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首页> 外文期刊>The Leading Edge >Modeling dynamic elastic properties of compacting chalk reservoirs using an integrated rock-physics workflow: A case study in the Ekofisk Field, Norway
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Modeling dynamic elastic properties of compacting chalk reservoirs using an integrated rock-physics workflow: A case study in the Ekofisk Field, Norway

机译：使用集成的岩石物理工作流程对粉密粉笔储层的动态弹性特性进行建模：以挪威Ekofisk油田为例

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摘要

An integrated rock-physics modeling workflow is discussed that aims at predicting the effective elastic moduli and density of a producing reservoir in response to pressure, porosity, and fluid-saturation changes, and that is suitable for application to compacting chalk reservoirs. A simple extended form of Nur's modified Voigt model is used to build the dry-rock elastic modulus and porosity relationship. Granular medium contact theory is used to model pressure change, and Gassmann's equation is used to model the fluid effect. A dynamic-compaction model from reservoir simulation is used to model porosity change due to compaction. The rock-physics model is calibrated at well locations from the Ekofisk Field in the North Sea; however, the absence of time-lapse logging makes the 4D calibration challenging. Effective fluid properties are calculated dynamically with the Fluid Acoustics for Geophysics (FLAG) software program, using inputs from the reservoir simulator and PVT measurements. For low water saturation (＜ 20%) and high-porosity (＞ 30%) rocks, the model predictions show very good correlation with measured data. The model underpredicts the sonic velocities for rocks with low porosity and high water saturation.
机译：讨论了一个集成的岩石物理建模工作流程，该工作流程旨在响应压力，孔隙率和流体饱和度变化来预测生产油藏的有效弹性模量和密度，适用于压实白垩油藏。 Nur修改后的Voigt模型的简单扩展形式用于建立干岩的弹性模量和孔隙率关系。颗粒介质接触理论用于建模压力变化，而Gassmann方程用于建模流体效应。来自储层模拟的动态压实模型用于模拟由于压实引起的孔隙度变化。岩石物理模型是在北海Ekofisk油田的井场进行校准的；但是，由于缺少延时记录，因此4D校准具有挑战性。有效的流体属性是通过地球物理流体声学（FLAG）软件程序，使用来自储层模拟器和PVT测量的输入动态计算的。对于低水饱和度（＜20％）和高孔隙度（＞ 30％）的岩石，模型预测与实测数据具有很好的相关性。该模型对低孔隙度和高含水饱和度的岩石的声速预测不足。

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