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Fracture prediction approach for oil-bearing reservoirs based on AVAZ attributes in an orthorhombic medium

机译：斜方介质中基于AVAZ属性的含油储层裂缝预测方法

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Fracture systems in nature are complicated. Normally vertical fractures develop in an isotropic background. However, the presence of horizontal fine layering or horizontal fractures in reservoirs makes the vertical fractures develop in a VTI (a transversely isotropic media with a vertical symmetry axis) background. In this case, reservoirs can be described better by using an orthorhombic medium instead of a traditional HTI (a transversely isotropic media with a horizontal symmetry axis) medium. In this paper, we focus on the fracture prediction study within an orthorhombic medium for oil-bearing reservoirs. Firstly, we simplify the reflection coefficient approximation in an orthorhombic medium. Secondly, the impact of horizontal fracturing on the reflection coefficient approximation is analyzed theoretically. Then based on that approximation, we compare and analyze the relative impact of vertical fracturing, horizontal fracturing and fluid indicative factor on traditional ellipse fitting results and the scaled B attributes. We find that scaled B attributes are more sensitive to vertical fractures, so scaled B attributes are proposed to predict vertical fractures. Finally, a test is developed to predict the fracture development intensity of an oil-bearing reservoir. The fracture development observed in cores is used to validate the study method. The findings of both theoretical analyses and practical application reveal that compared with traditional methods, this new approach has improved the prediction of fracture development intensity in oil-bearing reservoirs.
机译：自然界中的断裂系统很复杂。通常垂直裂缝在各向同性背景下发展。然而，储层中水平细分层或水平裂缝的存在使得垂直裂缝在VTI（具有垂直对称轴的横向各向同性介质）背景下发育。在这种情况下，通过使用斜方型介质代替传统的HTI（具有水平对称轴的横向各向同性介质）介质，可以更好地描述储层。在本文中，我们将重点放在含斜油层的斜方介质中的裂缝预测研究中。首先，我们简化了正交介质中的反射系数近似。其次，从理论上分析了水平压裂对反射系数逼近的影响。然后，基于该近似值，我们比较并分析了垂直压裂，水平压裂和流体指示因子对传统椭圆拟合结果和可缩放的B属性的相对影响。我们发现缩放的B属性对垂直裂缝更敏感，因此提出了缩放的B属性来预测垂直裂缝。最后，开发了一个测试来预测含油储层的裂缝发育强度。在岩心中观察到的裂缝发展被用来验证研究方法。理论分析和实际应用的结果表明，与传统方法相比，该新方法改善了含油储层裂缝发育强度的预测。

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