改进的模糊-灰色综合评判方法在储层定量评价中的应用——以苏里格气田苏X井区盒8下亚段低渗透气藏为例

doi:10.11743/ogg20170121

Abstract

Abstract:

For the lower section of 8th member of the Shihezi Formation (Middle Permain) in the Su X block of the Sulige gasfield,significant degree of uncertainty was involved in early-stage evaluation of low-permeability gas reservoir due to immature understanding and incomplete information,which causes difficulty to a fine reservoir description.It is vital for a better reservoir evaluation to fully account for uncertainty and effectively magnify the differences of different reservoirs in evaluation results.In this paper,based on the idea of multi-information superposition,the methods of fuzzy mathematical evaluation and grey correlation analysis are linked by membership degree and are integrated to establish a more effective fuzzy-grey comprehensive evaluation model,along with differentiated and improved internal algorithm.The application of the model to reservoir evaluation in this study suggests that this method enhances the differences and precision for the low-permeability reservoir classification and characterization,with consideration of the fuzzy and grey properties of reservoir.In this case study,four types of reservoir are classified and the type Ⅰ and Ⅱ are deemed to be the favorable targets.The different reservoir categories are better separated in plane view than before.The comparison of evaluation results with the real production data and geological principles of fluvial deposition also displays good coincidence.This method may be effective and efficient for guiding the exploration and development of the gas field,and provide a new thought for similar low-permeability reservoir evaluation as well.

Key words: quantitative evaluation, fuzzy mathematics, grey theory, reservoir description, Shihezi Formation, Sulige gasfield

CLC Number:

TE122.2

Zhu Zhaoqun, Lin Chengyan, Zhang Sujie, Ren Lihua, Zhao Jianxuan, Chen Shizhen, Jia Xiaopeng, Chen Li, Zhang Ji. Application of improved fuzzy-grey comprehensive evaluation method to quantitative reservoir evaluation: A case study of the low-permeability gas reservoirs of the lower part of 8th member of the Shihezi Formation in Su X block of Sulige Gasfield[J]. Oil & Gas Geology, 2017, 38(1): 197-208.

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Application of improved fuzzy-grey comprehensive evaluation method to quantitative reservoir evaluation: A case study of the low-permeability gas reservoirs of the lower part of 8th member of the Shihezi Formation in Su X block of Sulige Gasfield

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