地学前缘 ›› 2021, Vol. 28 ›› Issue (1): 90-103.DOI: 10.13745/j.esf.sf.2020.5.10

• 盆地层序沉积 • 上一篇    下一篇

塔里木盆地顺托果勒地区奥陶系鹰山组—恰尔巴克组地层划分对比研究

张智礼(), 李慧莉, 焦存礼, 高晓鹏   

  1. 中国石化石油勘探开发研究院, 北京 100083
  • 收稿日期:2019-12-05 修回日期:2020-05-19 出版日期:2021-01-25 发布日期:2021-01-28
  • 作者简介:张智礼(1965—),男,博士,高级工程师,古生物与地层学专业。E-mail: zhangzhili767@sina.com
  • 基金资助:
    国家自然科学基金项目(41672142);国家科技重大专项“海相碳酸盐岩层系油气田形成规律与勘探评价方法”(2017ZX05005-002-006);中国科学院战略性先导科技专项A类项目“深层油气分布规律与勘探评价”(XDA140104)

Stratigraphic division and correlation of the Ordovician Yingshan and Qrebake Formations in the Shuntogole area, Tarim Basin

ZHANG Zhili(), LI Huili, JIAO Cunli, GAO Xiaopeng   

  1. SINOPEC Petroleum Exploration and Production Research Institute, Beijing 100083, China
  • Received:2019-12-05 Revised:2020-05-19 Online:2021-01-25 Published:2021-01-28

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摘要：

塔里木盆地奥陶系是重要的烃源岩和储集层,建立顺托果勒地区奥陶系鹰山组、一间房组及恰尔巴克组等时地层格架是开展地质研究和发现油气资源的基础。本文基于岩电特征,建立碳同位素对比标准,完善了奥陶系台地到斜坡相区牙形石化石带,确立顺托果勒地区奥陶系鹰山组—恰尔巴克组划分对比格架,并阐明鹰山组—恰尔巴克组特征及展布规律。研究表明,在完善牙形石化石带序列的基础上,指出鹰山组、一间房组及恰尔巴克组边界处碳同位素变化明显,地层序列发育齐全。鹰山组沉积时期是塔里木盆地台地发育的鼎盛时期,沉积环境稳定,水深基本一致,碳酸盐沉积速率虽较大但却相近。鹰山组厚度大且分布较稳定,一般在700 m左右,可细划分为4段,各段厚度为130~150 m。一间房组沉积时期,顺托果勒地区的沉积环境为一个碳酸盐缓坡环境,碳酸盐沉积速率相对较小。一间房组厚度在100~250 m不等,在顺南地区厚度最大,一般超过了200 m,最大可达250 m;古隆地区与顺北地区次之,厚度一般为130~150 m;跃进地区厚度最小,只有100 m。一间房组可细分为上下2段:上段厚度一般为60~70 m;下段为70~80 m左右。恰尔巴克组沉积时期,研究区处于一个较深水斜坡环境,沉积速率小,沉积环境稳定,全区厚度相近,而且厚度较小,一般为30~40 m。

关键词: 碳同位素, 牙形石带, 奥陶系, 鹰山组, 一间房组, 顺托果勒地区, 塔里木盆地

Abstract:

The Ordovician in the Tarim Basin is an important period of source rock and reservoir formations in the basin. The establishment of an isochronous stratigraphic framework for the Ordovician Yingshan, Yijianfang and Qrebake Formations in the Shuntuoguole area is the basis for geological research and discovery of oil and gas resources. In this contribution, based on the characteristics of petroelectricity, we established the standard of carbon isotope correlation, perfected the conodont zones from Ordovician platform to slope facies, established the division correlation framework of the Ordovician Yingshan-Qrebake Formation and revealed its features and distribution patterns. In perfecting the sequence of conodonts zones, we found that the carbon isotope obviously changed at the boundaries of the three formations, and the stratigraphic sequence was well developed. The sedimentary period of the Yingshan Formation was the peak period of platform development in the Tarim Basin. The sedimentary environment was stable, the water depth basically unchanged, and the carbonate sedimentary rate was relatively high and remained nearly constant. The Yingshan Formation was about 700 m thick in general and its distribution relatively stable. It can be divided into four members, each member was 130-150 m thick. The thickness of the Yijianfang Formation varied from 100-250 m. The Shunnan section was the thickest, with thickness generally over 200 m and possibly reaching 250 m; the Gulong and Shunbei sections came in second, they were generally 130-150 m thick; and the Yuejin section was the thinnest, only 100 m thick. During the sedimentary period of the Yijianfang Formation, the sedimentary environment of the Shuntuoguole area was a carbonate gentle slope environment, and the carbonate sedimentary rate was relatively low. The Yijianfang Formation can be divided into two members: the ~60-70 m thick upper member and the ~70-80 m thick lower member. During the sedimentary period of the Qrebake Formation, the study area was in a deep-water slope environment, with low sedimentary rate, stable sedimentary environment and uniform thinness, generally only about 30-40 m thick, over the whole area.

Key words: carbon isotope, conodont zones, Ordovician, Yingshan Formation, Yijianfang Formation, Shuntuoguole area, Tarim Basin

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