基于压汞资料的碳酸盐岩储层渗透率预测模型——以扎纳若尔油田KT-Ⅰ和KT-Ⅱ含油层系灰岩储层为例

发布时间：2018-05-15 09:51

本文选题：碳酸盐岩 + 压汞　；参考：《油气地质与采收率》2017年03期

【摘要】：以哈萨克斯坦扎纳若尔油田82块碳酸盐岩岩心的压汞及物性分析资料为基础,对比分析Swanson模型、Capillary-Parachor模型、Winland模型、Pittman模型、Nelson模型和δ函数模型预测碳酸盐岩储层渗透率的精度。结果表明,这6种渗透率预测模型对孔隙结构复杂的碳酸盐岩储层渗透率的预测精度均较差,但Swanson模型的预测精度优于其他5种模型。进一步分析Swanson模型预测碳酸盐岩储层渗透率的适用性,认为该模型不能反映储层微裂缝对渗透率的影响,也不能反映复杂的孔喉半径分布特征对渗透率的影响。对于孔喉半径分布呈多峰特征的碳酸盐岩岩心,孔喉的发育对储层的渗透率都有贡献,不存在优势孔喉区域,而Swanson模型将毛管压力曲线拐点处对应的孔喉半径作为岩心发育的优势孔喉半径,且忽略了孔喉半径分布呈双峰特征的岩心中发育的小孔喉对渗透率的影响,导致Swanson模型计算的渗透率误差较大。因此,以Swanson模型为基础,提出一种综合考虑孔隙度、歪度和分选系数等孔隙结构参数的改进渗透率预测模型,将该模型与Swanson模型进行对比,发现改进渗透率预测模型对孔隙结构复杂的碳酸盐岩储层渗透率的预测精度有明显提高。
[Abstract]:Based on the mercury injection and physical properties analysis data of carbonate core of block 82 in Zanaroer Oilfield, Kazakhstan, the accuracy of Swanson model, Capillary-Parachor model, Winland model, Pittman model, Nelson model and 未 function model for predicting carbonate reservoir permeability is compared and analyzed. The results show that the prediction accuracy of these six permeability prediction models for carbonate reservoirs with complex pore structure is poor, but the prediction accuracy of Swanson model is better than that of the other five models. The applicability of Swanson model in predicting the permeability of carbonate reservoir is further analyzed. It is concluded that the model can not reflect the influence of microfractures on permeability, nor the influence of complex pore throat radius distribution on permeability. For carbonate cores with multi-peak distribution of pore throat radius, the development of pore throat contributes to the permeability of reservoir, and there is no dominant pore throat area. In the Swanson model, the pore throat radius corresponding to the inflection point of the capillary pressure curve is taken as the dominant pore throat radius for core development, and the influence of the pore throat developed in the core with bimodal distribution on the permeability is ignored. The permeability error calculated by Swanson model is larger. Therefore, based on the Swanson model, an improved permeability prediction model is proposed, which considers the porosity, skew degree and sorting coefficient. The model is compared with the Swanson model. It is found that the accuracy of the improved permeability prediction model for carbonate reservoir with complex pore structure is obviously improved.
【作者单位】：长江大学地球物理与石油资源学院;长江大学油气资源与勘探技术教育部重点实验室;
【基金】：国家自然科学基金项目“致密气储层岩石导电机理研究及饱和度评价”(41404084) 湖北省自然科学基金项目“基于等效岩石单元模型的渗透率测井评价方法研究”(2013CFB396) 油气资源与勘探技术教育部重点实验室(长江大学)开放基金项目“基于成岩相相控的致密砂岩储层饱和度建模及测井评价”(K2016-09)
【分类号】：TE311

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