挤压构造地层压力预测模型研究

搞好地层压力预测,能够为钻井参数选择和井身结构设计提供准确的基础数据.针对目前某研究地区MR油田所在地层中存在逆掩推覆构造和挤压构造,已钻入地层中普遍存在异常高压,而其地震层速度和测井声波时差资料都无异常表现,采用常规的地层压力预测方法对该区块进行地层压力预测时会产生很大的误差.分析其原因,主要是挤压构造作用使该地区产生高压.引入相对挤压构造应力和构造压力因子对现有的地层压力预测模型进行了修正,建立了挤压构造条件下的地层压力预测模型.现场应用试验表明,修正的地层压力预测模型大大提高了挤压构造地区的地层压力预测精度.

Research on prediction model for formation pressure in compression structure

During oil exploring and drilling process, it is very important to predict formation pressure accurately, because it can supply pressure technique data for drilling parameter select and well structure design. There are over-thrust folding structure and compression structure in the formations of MR Oilfield, and there exists the overpressure in the drilled formation. However, there are no abnormal expressions in the seismic interval velocity and logging information of interval travel time. There shows serious error using the traditional prediction methods in this block. The effect of compression structure stress is the main reason for producing overpressure. The relative compression structure stress and structural pressure factors were cited to correct the traditional prediction models. The applications of the corrected prediction models on site showed that the predictive accuracy of formation pressure could be greatly improved.