新疆石油地质

新疆石油地质 ›› 2002, Vol. 23 ›› Issue (5): 382-384.

• 油气勘探 • 上一篇    下一篇

塔里木盆地石炭系碳酸盐岩同位素地球化学特征

朱如凯, 罗平, 罗忠   

  1. 中国石油 石油勘探开发科学研究院 实验中心油气储层重点实验室,北京 100083
  • 收稿日期:2001-10-16 出版日期:2002-10-01 发布日期:2020-08-11
  • 作者简介:朱如凯（1968-）,湖南湘潭人,男,博士,从事沉积储集层研究。联系电话：010-62098623
  • 基金资助:
    “九五”国家重点科技攻关项目99-111-01-02-04支持项目

The Isotope Geochemistry Characteristics of Carbonate Rocks in Carboniferous in Tarim Basin

ZHU Ru-kai, LUO Ping, LUO Zhong   

  • Received:2001-10-16 Online:2002-10-01 Published:2020-08-11
  • About author:ZHU Ru-kai (1968-), Male, Doctor, Petroleum Geology, the Key Lab for Oil and Gas Reservoir, Research Institute of Petroleum Exploration and Development, CNPC, Beijing 100083, China

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摘要： 从塔里木盆地石炭系碳酸盐岩的δ13C(‰PDB)为-4.68‰~+6.7‰,δ18O(‰PDB)为-9.72‰~-1.8‰来看,基本上属海相环境,从塔北经满西至巴楚地区,石炭系碳酸盐岩沉积时受淡水和陆源有机碳影响逐渐减少。经计算,石炭系碳酸盐岩沉积时的平均古水温为25℃,说明海水较温暖。碳酸盐岩87Sr/86Sr平均值为0.70860,纵向上生屑灰岩段87Sr/86Sr平均值为0.70854,标准灰岩段为0.70821,小海子灰岩段为0.70794,说明石炭纪海侵规模不断增大,海水深度不断增加。平面上由西向东北方向87Sr/86Sr比值增大,说明石炭纪海侵是由西向东侵入的。

关键词: 塔里木盆地, 石炭纪, 海相环境, 碳同位素, 氧同位素, 锶同位素, 海侵

Abstract: It is shown from Tabei, Manxi to Bachu areas that the influences of freshwater and terrigenous organic carbons on Carboniferous carbonate sediments in Tarim basin are gradually going down. In general, the carbonate rocks are of marine sediments with δ 13C(‰PDB) of -4.68‰~+6.7‰ and δ 18O (‰PDB) of -9.72‰~-1.8‰. By calculation, the averaging paleo-temperature of formation water is 25℃, showing the warmer primary marine water. And the growing marine transgression and water depth are indicated by average values of; 87Sr/86Sr being 0.70860 for the carbonate rock, 0.70854 for the bioclastic limestone section, 0.70821 for standard limestone section and 0.70794 for Xiaohaizi limestone section in vertical. While from west to northeast the average values of 86Sr are increasing in plane, indicating that the marine transgression during the Carboniferous period happened in direction from west toward east.

Key words: Tarim basin, Carboniferous, marine environment, Carbon isotope, Oxygen isotope, Strontium isotope, marine transgression

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