岩性油气藏 ›› 2018, Vol. 30 ›› Issue (6): 76–82.doi: 10.12108/yxyqc.20180609

• 油气地质 • 上一篇    下一篇

致密砂岩储层孔隙结构分形研究与渗透率计算——以川西坳陷蓬莱镇组、沙溪庙组储层为例

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   

  1. 1. 油气藏地质及开发工程国家重点实验室·西南石油大学, 成都 610500;
    2. 西南石油大学 地球科学与技术学院, 成都 610500;
    3. 中国石油西南油气田分公司 蜀南气矿, 四川 泸州 646000;
    4. 中国石油塔里木油田分公司 开发事业部, 新疆 库尔勒 841000;
    5. 中国石油西南油气田分公司 重庆气矿, 重庆 忠县 404300;
    6. 陕西延长石油(集团)有限责任公司 研究院, 西安 710000;
    7. 西安理工大学 高科学院, 西安 710109
  • 收稿日期:2018-05-07 修回日期:2018-07-18 出版日期:2018-11-16 发布日期:2018-11-16
  • 第一作者:邓浩阳(1989-),男,西南石油大学在读博士研究生,研究方向为岩石物理实验与地球物理测井解释。地址:(610500)四川省成都市新都区新都大道8号。Email:dhy_swpu@163.com
  • 通信作者: 司马立强(1961-),男,博士,教授,主要从事地球物理测井解释方面的研究工作。Email:smlq2000@126.com。
  • 基金资助:
    大型油气田及煤层气开发国家重大科技专项“四川盆地大型碳酸盐岩气田开发示范工程”（编号：2016ZX05052）资助

Fractal characteristics of pore structure and permeability calculation for tight sandstone reservoirs: a case of Penglaizhen Formation and Shaximiao Formation in Western Sichuan Depression

DENG Haoyang1,2, SIMA Liqiang1,2, WU Wen3, LIU Fanglin4, WANG Xin5, WANG Chao6, YANG Guodong7   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    3. Shunan Gas Mine, PetroChina Southwest Oil and Gas Field Company, Luzhou 646000, Sichuan, China;
    4. PetroChina Tarim Oilfield Company, Korla 841000, Xinjiang, China;
    5. Chongqing Gas Mine, PetroChina Southwest Oil and Gas Field Company, Zhongxian 404300, Chongqing, China;
    6. Research Institute, Shaanxi Yanchang Petroleum(Group) Limited Liability Company, Xi'an 710000, China;
    7. School of High Technology, Xi'an University of Technology, Xi'an 710109, China
  • Received:2018-05-07 Revised:2018-07-18 Online:2018-11-16 Published:2018-11-16

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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。

关键词: 孔隙结构, 分形理论, 致密砂岩, 川西地区

Abstract: In order to clarify the influence of fractal dimension on macroscopic reservoir physical properties and improve permeability calculation accuracy, high pressure mercury injection experiments were carried out on 12 cores of tight sandstone gas reservoirs in Penglaizhen and Shaximiao Formation in Western Sichuan Depression. All the curves of mercury intrusion were processed by fractal model based on capillary tubes. Combined with poro-sity and permeability, the correlation between fractal dimension and pore structure parameters was analyzed. Through theoretical analysis and many times of trial, Dave, Pf and R50 were finally selected to calculate permeabi-lity by multiple nonlinear regression. The results show that the pore structure in tight sandstone could be divided into four types. The pore structures of big and small pores are relatively independent, and the relationships between fractal dimensions and pore structure parameters are complex. The calculated permeability by multiple nonlinear regression shows strong correlation with measured permeability, whose correlation coefficient squared is more than 0.9. The established model by multiple nonlinear regression shows more accurate in permeability calculation and it provides another thought for permeability calculation.

Key words: pore structure, fractal theory, tight sandstone, Western Sichuan Basin

中图分类号: 

  • TE122
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