CAJ | 학술논문

叠前反演技术已经成为岩性预测和流体识别的关键技术,并将在油气勘探中发挥重要作用,本文提出了模拟退火AVA同步反演方法,该方法以多个角道集地震数据体和先验纵波速度、横波速度、密度模型等为输入,综合利用地震、地质、测井等多种信息为约束,采用模拟退火全局优化方法,直接采用Knott-Zoeppritz方程求解反射系数,同步反演获得纵波阻抗、横波阻抗、纵横波速度、密度、Mu、Lambda等23种岩石弹性参数模型.其主要特点如下:1)采用Zoeppritz方程直接求解,精度高;2)目标函数选择灵活;3)多角度提取子波;4)可获得深度域的反演结果.实际资料应用证明,该反演方法保留了地震反射振幅随偏移距不同或入射角不同而变化的特征,可有效提高储层预测争流体识别精度.实际应用表明,本方法预测结果可靠,具有较强的实用性.
첩전반연기술이경성위암성예측화류체식별적관건기술,병장재유기감탐중발휘중요작용,본문제출료모의퇴화AVA동보반연방법,해방법이다개각도집지진수거체화선험종파속도、횡파속도、밀도모형등위수입,종합이용지진、지질、측정등다충신식위약속,채용모의퇴화전국우화방법,직접채용Knott-Zoeppritz방정구해반사계수,동보반연획득종파조항、횡파조항、종횡파속도、밀도、Mu、Lambda등23충암석탄성삼수모형.기주요특점여하:1)채용Zoeppritz방정직접구해,정도고;2)목표함수선택령활;3)다각도제취자파;4)가획득심도역적반연결과.실제자료응용증명,해반연방법보류료지진반사진폭수편이거불동혹입사각불동이변화적특정,가유효제고저층예측쟁류체식별정도.실제응용표명,본방법예측결과가고,구유교강적실용성.
Prestack inversion has been key technique for lithology prediction and fluids identify.At the same time this technique will play an important role in oil and gas exploration.In this paper,a new method will be present in this paper.In this method,multiple angle stack seismic data,priori P wave velocity,S wave velocity and density etc,have been used for import data.At the same time Seismic,geology and well log information have been used for restraint information.At last We use annealing global optimization algorithm and simultaneous inversion P wave impudence,S wave impdence,density,Mu,Lambdaetc.,23 kinds of rock elastic paramters model.The main unique feature as follows:1) Full Knott-Zoeppritz equations are used to determine reflection coefficients.2) With facility objection function.3) The results in depth domain can be abtained.4) An individual wavelet is used for each angular offset.The good effects were achieved in teal seismic data.This is shown that the methods are feasible,reliable and practicablity.This methods not only reserves the relationship of AVO but also effectively advance the accuracy of reservori prediction and fluids identify.