碳酸盐岩储层核磁共振分析方法的实验及应用——以塔河油田为例

doi:10.11743/ogg20090317

摘要/Abstract

摘要：

针对塔河油田裂缝性和孔洞型岩心,给出利用核磁共振技术进行碳酸盐岩储层分析的新方法,阐述了核磁共振成像和T₂谱测试岩心油层物性参数的原理。通过岩心测试分析,建立了利用核磁共振成像和T₂谱分析岩心空间结构和划分碳酸盐岩储集空间类型,并进行油水识别、研究岩心流体动用条件及评价储层开发效果的方法。结果表明,核磁共振技术可直接探测岩心中的流体及其分布,测量结果与样品形状及大小无关。塔河油田碳酸盐岩储层可以分为四大类,即孔隙类(基质)、溶孔类、裂缝类和孔洞缝类,它们的核磁共振图像和T₂谱各有其特点。通过测试可快速划分岩心储集空间类型及其特征。塔河油田碳酸盐岩可动流体饱和度计算的基础数据T₂平均截止值为86.25ms,它是评价碳酸盐储层开发潜力的一个重要物性参数。对塔河油田不同开发区块进行核磁共振评价碳酸盐岩储层开发效果的应用研究表明,评价预测储层开发效果与油田实际开发效果一致,从而验证了核磁共振技术评价碳酸盐岩储层开发效果的可行性。

关键词: 核磁共振成像, 核磁共振T₂谱, 碳酸盐岩储层, 塔河油田

Abstract:

Carbonate reservoirs in the Tahe oilfield feature in fractures and vuggies.Nuclear magnetic resonance(NMR) was therefore employed to analyze these formations.The paper expounds on the working principles of NMR imaging as well as T₂ spectrum in rock property testing.By using these technologies,the authors established the spatial structures for cores and classified the carbonate reservoir space types.They also carried out oil and water detection,and studied conditions for fluid moving inside the cores and methods for appraisal of reservoir development effect.The results show that NMR can directly detect fluid and its distribution inside the cores,and that no connection exists between testing results and the shape and size of the samples.The carbonate reservoirs in the Tahe oilfield can be classified into four main types:pore(matrix),dissolution pore,fracture,and pore-vug-fracture,each has unique NMR imaging and T₂ spectrum characteristics and therefore can be easily recognized.The T₂ cutoff value(an important physical parameter for evaluating the development potential of carbonate reservoirs) of the carbonate reservoirs in the Tahe oilfield is 86.25 ms.Application of the methods in different blocks with carbonate reservoirs in the Tahe oilfield indicates that the prediction of reservoir development accord with the actual results,thus verifies the feasibility of the method in the evaluation of carbonate reservoir development.

Key words: magnetic resonance imaging, T₂ spectroscopy of magnetic resonance, carbonate reservoir, Tahe oilfield

中图分类号:

TE135

郎东江, 尚根华, 吕成远, 丁绍卿, 孙爱军, 尚绪岚. 碳酸盐岩储层核磁共振分析方法的实验及应用——以塔河油田为例[J]. 石油与天然气地质, 2009, 30(3): 363-369,362.

Lang Dongjiang, Shang Genhua, LüChengyuan, Ding Shaoqing, Sun Aijun, Shang Xulan. Experiment and application of NMR in carbonate reservoir analysis:an example from Tahe oilfield[J]. Oil & Gas Geology, 2009, 30(3): 363-369,362.

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