阵列侧向测井响应模拟及泥浆侵入校正研究

Advances in Geo-Energy Research, 2019, 3(2): 175-186

原文网址: https://www.yandy-ager.com/index.php/ager/article/view/123

        泥滤液侵入对储层的影响评价是一项复杂的工作。本文给出了阵列侧向测井响应的数值模拟结果和泥浆侵入校正的方法。

       近日，中国地质大学（武汉）赵培强副教授基于岩石稳流场的微分方程及边界条件，利用有限元方法求解拉普拉斯方程。计算每个节点的电位值以及阵列侧向的六种测量模式的视电阻率。基于数值结果，阵列侧向响应受到影响参数，包括井眼半径，泥浆滤液电阻率，泥浆滤液入侵半径和侵入区电阻率。为了准确地获得泥浆滤液侵入深度和未侵入地层的真实电阻率，分别制作了井眼和泥浆滤液侵入的校正图版。将校正图版应用于砂岩储层的实际阵列侧向数据，校正的电阻率更接近真实地层电阻率值。

Study on array laterolog response simulation and mud-filtrate invasion correction

Peiqiang Zhao, Ruidong Qin, Heping Pan, Mehdi Ostadhassan, Yuqi Wu

(Published: 2019-03-10)

CorrespondingAuthor and Email:

Heping Pan, panpinge@163.com;

ORCID: https://orcid.org/0000-0003-3351-3534 (Peiqiang Zhao)

Citation: Zhao, P., Qin, R., Pan, H., Ostadhassan, M., Wu, Y. Study on array laterolog response simulation and mud-filtrate invasion correction. Advances in Geo-Energy Research, 2019, 3(2): 175-186, doi: 10.26804/ager.2019.02.07.

ArticleType: Original article

Abstract：

      It is a complicated task to evaluate the reservoirs influenced by mud-filtrate invasion. This study presents numerical simulation results of array laterolog response and the approach for mud-filtrate invasion correction. Considering differential equations and boundary conditions of the steady current field in the rock medium, finite element method (FEM) is utilized to solve the Laplace equation. Then the potential value at each node is calculated along with the apparent resistivity of six measuring modes of array laterolog. Based on the numerical results, the array laterolog response is affected by various parameters including borehole radius, mud-filtrate resistivity, mud-filtrate invasion radius and invaded zone resistivity. Correction charts for borehole and mud-filtrate invasion are developed to accurately obtain the mud-filtrate invasion depth and the true resistivity of the uninvaded formation. The correction chart has been applied to the real array laterolog data of a sandstone reservoir, which the corrected resistivity is closer to the true formation resistivity.

Keywords: Array laterolog, numerical simulation, finite element method, mud-filtrate invasion.

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