利用地震资料预测地层岩石抗钻特性参数

地震资料中蕴含着大量的地层信息,通过对其进行分析和处理,可以提取出整个地层剖面上岩石的岩性、相关岩石力学特性以及对钻井工程有用的信息。与其他地层信息资料相比,地震资料除了具有信息含量丰富、连续及成本较低等特点外,在未钻井的探区,地震资料是唯一可反映地下地层信息的数据资料。根据塔里木油田英买力地区的地层特点,利用VSP地震资料及数学上的最小二乘曲面拟合原理,建立了VSP系统校正模型,进而根据室内岩心测试结果和层速度时差校正值,通过相关性回归分析,建立了针对该区块的钻井地层抗钻特性参数评价模型。该模型能更准确地预测地层抗钻特性参数,其预测效果基本达到声波时差测井预测效果,并给出了相应的抗钻特性参数预测曲线。

Prediction formation anti-drillability parameters by seismic data

Seismic data includes a great deal of formation information,which is picked up by analyzing and processing.Contrast with other data,seismic data not only holds plenty rock information,continuity and low cost,but also is the only data reflects underground stratum information in no exploration well area.This article sets up a VSP system revising model through VSP seismic data and the least double-multiply curved surface fitting principle based on the formation characteristic of Yingmaili Structure of Tarim Oilfield.Furthermore,formation anti-drillability parameters evaluating model is also founded by correlation analysis of regression based on core testing result and interval velocity interval transit time revising value.