Scholarlink

<p>Carbonates, the main components of oil shale that influence oil and gas accumulation, are becoming increasingly significant in oil shale studies. This paper aims to examine the formation mechanisms of various carbonate minerals in shale and their impact on oil enrichment. In the Dongying Depression, two predominant types of carbonate minerals have been identified: micritic carbonate and grain carbonate. Micritic carbonate primarily forms through biogenic processes, where alternating carbonate and clay mineral laminae result from the periodic stratification of lacustrine water bodies. These layers are relatively thin. Micritic carbonate rocks contain low organic matter and predominantly feature narrow slit-like pores, leading to a tight pore structure that hinders oil shale accumulation. In contrast, grain carbonate formation is governed by diagenetic processes. Influenced by deep fluids, these carbonate laminae are mainly composed of lens-shaped, coarsely crystalline calcite and exhibit significant thickness. Grain carbonate rocks have a relatively high organic matter content, with pore spaces primarily consisting of bottleneck- and slit-shaped throats. This configuration enhances reservoir capacity and creates favorable conditions for oil shale accumulation.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Formation of carbonate laminae in shale and their impact on organic matter in Dongying depression

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月1日

查看全文
  • Chuanming Li,
  • Yong Wu,
  • Xuefeng Ding,
  • Xiankui Xie,
  • Tianxiang Luo,
  • Jianwu Zhang,
  • Yaping Sun,
  • Chuangtuo Xia

摘要

Carbonates, the main components of oil shale that influence oil and gas accumulation, are becoming increasingly significant in oil shale studies. This paper aims to examine the formation mechanisms of various carbonate minerals in shale and their impact on oil enrichment. In the Dongying Depression, two predominant types of carbonate minerals have been identified: micritic carbonate and grain carbonate. Micritic carbonate primarily forms through biogenic processes, where alternating carbonate and clay mineral laminae result from the periodic stratification of lacustrine water bodies. These layers are relatively thin. Micritic carbonate rocks contain low organic matter and predominantly feature narrow slit-like pores, leading to a tight pore structure that hinders oil shale accumulation. In contrast, grain carbonate formation is governed by diagenetic processes. Influenced by deep fluids, these carbonate laminae are mainly composed of lens-shaped, coarsely crystalline calcite and exhibit significant thickness. Grain carbonate rocks have a relatively high organic matter content, with pore spaces primarily consisting of bottleneck- and slit-shaped throats. This configuration enhances reservoir capacity and creates favorable conditions for oil shale accumulation.