岩性油气藏 ›› 2018, Vol. 30 ›› Issue (6): 7682.doi: 10.12108/yxyqc.20180609
邓浩阳1,2, 司马立强1,2, 吴玟3, 刘方霖4, 王馨5, 王超6, 杨国栋7
DENG Haoyang1,2, SIMA Liqiang1,2, WU Wen3, LIU Fanglin4, WANG Xin5, WANG Chao6, YANG Guodong7
摘要: 为厘清分形维数对储层物性特征的影响,并提高渗透率计算精度,通过对川西坳陷蓬莱镇组、沙溪庙组致密砂岩气藏12块岩心进行高压压汞实验;利用毛管束分形模型对进汞曲线进行分形处理,并结合物性资料,对分形维数与孔隙结构参数的关系进行研究;通过理论分析与多次试算,最终选取加权平均分形维数(Dave)、分界压力(pf)、中值半径(R50)等对渗透率进行多元非线性回归计算。结果显示:研究区储层可划分Ⅰ类、Ⅱ类、Ⅲ类、Ⅳ类共4种孔隙结构类型;大、小孔孔隙结构相对独立,分形维数与孔隙结构参数关系复杂;多元回归计算的渗透率与实测渗透率相关系数平方达0.9。多元非线性回归计算模型对于渗透率的计算具有更高的精度,为致密砂岩储层渗透率的计算提供了新思路。
中图分类号:
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