| Citation: | YANG Yimeng，XU Shouyu，CHEN Maiyu，et al. Quantitative characterization of reservoir heterogeneity using AHP-CRITIC method: A case study of 24 layers of the Upper Es4 Member in Block Fan 151[J]. Bulletin of Geological Science and Technology，2025，${article_volume}（0）：1-11 doi: 10.19509/j.cnki.dzkq.tb20240394
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Block Fan 151 is a low-permeability beach-bar sandstone reservoir with poor overall physical properties and high heterogeneity, resulting in low oil recovery and significant amounts of residual oil during development. It is essential to analyze the influence of reservoir heterogeneity on the distribution of residual oil and identify enrichment areas. Furthermore, calculating the reservoir heterogeneity comprehensive index plays a crucial role in quantitatively characterizing heterogeneity. Therefore, improving the accuracy of calculating the comprehensive index can provide a basis for predicting favorable areas for oilfield development and finding residual oil.
To improve the accuracy of the comprehensive reservoir heterogeneity index calculation, this study proposes the AHP-CRITIC combined weighting method. This method determines the composite weight of evaluation indicators using both subjective and objective data, overcoming the limitations of a single weighting approach.
Quantitative analysis of the heterogeneity of the 24 layers in the Upper Es4 Member of Block Fan 151 shows that the heterogeneous comprehensive index I ranges from 0.27 to 0.73, with about 63% of the values falling between 0.4 and 0.65.
The target formation in the study area exhibits moderate to strong heterogeneity, and the distribution of high values of the comprehensive heterogeneity index I aligns closely with the high-value areas on the residual oil saturation contour map. This indicates that the AHP-CRITIC combined weighting method effectively assigns weights to the evaluation parameters and establishes a quantitative evaluation criterion for the heterogeneity of this reservoir. This approach offers a new method for the quantitative characterization of reservoir heterogeneity.
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