基于超压成因机制的压力预测方法与应用  

Pressure Predicting Methods Based on Overpressure Genetic Mechanisms and Its Application

作　　者：景琛 JING Chen(The First Gas Production Plant of Huabei Company,Sinopec,Zhengzhou,Henan 450006,China)

机构地区：[1]中石化华北油气分公司采气一厂,河南郑州450006

出　　处：《测井技术》2018年第4期460-465,共6页Well Logging Technology

摘　　要：在等效深度法和Eaton法适用条件及压力预测各环节误差分析的基础上,探讨了预测参数的优选方法以及预测方法选择的依据。超压成因机制是压力预测方法优选的最主要依据,等效深度法主要适用于欠压实成因超压预测,Eaton法适用于多种成因超压的预测。对于超压凹陷,通过分构造带优选正常压实趋势线、三段式拟合上覆岩层密度—深度关系曲线以及迭代法确定伊顿指数c值,可以最大限度地减小预测压力的误差。以渤南洼陷地层孔隙压力预测为例,在以生烃超压为主的构造带,采用Eaton法预测误差较低,而在以欠压实超压为主的构造带,等效深度法预测效果较好。Based on the analysis of the applicable condition sand the error of each pressure prediction link of the equivalent depth method and the Eaton method, the optimal methods of prediction parameters and the basis for the selection of prediction methods are discussed. The overpressure mechanism is the most important basis for the selection of pressure prediction method. The equivalent depth method is mainly applied to over pressure prediction caused by under-compact. The Eaton method is applicable to the overpressure prediction by multiple causes. For the overpressure depression, the error of the predicted pressure can be minimized by selecting the normal compaction trend line according to the tectonic zone, three-stage fitting overburden rock density-depth relationship curve and using iterative method to determine the Eaton index c . Taking the prediction of formation pore pressure in the Bonan depression as case study, in the tectonic zone dominated by hydrocarbon generation overpressure, the prediction error is lower by the Eaton method, while the prediction performance of the equivalent depth method is better in the tectonic zone dominated by under-compacting overpressure.

关 键 词：压力预测 等效深度法 Eaton法 预测参数优选 超压成因 渤南洼陷 

分 类 号：P631.84[天文地球—地质矿产勘探]