用地震速度资料进行钻前地层压力预测，大体可分为趋势线法和支撑上覆岩层压力的百分比法。
Methods used in the prediction of pore pressure can be classified into two groups-the method of trend line and the method of percentage of overburden.
运用地层观点对沉积物某种或多种性质变化进行分析，表明这些变化具有规律性并有向一些界限呈单向变化的趋势。
Analysis of variations in single and multiple attributes from a stratigraphic perspective manifests regular organization and unidirectional tendencies toward limits.
吐哈油田自91年投产以来，随着油田的开发地层压力逐年下降而气油比呈急剧上升趋势，特别是温米油田出现了大批的高气油比油井，这给目前采用的有杆泵和电潜泵举升带来了一定的难度。
TUHA oil field has been putting into production in 1991, with the development of TUHA oil field, the reservoir pressure is dropping off, the gas oil ratio(GOR) is quickly rising.
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