基于泊松比模型的横波估算在滨里海盆地东缘T区块的应用

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中图分类号： P315.3+1 文献标识码：A 文章编号：2096-7780（2026）02-0057-12

doi：10.19987/j.dzkxjz.2024-110

Application of shear wave estimation based on Poisson's ratio model in Block T of the eastern margin of the Pre-Caspian Basin

Zhang Yiqiong1，Sun Lianju2），Wang Zhen1），Ji Zhifeng1）， Sheng Shanbo3），Jiang Ren1，Lin Yaping1

1） Research Institute of Petroleum Exploration and Development， CNPC，Beijing 1Oo083， China

2） Beijing Century Kingdo Petroleum Technology Development Ltd.， Beijing 10o029， China

3） China Petroleum （Kazakhstan） AMG Company， Almaty O50o40，Kazakhstan

AbstractThe inversion of pre-stack wave impedance is closely related to the parameters such as incident angle， Pwave velocity，S-wave velocityand density.Compared topost-stack inversion，theinclusion ofbothP-to S-wave velocitiesalows for the derivationof more comprehensive elastic parameters.This enhances theabilitytodierentiate lithologyandhydrocarbon-bearing formations，providinga more accurate foundation for driling decisions.Shear-wave velocity dataareparticularlycritical for pre-stack impedance inversion. However，intheTblock，onlyonesetof S-wave logging data isavailable，and itsreliability isuncertaindue to factors such as mud ivasion.Asaresult，accurately estimating shear-wave velocity especially its hydrocarbon-sensitive variations are a crucial step in elastic parameter inversionforpre-stackanalysis.Giventhecharacteristicsofthe maintargetformations，KT-IandKT-，intheTblock， porous carbonatereservoirs with strong heterogeneity，this studyproposes ashear-wavevelocity estimation method based onanempirical Poisson'sratio model.Thisapproach efectivelyenhances thesensitivityofpre-stack seismicatributes to hydrocarbons.Through test processing，parameters of the Poison’s ratio-based estimation model were selected to the geological conditions of the T Block.A reservoir-sensitive threshold for the uP/νS ratio was identified as 1.8.Based on the uP/νS parameters of KT-I_G formation，the thickness of effective reservoir is predicted.The predicted thicknessis more than 85% consistent with wellverification， which provides a strong support for exploration and evaluation of well location deployment.

KeywordsPoisson’s ratio model; shear wave estimation; pre-stack inversion;sensitive attribute parameters

0 引言

弹性波正演模拟以及叠前地震反演处理需要横波测井资料，通常横波速度 uS 可由长源距声波全波列测井资料获取，但在实践中，存在横波测井数据不准确以及横波测井资料缺乏的问题。（剩余13594字）