地学前缘 ›› 2016, Vol. 23 ›› Issue (5): 113-118.DOI: 10.13745/j.esf.2016.05.012

• 油气成藏 • 上一篇    下一篇

风化作用对烃源岩有机质丰度的影响：以柴北缘石灰沟克鲁克组为例

 杨元元, 马寅生, 刘成林, 程海艳   

  1. 1. 中国地质科学院 页岩油气调查评价重点实验室， 北京 100081
    2. 中国地质地质科学院 地质力学研究所， 北京 100081
  • 收稿日期:2015-10-15 修回日期:2016-01-15 出版日期:2016-09-15 发布日期:2016-09-15
  • 作者简介:杨元元(1985—)，女，博士，助理研究员，主要从事油气地球化学、油气成藏方向研究。
  • 基金资助:

    中国地质调查局地质调查项目(1212011120964)

Influence of weathering on abundance of source rocks：A case study of Keluke Formation of Upper Carboniferous in the Shihuigou area, North Margin of Qaidam Basin.

 YANG  Yuan-Yuan, MA  Yin-Sheng, LIU  Cheng-Lin, CHENG  Hai-Yan   

  1. 1. Key Lab of Shale Oil and Gas Geological Survey, Chinese Academy of Geological Sciences, Beijijng 100081, China
    2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
  • Received:2015-10-15 Revised:2016-01-15 Online:2016-09-15 Published:2016-09-15

PDF (PC)

16711

摘要：

柴达木盆地是我国西北大型含油气盆地之一，已发现的油气主要来自中新生界。近期研究发现石炭系也是柴达木盆地重要烃源岩层位，且据野外地质调查发现的大量石炭系油气显示，油源对比证实其来源于石炭系烃源岩。柴达木盆地石炭系油气资源潜力很大，是柴达木盆地油气勘探的一个新层系和新领域。由于钻遇柴达木盆地石炭系的钻井很少，石炭系资源评价中烃源岩多采用野外露头样品。但露头样品一般都遭受了不同程度的风化作用，风化作用对烃源岩的丰度有一定的影响。文中基于相同的地质背景开展了露头和岩心样品烃源岩地化参数研究，确定了柴北缘石灰沟地区石炭系烃源岩风化因子，并通过风化因子来恢复露头烃源岩样品的有机质丰度。其结果显示恢复后的柴北缘地区石炭系露头烃源岩为中—好烃源岩。

关键词: 风化因子, 有机碳恢复, 石炭系, 柴北缘地区

Abstract:

Qaidam Basin is the one of the large petroliferous basins in the western China, and the hydrocarbons have been found mainly in the Mesozoic and Cenozoic strata. Recent studies have shown that the Carboniferous is one of the main source rocks in Qaidam Basin. The discovery of oil seepage and the similar characteristics of biomarkers with the carboniferous source rock show that the Qaidam Basin has large Carboniferous hydrocarbons resource potential and serves as a new strata and area for strategic breakthrough in hydrocarbons resources exploration. The number of wells that drilled into the Carboniferous strata in the Qaidam Basin is small, and the parameters of outcrop samples were used in the Carboniferous resource evaluation. Outcrop samples generally have undergone weathering, which have impact on the abundance of source rock. In this paper, through detailed comparison of outcrop and core samples to determine the factors of weathered hydrocarbon source rocks in North Margin of Qaidam Basin, and restore organic matter abundance of outcrop source rocks by weathering factor. After recovery, the outcrops of Carboniferous in the North Margin of Qaidam Basin are middlegood source rocks.

Key words: weathering factor, restoration of organic carbon, Carboniferous, North Margin of Qaidam Basin

中图分类号: