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首页> 外文期刊>Arabian Journal for Science and Engineering >Predicting the Porosity of Natural Fractures in Tight Reservoirs
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Predicting the Porosity of Natural Fractures in Tight Reservoirs

机译：预测致密油藏天然裂缝的孔隙度

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摘要

Predicting the fracture porosity of tight fracture reservoirs represents a difficult problem for log interpretation, although studying conventional log responses of tight fracture reservoirs provides helpful insights. Comparisons and analyses of the log response characteristics of the natural fracture zone of a tight reservoir are performed, and the results indicate that the acoustic (AC) and density (DEN) data are highly sensitive to fractures. First, the log response of the AC and DEN data are sensitive to tight fracture reservoirs, and differences in the AC and DEN log responses are obvious. Second, based on these differences, a model for calculating the fracture porosity is constructed, and an improved Willie difference method for the AC and DEN responses is proposed to calculate the fracture porosity. Finally, we apply the methodology to a case study of a tight reservoir in the Sichuan Basin, China, and then calculate the AC-DEN correlation coefficient and fracture porosity. The calculated fracture porosity is consistent with the fracture porosity from the full borehole micro-resistivity imaging results and core porosity. The results indicate that the method is applicable for predicting the porosity of fractures.
机译：尽管研究致密裂缝储层的常规测井响应提供了有益的见识，但预测致密裂缝储层的裂缝孔隙度是测井解释的一个难题。对致密储层天然裂缝带的测井响应特征进行了比较和分析，结果表明声（AC）和密度（DEN）数据对裂缝高度敏感。首先，AC和DEN数据的测井响应对致密裂缝储层敏感，AC和DEN测井响应的差异很明显。其次，基于这些差异，建立了计算裂缝孔隙度的模型，并提出了一种针对AC和DEN响应的改进的Willie差分方法来计算裂缝孔隙度。最后，我们将该方法应用于中国四川盆地致密油藏的案例研究中，然后计算AC-DEN相关系数和裂缝孔隙度。计算得到的裂缝孔隙度与全井眼微电阻率成像结果和岩心孔隙度的裂缝孔隙度一致。结果表明该方法可用于预测裂缝的孔隙度。

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