准噶尔盆地复杂地区地层压力预测方法研究及应用

准噶尔盆地地层压力分布复杂，长期以来由于地层压力预测不准，在钻井过程中常出现井壁失稳、卡钻、井壁坍塌、钻井液漏失等工程事故，严重影响了钻井速度.为减少工程复杂问题,准确预测地层压力至关重要.为此，在准噶尔盆地开展了断层相关褶皱理论解释复杂构造、利用地质构造建模指导速度建模，求出每层的层速度和真倾角，再用Terzaghi 理论计算地层孔隙压力，计算结果证实地层压力预测精度显著提高.

Research and application of the formation pressure prediction method to complex regions in the junggar basin

The character of formation pressure distribution in the Junggar Basin is complex. For a long time because it is not precise to predict formation pressure,there are many engineering accidents such as wall of a well losing steady state,blocking drill,wall of a well collapsing,drilling fluid leaking and so on. For reducing engineering complex problem,it is very important to predict formation pressure truly.Therefor ,we have developped interpreting methods for complex structure by correlative fault fold theory ,instructing velocity model by geologic structure modeling,computing interval velocity and true dips of every layer,and then computing formation pore pressure by Terzaghi theory in the Junggar Basin. The research result proves that the precision of formation pressure prediction is improved remarkably.