塔西北下寒武统肖尔布拉克组层序划分及台地沉积演化模式

doi:10.11743/ogg20170116

摘要/Abstract

摘要：

基于野外露头观察和室内薄片鉴定工作，详细描述了塔里木盆地阿克苏地区下寒武统肖尔布拉克组微生物碳酸盐岩的展布特征，建立了层序地层格架，分析了肖尔布拉克期碳酸盐台地的演化过程。研究认为，肖尔布拉克组可分为两个三级层序：下部层序SQ1整体为一套波状微生物席，处于中-内缓坡沉积环境，对应缓坡型台地发育阶段；上部层序SQ2的海侵期是缓坡型台地向弱镶边台地的转变阶段，斜坡以风暴沉积为主，微生物岩不发育，而高地则以大型进积微生物礁建隆为主，主要通过丛状表附菌的自身骨架生长和微生物粘结方式成隆。高位期是弱镶边台地发育阶段，台缘和台内相分异明显。台缘区早期发育房室状表附菌层，晚期发育小型进积微生物礁群，由微生物粘结成礁，而台内区为低能微生物滩，缺乏高位早期建造，晚期以层纹石建造、泡沫绵层石和叠层石建造为主，其形成与粘性微生物席有关。

关键词: 微生物岩, 层序, 肖尔布拉克组, 下寒武统, 碳酸盐台地, 塔里木盆地

Abstract:

Based on the outcrop observation and thin section identification,the distribution of microbial carbonate is described and sequence stratigraphy framework is established in the Lower Cambrian Xiaoerbulak Formation in the Aksu area,Tarim Basin.Finally the carbonate platform evolution during the deposition period of the Xiaoerblak Formation is summarized and rebuilt.The results show that the Xiaoerblak Formation can be subdivided into two third-order sequences.The lower part,SQ1,corresponds to a set of microbial mats which are middle-inner ramp deposition corresponding to the stage of ramp carbonate platform.The upper part is SQ2,which is a TST,and represents a transition from ramp carbonate platform to slightly rimmed shelf carbonate platform.On the slope the tempestite deposited without microbial carbonate,while on the paleokarst highland,the large-scale transgressive mircobial reef was built through the microbial skeleton growth and correlatively bonding effect.The HST represents the stage of slightly rimmed shelf carbonate platform,where the margin and inner-platform are sharply different.On the platform margin,the EHST is characterized with chambered Epiphyton bioherm,while the LHST features some small-scale transgressive microbial bonding reefs.The inner-platform developed microbial shoal facies during the high stand,and its EHST is absent.The inner-platform LHST is characterized by laminites,spongiostromata stromatolites and stromatolites.Their formation is related to the sticky microbial mats.

Key words: microbialite, sequence, Xiaoerblak Formation, Lower Cambrian, carbonate platform, Tarim Basin

中图分类号:

TE121.3

白莹,罗平,周川闽,等. 塔西北下寒武统肖尔布拉克组层序划分及台地沉积演化模式[J]. 石油与天然气地质, 2017, 38(1): 152-164. doi: 10.11743/ogg20170116 Bai Ying,Luo Ping,Zhou Chuanmin,et al. Sequence division and platform sedimentary evolution model of the Lower Cambrian Xiaoerbulak Formation in the NW Tarim Basin[J]. Oil & Gas Geology, 2017, 38(1): 152-164. doi: 10.11743/ogg20170116

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