裂缝型储层预测的各向异性梯度反演方法研究

发布时间：2018-01-31 02:00

本文关键词： 裂缝各向异性梯度零约束反演最大似然解　出处：《石油物探》2017年06期 　论文类型：期刊论文

【摘要】：为了解决常规各向同性介质三参数反演方程难以满足各向异性介质四参数反演的问题,同时也为了解决难以获取测井各向异性信息的问题,建立了基于零约束的各向异性梯度四参数反演方程,提出了裂缝型储层预测的各向异性梯度反演反法。首先根据贝叶斯理论建立各向异性梯度四参数反演目标函数;然后将待反演参数零约束项加入到目标函数中,得到基于零约束的各向异性梯度四参数反演方程;求解该反演方程,得到各向异性梯度最大似然解,据此预测裂缝型储层。实际资料应用结果表明,该方法反演的各向异性梯度异常与钻井的裂缝发育区位置吻合,说明基于零约束的各向异性梯度四参数反演方法可以为裂缝型储层预测提供有效的技术支撑。
[Abstract]:In order to solve the problem that the three-parameter inversion equation of conventional isotropic medium is difficult to satisfy the four-parameter inversion of anisotropic medium, and to solve the problem that it is difficult to obtain well logging anisotropic information. The four-parameter inversion equation of anisotropic gradient based on zero constraint is established. An inverse inversion method for anisotropic gradient inversion of fractured reservoir is proposed. Firstly, the objective function of anisotropic gradient inversion is established according to Bayesian theory. Then the zero constraint term is added to the objective function to obtain the anisotropic gradient four parameter inversion equation based on zero constraint. By solving the inversion equation, the maximum likelihood solution of anisotropic gradient is obtained, according to which the fractured reservoir is predicted. The inversion of the anisotropic gradient anomaly coincides with the location of the fracture development area, which indicates that the four-parameter inversion method based on zero constraint anisotropic gradient can provide effective technical support for the prediction of fractured reservoirs.
【作者单位】：中海油研究总院;中国石油大学(华东)地球科学与技术学院;
【基金】：国家科技重大专项“亚太地区油气资源评价及未来战略发展方向”(2011ZX05028-006) 中海石油(中国)有限公司科技项目“巴新弧后前陆区复杂构造与油气成藏机制研究”(YXKY-2017-ZY-02)共同资助~~
【分类号】：P618.13
【正文快照】： 近垂直定向排列的裂缝型储层可以等效为HTI介质,具有横波分裂[1]和纵波方位各向异性特征[2-3]。但是横波勘探成本较大,因此业界更倾向于利用性价比较高的纵波方位地震数据预测裂缝型储层。纵波方位地震数据分为窄方位、宽方位和全方位3种,方位角越宽,应用效果越好。利用方位地

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