A conceptual model for extrapolating interval velocities of deep layers based on the pressure compartment model

doi:10.11743/ogg20100622

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A conceptual model for extrapolating interval velocities of deep layers based on the pressure compartment model
Vol. 31, Issue 6, Pages: 879-882(2010)
Online First：28 December 2010，

Published：2010
DOI： 10.11743/ogg20100622
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DOI：

A conceptual model for extrapolating interval velocities of deep layers based on the pressure compartment model[J]. 2010, 31(6): 879-882. DOI： 10.11743/ogg20100622.

摘要

对于存在压力仓的盆地，如果压力仓内由速度谱获得的层速度值与钻井的实测层速度值（如:据声波测井获得的值）有很大差异，致使无法用读速度谱方法获得比钻井更深地层的实际层速度值，可以基于“压力仓模型”进行外推得到钻井未达深部的层速度值。外推基本公式是压力仓内地层压力与层速度之间的函数关系。具体方法是，根据这种函数关系，先解出紧邻井底的第一层的层速度理论值，然后再解出紧邻第一层的第二层的层速度理论值，以此类推。

Abstract

In a basinwith pressure compartments，true interval velocity of layers beyond the reach ofdrilling can not be obtained by using velocity spectrum when the velocities obtained from velocity spectrum in the pressure compartments are very different from themeasured velocities during drilling（for example sonic logging）.In this case，the interval velocity of deep layers beyond the reach of drilling can be extrapolated based on“pressure compartmentmodel”.The basic formula for extrapolation can be expressed as the functional relation between formation pressurewithin the pressure compartments and interval velocity.First，the theoretical interval velocity of the first layer beneath the bottom hole is calculated by using the functional relation，and then the theoretical interval velocity of the second layer beneath the first layer is calculated，and the rest can be obtained in the samemanner.