基于波形聚类的人工智能流单元划分方法——以哈萨克斯坦南mangyshak盆地Zhetybay油田为例

Li-bing Fu, Jun Ni, Yuming Liu, Xuanran Li, Anzhu Xu
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引用次数: 1

摘要

Zhetybay油田位于南Mangyshlak次盆地,这是哈萨克斯坦西部的一个三角洲前缘沉积储层。它于1961年被发现,并于1967年首次通过水驱开采。经过50多年的水驱开发,油藏普遍处于中高水驱阶段,油水分布变得复杂、混乱。由于该油田具有高密度井网的特点,且拥有2000多口井,测井信息丰富,因此手工处理和识别如此多的测井资料非常困难。采用波浪聚类方法对测井曲线的沉积韵律进行划分。沉积微相表现为回归序列,形成复合河口坝与分流河道组合、连接坝边的河口坝与分布河道组合、孤立河口坝与分布河道组合、孤立滩砂等4种复合砂体。为了区分流动单元,在开发流动指数和储层质量因子的基础上,通过学习流动单元类别与参数之间的非线性关系,总结沉积相的渗透率对数和孔隙度参数,分析生产动态,建立了人工智能算法-支持向量机(SVM)方法。将浙东湾油田的流动单元划分为A、B1、B2、B3 4种类型,后3种类型为主要流动单元。A型分布在河道中,B1型分布在坝体中,B2型主要分布在坝体中,B2型部分分布在坝边,B3型分布在坝边、片砂和滩砂中。结果表明,支持向量机对流动单元划分的准确率达到91.1%,明确了油田开发流动单元的分布规律。该研究是新井定位和优化修井以提高可采储量的重要关键之一。为该油田高效注水开发提供了有效指导。
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Artificial Intelligence Method of Flow Unit Division Based on Waveform Clustering: A Case Study on Zhetybay Oil Field, South Mangyshalk Basin, Kazakhstan
The Zhetybay Field is located in the South Mangyshlak Sub-basin, a delta front sedimentary reservoir onshore western Kazakhstan. It was discovered in 1961 and first produced by waterflooding in 1967. After more than 50 years of waterflooding development, the reservoirs are generally in the mid-to-high waterflooded stage and oil-water distribution becomes complicated and chaotic. It is very difficult to handle and identify so much logging data by hand since the oilfield has the characteristics of high-density well pattern and contains rich logging information with more than 2000 wells. The wave clustering method is used to divide the sedimentary rhythm of the logging curve. Sedimentary microfacies manifested as a regression sequence, with four types of composite sand bodies including the composite estuary bar and distributary channel combination, the estuary bar connected to the dam edge and the distributing channel combination, the isolated estuary bar and distributing channel combination, and the isolated beach sand. In order to distinguish the flow units, the artificial intelligence algorithm-support vector machine (SVM) method is established by learning the non-linear relationship between flow unit categories and parameters based on developing flow index and reservoir quality factor, summarizing permeability logarithm and porosity degree parameters in the sedimentary facies, and analyzing the production dynamic. The flow units in Zhetybay oilfield were classified into 4 types: A, B1, B2 and B3, and the latter three are the main types. Type A is distributed in the river, type B1 is distributed in the main body of the dam, type B2 is mainly distributed in the main body of the dam, and some of B2 is distributed in the dam edge, and B3 is located in the dam edge, sheet sand and beach sand. The results show that the accuracy of flow unit division by support vector machines reaches 91.1%, which clarifies the distribution law of flow units for oilfield development. This study is one of the significant keys for locating new wells and optimizing the workovers to increase recoverable reserves. It provides an effective guidance for efficient waterflooding in this oilfield.
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