新疆石油地质

新疆石油地质 ›› 2005, Vol. 26 ›› Issue (5): 536-539.

• 油气勘探 • 上一篇    下一篇

塔里木盆地顺1井几丁石发现的意义

蔡习尧1, 毛树华2, 陈跃1, 邹元荣1, 陈强路1, 尤东华1   

  1. 1.中国石化 石油勘探开发科学研究院 西部分院,乌鲁木齐830011;
    2.中国石化 江汉油田分公司 勘探开发研究院,湖北潜江433124
  • 收稿日期:2005-01-15 出版日期:2005-10-01 发布日期:2020-11-23
  • 作者简介:蔡习光(1963-),男,湖北武穴人,高级工程师,地层古生物,(TeI)0991-3676939(E-mail)caixiyao@sohu.com

Significance of Discovery of Chitinozoans from Late Ordovician to Early Silurian in Shun-1 Well, Tarim Basin

CAI Xi-yao1, MAO Shu-hua2, CHEN Yue1, ZOU Yuan-rong1, CHEN Qiang-lu1, YOU Dong-hua1   

  1. 1. West Branch, Research Instilute of Petroleum Exploration and Development, Sinopee, Urumqi 83001 I, China;
    2. Research Institute of Exploration and Development, Jianghan Oilfield Company, Sinopec, Qianjiang, Hubei 433 124, China
  • Received:2005-01-15 Online:2005-10-01 Published:2020-11-23

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摘要： 顺1井中下志留亚系发育齐全,自下而上分为兰德维利统柯坪格组、塔塔埃尔塔格组与文洛克统依木干他乌组。柯坪塔格组又可细分为三段:上、下为砂岩段,中间为泥岩段,颜色为灰色、灰绿色。塔塔埃尔塔格组两分,下段为紫红色泥岩,上段为红褐色、红色泥岩与粉砂岩不等厚互层。依木干他乌组岩性为棕色、棕褐色泥岩夹粉砂岩与细砂岩;上奥陶统却尔却克组仅钻揭110m,岩性主要为灰、深灰色泥岩。各组之间岩性、电性特征均较明显。在柯坪塔格组下段与却尔却克组,上部获丰富的几丁T石,鉴定出了3属5种,1个比较种与众多的未定种,详细地计论了几丁石属种的时代分布与地理分布,根据化石群特征,可将其归入Conochitinaelecla与Conochinasp.2化石带。依据几丁石带在全球范围空间的分布规律,确定了顺1井含化石的地层时代,并以岩石地层为基础、生物地层为依据,结合测井地层,对顺1井中下志留亚系进行了重新划分,首次为本区中下志留亚系兰德维利统的划分与对比提供了重要的化石依据。

关键词: 塔里木盆地, 几丁石, 地层划分

Abstract: The Lower Silurian rocks are fully developed in Shun-IWell with classification of Llandoverian Kalpintag formation, Tataaiertag formation and Wenlokian Yimugantawu formation. The Kalpintag formation is subdivided into three members as upper and lower sand-stone members and middle mudstone member with grey and grey-greenish colors. Tataaiertag formation is subdivided into upper member with red-brownish and red mudstone intercalated with siltstone and lower member with purple-red mudstone. The Yimugantawu formation is composed of brown and dark brown mudstones intercalated with siltstone and fine grained sandstone. The Charchag formation of Upper Ordovician with lithology of grey and dark grey mudstone is only penetrated by 1 10m in thickness. The lithological and electrical properties of these formations are distinct. Prolifie Chitinozoan fossils were discovered from lower member of Kalpintag formation and Charchag formation, and five species of three genera and numerous others were identified. Furthermore, their ages and geographic distributions are discussed in detail. Based on the characteristics of the fossil assemblages, they are assigned to the Conochitina elaca and Conochitina sp.2 zones, respectively. According to the spatial distribution of Chitinozoans in global scope, the age of the Chitinozoan-bearing zones in Shun-1 Well is determined and the reclassification of its Lower Silurian is made by the litho stratigraphy, bio-stratigraphy and logging stratigraphy. It is the first time to provide important fossil evidences for the classification and the correlation of Lower Silurian in this area.

Key words: Tarim basin, Chitinozoan, stratigraphic classification

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