柴达木盆地北缘侏罗系陆相低熟页岩孔隙发育特征及主控因素
作者:
基金项目:

本文为国家科技重大专项项目(编号2016ZX05034001- 006)、陕西省自然科学基金项目(编号2018JM4003、2018JM4031)、陕西省油气成藏地质学重点实验室开放基金资助项目(编号 PAG- 202002)共同资助的成果。


Characteristics and main controlling factors of pore structures in low thermal maturity continental shale of Jurassic, northern Qaidam basin
Author:
  • 摘要
  • | |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • | |
  • 文章评论
    摘要:

    为了深入研究柴达木盆地北缘陆相低成熟页岩储层微观孔隙发育特征及主控因素,本文针对同一钻井内不同深度的页岩样品采用高压压汞、低温氮气吸附、低温二氧化碳吸附、核磁共振等多种测试手段,实现了对孔隙结构的全尺度定量综合表征。研究结果表明:在目前低成熟度条件下,页岩孔径分布呈现多峰式,总体孔径大多小于25nm,其中又以0. 4nm左右的微孔和2~3nm的介孔为主,贡献了主要的孔容和比表面积,孔隙形态上多为四周开放的平行板或倾斜板狭缝状孔。同时还存在粒间孔、微裂缝等微米级孔隙,造成核磁共振曲线的双峰或三峰式分布。当前阶段由于有机质成熟度低,宏孔的孔体积与埋深呈负相关、与TOC、黏土矿物含量呈正相关,介孔的孔体积与脆性矿物含量呈负相关,孔体积和比表面积与R o呈正相关,微孔的孔体积和比表面积与TOC、脆性矿物含量呈正相关。陆相页岩中不同孔隙的发育主要受控于埋深、TOC、R o、脆性矿物含量、黏土矿物含量等因素中的一种或多种,随着有机质演化程度的增加,埋深及脆性矿物含量在控制孔隙发育方面作用减弱,TOC、R o和黏土矿物含量成为孔隙发育和演化的主要影响和控制因素。

    Abstract:

    In order to study and identify the main controlling factors of the microscopic pore structuresin the low thermal maturity continental shale of Jurassic in the northern Qaidam Basin, the high- pressure mercury intrusion, low- temperature nitrogen adsorption, low- temperature carbon dioxide adsorption, nuclear magnetic resonance and other testing methods were used onshale samples from different depths in the same well. Finally, the full- scale quantitative and comprehensive characterization of pore structure can be realized. The results show that under the present low thermal maturity conditions, the pore size distribution of shale is multi- modal, the total pore size is mostly less than 25 nm, in which the main pore volume and specific surface area are mainly composed of 0. 4 nm micropores and 2~3 nm mesopores,most of the pores are parallel plates or inclined plates with slit- like pores. At present, due to the low maturity of organic matter, the pore volume of macropores is negatively correlated with the burial depth, positively correlated with TOC and clay mineral content.The pore volume of mesopores is negatively correlated with brittle mineral content, the pore volume and specific surface area are positively correlated with R o.The pore volume and specific surface area of micropores are positively correlated with TOC and brittle mineral content. The development of different pores in continental shale is mainly controlled by one or more factors such as burial depth, TOC, R o, brittle mineral content, clay mineral content, etc. With the increase of organic matter evolution degree, burial depth and brittle mineral content play a weak role in controlling pore development, and TOC, R o and clay mineral content become the main influencing and controlling factors of pore development and evolution.

    参考文献
    相似文献
    引证文献
引用本文

张云鹏,李玉宏,郭望,韩伟,李永红,王伟超.2021.柴达木盆地北缘侏罗系陆相低熟页岩孔隙发育特征及主控因素[J].地质学报,95(2):565-577.
ZHANG Yunpeng, LI Yuhong, GUO Wang, HAN Wei, LI Yonghong, WANG Weichao.2021. Characteristics and main controlling factors of pore structures in low thermal maturity continental shale of Jurassic, northern Qaidam basin[J]. Acta Geologica Sinica,95(2):565-577.

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2020-03-08
  • 最后修改日期:2020-10-12
  • 录用日期:2020-10-12
  • 在线发布日期: 2020-10-23