阜康凹陷二叠系多成因机制地层异常高压预测方法研究与应用

Research and application of prediction method for abnormal high pressure in Permian polygenetic mechanism formation,Fukang sag

准噶尔盆地阜康凹陷深层勘探程度低,异常高压发育,成因机制多样,传统的钻前地层压力预测方法精度低,难以满足深层油气钻探工程需求。为此,通过分析该区域地层异常高压成因,根据不同高压成因引入地层压力成因修正因子对原伊顿公式进行改进,并建立三维地层压力预测模型。该方法在钻前地层压力预测中应用结果表明,其预测精度达到90%以上,能够满足油气勘探中深层或超深层地层压力预测精度需求。

The deep exploration degree of Fukang sag in Junggar Basin is low,abnormal high pressure is developed,and the genetic mechanism is diverse.The traditional prediction method of formation pressure before drilling has low accuracy,which is difficult to meet the needs of deep oil and gas drilling engineering.Therefore,by analyzing the formation abnormal high pressure in this area,this paper introduces the formation pressure origin correction factor to improve the original Eaton formula according to different high pressure causes,and establishes a three⁃dimensional formation pressure prediction model.Applying this method to the prediction of formation pressure before drilling,the results show that the prediction accuracy is over 90%,which can meet the demand of prediction accuracy of deep or ultra⁃deep formation pressure in oil and gas exploration.