岩性油气藏 ›› 2015, Vol. 27 ›› Issue (5): 104–107.doi: 10.3969/j.issn.1673-8926.2015.05.017

• 油气地质 • 上一篇    下一篇

一种基于岩石薄片图像的粒度分析新方法

袁 瑞12,朱 锐1,瞿建华3,孙玉秋2,唐 勇3,潘 进1   

  1.  1. 长江大学 地球科学学院,武汉 430100 ; 2. 长江大学 信息与数学学院,湖北 荆州 434023 ;3. 中国石油新疆油田分公司 勘探开发研究院,新疆 克拉玛依 834000
  • 出版日期:2015-09-26 发布日期:2015-09-26
  • 第一作者:袁瑞( 1987- ),男,长江大学在读博士研究生,研究方向为石油测井与地质。 地址:( 430100 )湖北省武汉市蔡甸区大学路 111 号长江大学地球科学学院。 E-mail : yuanrui87@163.com 。
  • 基金资助:

    国家自然科学基金“珠江口盆地渐新世—中新世潮汐沉积与潮汐周期研究”(编号: 41302096 )和湖北省自然科学基金“随钻跟踪海
    量数据处理与成图关键技术研究”(编号: 2013CFA053 )联合资助

A new method of determining grain size based on rock section image

Yuan Rui12, Zhu Rui1, Qu Jianhua3, Sun Yuqiu2, Tang Yong3, Pan Jin1   

  1.  1. School of Geosciences , Yangtze University , Wuhan 430100 , China ; 2. School of Information and Mathematics ,Yangtze University , Jingzhou 434023 , Hubei , China ; 3. Research Institute of Exploration and Development ,PetroChina Xinjiang Oilfield Company , Karamay 834000 , Xinjiang , China
  • Online:2015-09-26 Published:2015-09-26
  • Supported by:

    spatial autocorrelation coefficient|grain size analysis|least squares method|simulated rock section

摘要:

鉴于岩石薄片粒度分析的实验室技术具有较大的局限性,且速度缓慢,提出了一种基于岩石薄片图像空间自相关系数的粒度分析新方法。该方法通过计算已知颗粒大小的岩石薄片的空间自相关系数,并利用带约束条件的最小二乘法求解对应的空间自相关系数方程组,从而得到颗粒大小未知的岩石薄片的粒度分布。 采用椭圆随机生成的方法制作了颗粒大小不同的理论模拟岩石薄片,并分析了其空间自相关系数与粒度的关系,得出空间自相关系数随着偏移距离的增大而减小;当偏移距离一定时,空间自相关系数随着粒度的增大而增大。采用该方法对粗砂岩中粒径分别为 0.5~1.0 mm,1.0~1.5 mm 和 1.5~ 2.0 mm 的颗粒进行了粒度分布的定量计算,得出这 3 种粒径颗粒所占的百分比分别为 55.8%,24.6%和20.2%,该结果与实际值较接近,变化趋势与实际一致。

关键词: 大面积砂体, 形成机理, 盒 8 段, 鄂尔多斯盆地

Abstract:

Despite technological advances in lab instruments, grain-size analysis has many limitations, such as low speed. A theoretical method of determining grain size based on spatial autocorrelation coefficient of simulated rock section was proposed. Firstly, spatial autocorrelation coefficient was obtained from a group of known distribution grain size of rock section. Secondly, an unknown distribution grain size of rock section was used to calculate spatial autocorrelation coefficient. Finally, linear least squares method about spatial autocorrelation coefficient was solved with constrains. In order to show the feasibility and availability of this method, a serial theoretical rock sections were simulated by random ellipse process. Relationship between spatial autocorrelation coefficient and grain size of simulated rock section was analyzed. With the decrease of offset or increase of grain size of rock section, spatial autocorrelation coefficient is increasing. Grain size distribution of simulated rock section was determined accurately. For example, gritstone was separated into 0.5~1.0 mm, 1.0~1.5 mm and 1.5~2.0 mm, whose computed percentages are respectively 55.8%, 24.6% and 20.2% by the proposed method, closing to the actual values, and the variation trend is same as the actual.

Key words: large-area sand bodies, formation mechanism, the eighth member of Shihezi Formation, Ordos Basin

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