Prediction of Overpressure Contributed Mainly by Structural Compression Using Impedance Inversion in Kuqa Depression, Tarim Basin

作     者：ShiWanzhong ChenHonghan ZhangXiming ChenHuichao 

作者机构：Faculty of Earth ResourcesChina University of GeosciencesWuhan430074China The Academy of Design＆ResearchNorthwest Bureau of PetroleumSINOPECUrumqi830011China 

出 版 物：《Journal of China University of Geosciences》 (中国地质大学学报（英文版）)

年 卷 期：2004年第15卷第3期

页      面：341-348页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 082002[工学-油气田开发工程] 

基　　金：ThispaperissupportedbytheNationalNaturalScienceFoundationofChina(Nos.40 372 0 68and 40 2 380 60 ) 

主　　题：impedance inversion overpressure stack velocity Kuqa depression. 

摘      要：The origin and distribution of formation overpressure have effect not only on hydrocarbon migration and accumulation, but also on technique of drilling well. The study and prediction of overpressure are very important in basin analysis. At present, overpressure is mostly predicted by stack velocity. The process in calculating inter-velocity from stack velocity is very complex and inevitably leads to errors. Especially, this method is not available in the case that structural compression contribution to overpressure occurred. This paper introduces a new method, impedance inversion, to predict overpressure, and the principle is discussed. This method is used to predict the overpressure in Kuqa depression, Tarim basin and as a result, the absolute errors are less than 0.1, and relative errors are less than 5 % for predicted fluid pressure coefficients to the drill stem test (DST) measurements. It suggests that this method can be widely used to predict overpressure in foreland basins.