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

Abstract

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

CLC Number:

TE135

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.

References

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Experiment and application of NMR in carbonate reservoir analysis:an example from Tahe oilfield

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