematical model of normal compaction trend has been established in theory, which was used to calculate the geopressure coefficient and the sub-surface of the high geopressure and build the cross section of the geopressure chambers. The places favourable for the hydrocarbon accumulation were pointed out by analyzing the geopressure coefficient, gas potential and water potential.