利用地震资料研究江汉盆地白垩系盖层排替压力

Research on the displacement pressure of Cretaceous Caprock in Jianghan Basin by use of seismic data

盖层的排替压力决定了盖层的封闭性质。在钻井较少的地区,可以利用地震资料研究盖层的排替压力。先利用地震资料通过迪克斯(DIX)公式计算出层速度,然后转化为声波速度与排替压力的相互关系,再将校正后的地震速度取代声波速度即可计算出排替压力值,为江汉油区白垩系勘探新油气田提供科学依据。

The caprock displacement pressure decides its sealing character. Seismic data is usually used for researching caprock displacement pressure in the areas where have few drilling wells. By use of the seismic data,first we calculate the interval velocity by DIX formula,then transform it into the relationships between acoustic velocity and displacement pressure. And then we replace the acoustic velocity by corrected seismic velocity,and calculate displacment pressure,which provides some scientific basis for new oil and gas fields exploration in Cretaceous formations of Jianghan Oil Region.