深部储层流体因子直接反演方法

发布时间：2018-01-15 14:07

本文关键词：深部储层流体因子直接反演方法　出处：《石油物探》2017年06期 　论文类型：期刊论文

【摘要】：深层油气藏勘探是目前油气勘探的热点之一,但是由于缺乏高质量的大角度地震道集数据,基于叠前地震反演的储层流体识别难以有效实施。为此,从Zoeppritz方程的近似方程出发,结合弹性参数间的岩石物理关系,推导了包含Gassmann流体项和剪切模量项的两项地震反射系数近似方程。利用模型试验证明了该方程的精度与三项方程相当,可以用于叠前地震反演。在贝叶斯反演理论框架下,基于该近似方程建立了不需要大角度地震数据的概率化叠前地震反演方法,用于直接反演Gassmann流体项,并进行储层流体识别。模型试算结果表明,该方法具有较高的准确度和稳定性;实际资料应用结果表明,该方法具有一定的实用性。
[Abstract]:Deep reservoir exploration is one of the hot spots in oil and gas exploration at present, but due to the lack of high quality large angle seismic trace data, reservoir fluid identification based on prestack seismic inversion is difficult to be effectively implemented. Based on the approximate equation of Zoeppritz equation, the rock physical relationship between elastic parameters is combined. Two approximate equations of seismic reflection coefficient including the term of Gassmann fluid and the term of shear modulus are derived, and the accuracy of the equation is proved to be equivalent to that of the three terms by model tests. In the framework of Bayesian inversion theory, a probabilistic prestack seismic inversion method without large angle seismic data is established based on the approximate equation. It is used to directly inverse the Gassmann fluid term and identify the reservoir fluid. The model test results show that the method has high accuracy and stability. The practical application results show that the method is practical.
【作者单位】：中海油研究总院;中国石油大学(北京);海洋石油勘探国家工程实验室;
【基金】：中国博士后科学基金(2016M601238) 国家科技重大专项课题(2016ZX05024001) 海洋石油勘探国家工程实验室自由探索课题联合资助~~
【分类号】：P618.13
【正文快照】： 100028)储层流体识别是油气勘探的关键环节,识别精度关系到油气藏开发的成败。地震数据中包含的诸多信息都被用于指示储层流体性质,弹性参数因其明确的物理意义和稳定的估计方法成为较常用的一类参数。地下岩石的速度、密度、阻抗等参数由于较容易获得,因而最早用于判别储层性

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