...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Petroleum Science & Engineering >Fractal characteristics of pore-throat structure and permeability estimation of tight sandstone reservoirs: A case study of Chang 7 of the Upper Triassic Yanchang Formation in Longdong area, Ordos Basin, China
【24h】

Fractal characteristics of pore-throat structure and permeability estimation of tight sandstone reservoirs: A case study of Chang 7 of the Upper Triassic Yanchang Formation in Longdong area, Ordos Basin, China

机译：砂岩储层孔隙结构的分形特征及渗透性估算 - 以中国鄂尔多斯盆地龙东地区延长三叠昌昌昌第7个案例研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Permeability estimation and quantitative evaluation of pore microstructure have always been hotspots and difficulties in tight sandstone reservoirs research. Taking the fractal dimension as the breakthrough, 10 core samples of Chang 7 section in the Upper Triassic Yanchang Formation were collected from different wells in Longdong area of Ordos Basin. The fractal dimension was calculated by mercury intrusion capillary pressure curve which can be obtained from high pressure mercury injection experiment, and samples were divided into four groups as group I, II, III and IV according to the value of fractal dimension estimated. The observation of casting thin sections and field emission scanning electron microscope show that group I mainly has dissolved-intergranular pores and original intergranular pores, group II is mainly dissolved-intergranular pores, group III mainly has dissolved-intragranular pores, and group IV is mainly micropores in clay matrix. Meanwhile, there is a highly correlation between the fractal dimension and the reservoir physical properties. With the fractal dimension of tight sandstone samples approaching 3, the compaction and cementation show a gradual increase, while the pore sorting, physical parameters and percolation capacity display a gradual decrease. Through multiple regression analysis, a set of empirical equations based on the fractal dimension and different pore throat radius were constructed, in which the equation based on maximum permeability contribution radius has the highest correlation. It shows that micropore (0.1-0.2 mu m) contributes most to permeability in tight sandstone reservoir. 10 blind samples were included in regression analysis to improve the prediction accuracy of the new model. A total of 28 samples, including 8 referenced data, were used to verify the predictive accuracy of the new model. The new empirical equation can predict the permeability of tight sandstone relatively accurate. Thus, the fractal dimension can effectively predict the permeability and evaluate the quality of tight sandstone reservoirs.
机译：孔隙微观结构的渗透率估算和定量评估始终是砂岩储层研究中的热点和困难。将分形尺寸作为突破，从鄂尔多斯盆地龙东地区的不同井收集了上三叠系延长地区的常三叠地区的10核样品。分形尺寸是通过汞的入侵毛细管压力曲线计算，该压力曲线可以从高压汞注射实验中获得，并且根据估计的分形尺寸的值，将样品分为四组作为I，II，III和IV。铸造薄截面和场发射扫描电子显微镜的观察表明，群体主要具有溶解晶状体和原始晶体孔，II组主要是溶解晶状体孔，III族主要溶解 - 腔内孔隙，而IV组主要是粘土基质的微孔。同时，分形维数和储层物理性质之间存在高度相关性。随着紧密砂岩样品的分形尺寸接近3，压实和胶形逐渐增加，而孔隙分类，物理参数和渗流能力显示逐渐减少。通过多元回归分析，构建了基于分形尺寸和不同孔喉桡骨的一组经验方程，其中基于最大渗透率贡献半径的等式具有最高的相关性。它表明微孔（0.1-0.2亩）在紧密砂岩储层中有更多的渗透性有助于渗透性。 10盲样品被列入回归分析中以提高新模型的预测精度。共使用28个样本，包括8个引用的数据，用于验证新模型的预测准确性。新的经验方程可以预测紧密砂岩的渗透性相对准确。因此，分形尺寸可以有效地预测渗透性并评估紧密砂岩储层的质量。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号