石油学报 ›› 2020, Vol. 41 ›› Issue (7): 809-820.DOI: 10.7623/syxb202007003

• 地质勘探 • 上一篇    下一篇

侵出式火山机构储层的分布模式——以伊通火山群为例

唐华风1,2,3, 戴岩林3, 郭天婵1,2,3, 刘钊3, 何贤培3, 张一弛3   

  1. 1. 东北亚生物演化与环境教育部重点实验室 吉林长春 130061;
    2. 自然资源部东北亚矿产资源评价重点实验室 吉林长春 130061;
    3. 吉林大学地球科学学院 吉林长春 130061
  • 收稿日期:2019-07-05 修回日期:2019-12-04 出版日期:2020-07-25 发布日期:2020-08-08
  • 通讯作者: 唐华风,男,1979年6月生,2001年获吉林大学学士学位,2007年获吉林大学博士学位,现为吉林大学地球科学学院教授,主要从事火山地层和火山岩储层综合研究。
  • 作者简介:唐华风,男,1979年6月生,2001年获吉林大学学士学位,2007年获吉林大学博士学位,现为吉林大学地球科学学院教授,主要从事火山地层和火山岩储层综合研究。Email:tanghfhc@jlu.edu.cn
  • 基金资助:

    国家自然科学基金重大项目(No.41790453)、国家科技重大专项(2016ZX05026-004)和吉林省自然科学基金项目(20170101001JC)资助。

Distribution pattern of reservoirs in the extrusive volcanic edifice: a case study of the Yitong volcanoes

Tang Huafeng1,2,3, Dai Yanlin3, Guo Tianchan1,2,3, Liu Zhao3, He Xianpei3, Zhang Yichi3   

  1. 1. Key-Lab for Evolution of Past Life and Environment in Northeast Asia, Ministry of Eduation, Jilin Changchun 130061, China;
    2. Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources, Jilin Changchun 130061, China;
    3. College of Earth Sciences, Jilin University, Jilin Changchun 130061, China
  • Received:2019-07-05 Revised:2019-12-04 Online:2020-07-25 Published:2020-08-08

摘要:

松辽盆地的侵出式火山机构中可赋存气藏,其储层特征明显有别于爆发式或喷溢式火山机构。为了明确侵出式火山机构的储层分布特征,以伊通火山群为例,根据野外露头调查、岩石组构特征、压氦法孔隙度测量和图像法宏观面缝率测量,分别对代表侵出式火山机构下部、中部和上部的西尖山火山、大孤山火山和东小山火山开展了储层分布模式分析,并讨论了柱状节理几何形态与裂缝密度和地层渗透性的关系。侵出式火山机构的储层为裂缝-孔隙型,发育丰富的冷凝收缩缝(柱状节理缝)、少量的气孔和杏仁孔以及微量的构造裂缝,具有低—中孔隙度、高渗透率的特征。受火山岩冷凝收缩作用和挥发份逸出作用控制,整个侵出式火山机构的储层可以通过柱状节理沟通。有利储层多分布在火山机构的顶部,厚度为数十米,中心相带的储层物性相对较好,向边部变差。整体上储层与地层的厚度比较小。针对未遭受剥蚀的侵出式火山机构,可采用揭示其火山中心相带上层的方法,而对于遭受剥蚀严重的侵出式火山机构,可采用揭示其翼部上层的方法寻找有利储层位置。

关键词: 伊通火山群, 中新世, 火山岩, 柱状节理, 侵出式火山机构, 储层分布模式

Abstract:

Gas reservoirs can occur in the extrusive volcanic edifice of Songliao Basin, whose reservoir characteristics are clearly different from those of explosive or effusive volcanic edifices. To clarify the reservoir distribution characteristics of the extrusive volcanic edifice, taking the Yitong volcanoes as an example, based on field outcrop survey, rock fabric characteristics, porosity measurement with helium injection method and macroscopic surface fracture ratio measurement with image method, the paper analyzes the distribution patterns of reservoirs in the Xijianshan volcano, Dagushan volcano and Dongxiaoshan volcano representative of the lower, middle and upper part of the extrusive volcanic edifice, respectively, and also discusses the relationship between the geometry of columnar joints and fracture density, formation permeability. The reservoirs of the extrusive volcanic edifice are classified as fracture-pore type, with the development of abundant condensed shrinkage joints (columnar joints), a small number of vesicles and amygdales, and a little amount of tectonic fractures, characterized by low-medium porosity and high permeability. Controlled by the condensation and shrinkage of volcanic rocks and the escape of volatile matter, the reservoirs of the entire extrusive volcanic edifice can be communicated through columnar joints. Favorable reservoirs are mostly distributed in the top of the volcanic edifice, with a thickness of about tens of meters. The physical properties of the reservoir in the central facies are relatively good, and become worse toward the edges. Overall, the thickness ratio of the reservoir to formation is small. For the extrusive volcanic edifice uneroded, the method revealing the upper layer of the facies of the volcanic focus can be used to find the reservoirs, but for the extrusive volcanic edifice severely eroded, the method revealing the upper layer of its limbs can be used to find the favorable reservoirs.

Key words: Yitong volcanoes, Miocene, volcanic rock, columnar joints, extrusive volcanic edifice, distribution pattern of reservoirs

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