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首页> 外文期刊>Journal of Petroleum Exploration and Production Technology >Saturation modeling in a carbonate reservoir using capillary pressure based saturation height function: a case study of the Svk reservoir in the Y Field
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Saturation modeling in a carbonate reservoir using capillary pressure based saturation height function: a case study of the Svk reservoir in the Y Field

机译：使用基于毛细管压力的饱和高度函数对碳酸盐岩储层进行饱和度模拟：以Y田Svk储层为例

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Because of the complex pore structure and the strong heterogeneity of the Svk carbonate reservoir in the Y Field, water saturation distribution and petrophysical properties, such as porosity, permeability and capillary pressure are difficult to be characterized. To solve this problem, a new method to interpret water saturation was presented. By this method, the relationships among porosity, permeability and different pore throat radii are fitted and a typical radius R30 (the pore aperture radius corresponding to 30?% of mercury saturation in a mercury penetration test) selected. By fitting the capillary pressure curves with Corey–Brooks function, the threshold pressure, the irreducible water saturation and the Corey exponent “n” of each capillary pressure curve can be determined, and the relationship between R30 and the threshold pressure, R30 and the irreducible water saturation, and R30 and the Corey exponent can all be fitted. If the R30 value is known, the threshold pressure, irreducible water saturation and Corey exponent can be calculated by the fitting equations; hence, the water saturation at a given height from FWL can be calculated by the Corey–Brooks function. The water saturation calculated by saturation height function is consistent with that of the well log interpretation and the error is less than by other methods. During the process of three-dimensional saturation modeling, an R30 criterion is presented to define rock types, six petrophysical rock types with different reservoir properties are distinguished and a link is set up between rock types and log responses by the KNN method. Logs are utilized to predict rock types of non-cored wells according to this link, and a three-dimensional rock-type model is established by the Petrel software. R30 value of each grid can be calculated by R30 formula when three-dimensional porosity and permeability models are built with the restraint of rock-type model. Then, on the basis of the saturation height function, a three-dimensional water saturation model can be obtained.
机译：由于Y场中Svk碳酸盐岩储层的孔隙结构复杂且非均质性强，因此难以表征含水饱和度分布和岩石物理性质，例如孔隙度，渗透率和毛细管压力。为了解决这个问题，提出了一种解释水饱和度的新方法。通过这种方法，拟合了孔隙度，渗透率和不同的孔喉半径之间的关系，并选择了典型半径R30（孔洞半径对应于汞渗透测试中汞饱和度的30％）。通过用Corey-Brooks函数拟合毛细管压力曲线，可以确定每个毛细管压力曲线的阈值压力，不可还原水饱和度和Corey指数“ n”，以及R30与阈值压力之间的关系，R30和不可还原水饱和，并且R30和Corey指数都可以安装。如果R30值已知，则可以通过拟合方程计算阈值压力，不可还原的水饱和度和Corey指数;因此，可以通过Corey-Brooks函数计算从FWL到给定高度的水饱和度。用饱和高度函数计算出的水饱和度与测井解释的水饱和度一致，误差小于其他方法。在三维饱和度建模过程中，提出了一种R30准则来定义岩石类型，区分了具有不同储层性质的六种岩石物理类型，并通过KNN方法建立了岩石类型与测井响应之间的联系。根据该链接，利用测井来预测无芯井的岩石类型，并通过Petrel软件建立三维岩石类型模型。当在岩石型约束下建立三维孔隙度和渗透率模型时，可以通过R30公式计算出每个网格的R30值。然后，基于饱和度高度函数，可以获得三维水饱和度模型。

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