石油学报 ›› 2011, Vol. 32 ›› Issue (5): 797-805.DOI: 10.7623/syxb201105009

• 地质勘探 • 上一篇    下一篇

伊犁盆地下石炭统阿克沙克组沉积特征及演化

熊绍云  余朝丰  李玉文  黄  羚   

  1. 中国石油杭州地质研究院  浙江杭州  310023
  • 收稿日期:2010-12-01 修回日期:2011-05-25 出版日期:2011-09-25 发布日期:2011-11-28
  • 通讯作者: 熊绍云
  • 作者简介:熊绍云,男,1979年2月生, 2008年获中国地质大学(北京)硕士学位,现为中国石油杭州地质研究院工程师,主要从事沉积储层研究工作。
  • 基金资助:

    中国石油天然气股份有限公司科学研究与技术开发项目(2008D-0705-02)“准噶尔盆地油气预探研究”资助。

Sedimentary characteristics and evolution of the Lower Carboniferous Akeshake Formation in the Yili Basin

XIONG Shaoyun  YU Chaofeng  LI Yuwen  HUANG Ling   

  • Received:2010-12-01 Revised:2011-05-25 Online:2011-09-25 Published:2011-11-28

摘要:

伊犁盆地下石炭统阿克沙克组按岩性自下而上分为碎屑岩段、碎屑岩夹碳酸盐岩段以及碳酸盐岩段,通过详细的野外地质考察和室内分析,识别出6种沉积相、14种沉积亚相。碳酸盐沉积是伊犁石炭纪海相盆地重要沉积,发育有混积滨岸相、局限-开阔台地相、台盆相、台地边缘礁滩相、台地前缘斜坡-坡脚相。伊犁盆地早石炭世晚期沉积演化明显受构造活动、古地形、海平面升降、物源等影响,可分为3个阶段:①早期发育辫状河三角洲相,沉积物主要来自北天山一带;②中期发育辫状河三角洲相和混积滨岸相、开阔台地相、台盆相,靠近物源区的尼勒克水泥厂一带为辫状河三角洲相和混积滨岸相,昭苏阿克沙克沟一带为混积滨岸相,科克苏峡谷一带为开阔台地相,切克台沟一带为台盆相;③晚期盆地处于拗陷阶段,陆源物质输入少,为典型台地碳酸盐沉积时期,沉积相在平面上呈向西敞开、向东收敛的带状分布,由于靠近物源,尼勒克水泥厂一带仍存在混积滨岸相。

关键词: 伊犁盆地, 下石炭统, 阿克沙克组, 沉积相, 沉积演化

Abstract:

The Lower Carboniferous Akeshake Formation in the Yili Basin can be lithologically divided into three sections from bottom to top, i.e. the clastis interval,clastis-with carbonate interval and carbonate interval.Based on detailed field geological investigations and laboratory analyses,six facies and fourteen sub-facies were identified from the Akeshake Formation.Carbonates are important deposits in the Yili Carboniferous marine basin,where they are deposited in hybrid coast facies,restricted-open platform facies,platform-basin facies,platform-edge reef-flat facies,and platform fore-edge slope and basal-slope facies. During the late period of early Carboniferous, the depositional evolution of the Yili Basin was obviously influenced by tectonic activities, paleotopography, sea-level fluctuation, paleoclimate and provenance,and it can be divided into three stages:① A braided delta facies developed in the early period and sediments mainly came from the northern Tianshan area. ② Braided delta, hybrid coast, open platform and platform-basin facies developed in the middle period, of which the braided delta and hybrid coast facies are distributed in the Nileke Cement Plant area adjacent to the Tianshan provenance,the hybrid coast facies occurs in the Akeshakegou area in Zhaosu County,while the open platform and platform-basin facies are distributed in the Kekesu Gorge and Qieketaigou areas, respectively. ③ The Yili Basin was subsiding with minor input of terrigenous materials in the late period,experiencing a typical carbonate-platform depositional stage when sedimentary facies showed a banded distribution horizontally open to the west and converged to the east, there still existed a hybrid coast facies along the Nileke Cement Plant area because of the adjacence to provenance.

Key words: Yili Basin, Lower Carboniferous, Akeshake Formation, sedimentary facies, sedimentary evolution