...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Oceanographic Literature Review >Well technology
【24h】

Well technology

机译：井技术

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

Currently, global shale gas exploration and exploitation are focused on marine shale. Recently, major shale gas-oil breakthroughs have been made within continental and marine-continental transitional shale in China. This study will show how transitional shale is of great importance. Based on geological field surveys, core observations, thin section analysis, organic geochemistry and X-ray diffraction, we systematically studied the basic geological characteristics (including lithology, mineral composition, and organic geochemistry) of this transitional shale. By comparative analysis of well logging data from 260 wells in the Taiyuan-Shanxi shale, we will show that these methods are effective for identifying organic-rich shale from conventional well logs and determining its thickness distribution in the Carboniferous-Permian strata of the Taiyuan-Shanxi transitional coal-bearing formation.The results indicate that the Taiyuan-Shanxi shale has a high TOC (most 2%-4%) and that the lithology is primarily carbonaceous shale with type Ⅱ_2-Ⅲ kerogens. The high thermal maturation (Ro ≥ 1.1%) favors the generation of gas. The mineral components primarily include clay minerals, quartz, and plagioclase with a moderate brittle mineral content (47 wt.%) and high clay mineral content (51 wt.%) dominated by kaolinite (43%) and mixed-layer illite-smectite (31%). The transitional organic-rich shale on conventional log curves is generally characterized by higher gamma ray (GR), neutron porosity (CNL), acoustic travel time (AC), resistivity (R_t), potassium (K), and uranium (U) readings and a lower density (DEN), photoelectric absorption index (PE) and thorium-uranium ratio (TH/U). After analyzing the log response characteristics of the organic-rich shale, the most sensitive logging curves (such as CNL, AC, DEN, PE and U) were optimized to conduct logging overlays and to construct cross-plots to qualitatively identify organic-rich shale. The identified organic-rich shale amalgamates in the middle-upper member of the Taiyuan Formation and the lower member of the Shanxi Formation consistent with the results of the TOC analysis and practical gas logging. Based on the qualitative evaluation methods of the modified LogR and a multivariate linear regression model, we calculated the TOC of shale wells in the Taiyuan-Shanxi formation. From this we calculated the characteristic values of organic-rich shale thickness. The results indicate that organic-rich shale in the Taiyuan formation is thicker than that in the Shanxi formation. Additionally, the thickness of organic-rich shale within lagoons and deep reed swamp facies are much thicker (25-35 m and 40-80 m) than other structural profile types, whereas their lateral distribution is less than that of marine shale. The relatively small continuous thickness of the single shale layer and high clay content may have negative effects for developing the shale gas potential.
机译：当前，全球页岩气的勘探和开发集中在海洋页岩上。最近，中国大陆和海陆过渡页岩已经取得了页岩气的重大突破。这项研究将显示过渡页岩是多么重要。基于地质现场调查，岩心观察，薄层分析，有机地球化学和X射线衍射，我们系统地研究了该过渡页岩的基本地质特征（包括岩性，矿物组成和有机地球化学）。通过对太原-山西页岩的260口井的测井数据进行对比分析，我们将证明这些方法对于从常规测井中识别富含有机质的页岩并确定太原-石炭-二叠系地层的厚度分布是有效的。结果表明，太原-山西页岩的总有机碳含量较高（最高为2％-4％），岩性主要为含Ⅱ_2-Ⅲ型干酪根的碳质页岩。高的热成熟度（Ro≥1.1％）有利于气体的产生。矿物成分主要包括粘土矿物，石英和斜长石，矿物含量适中（47 wt。％），粘土矿物含量高（51 wt。％），高岭石（43％）和伊利石-蒙脱石混合层（ 31％）。常规测井曲线上富含过渡有机物的页岩通常具有较高的伽马射线（GR），中子孔隙率（CNL），声波传播时间（AC），电阻率（R_t），钾（K）和铀（U）读数的特征较低的密度（DEN），光电吸收指数（PE）和th铀比率（TH / U）。在分析了富含有机物的页岩的测井响应特征后，最敏感的测井曲线（例如CNL，AC，DEN，PE和U）被优化以进行测井叠加并构建交叉图以定性地识别富含有机物的页岩。在太原组中上段和山西组下段中发现的富含有机质的页岩合并物与TOC分析和实际天然气测井的结果一致。基于改进的LogR的定性评价方法和多元线性回归模型，我们计算了太原-山西组页岩井的TOC。由此我们计算出富含有机物的页岩厚度的特征值。结果表明，太原组富含有机质的页岩比山西组浓。此外，泻湖和深芦苇沼泽相内富含有机质的页岩的厚度比其他构造剖面类型要厚得多（25-35 m和40-80 m），而其侧向分布小于海相页岩。单页岩层的相对较小的连续厚度和高粘土含量可能会对页岩气潜力产生负面影响。

著录项

  • 来源
    《Oceanographic Literature Review》 |2016年第2期|441-441|共1页
  • 作者

  • 作者单位
  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
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