塔里木盆地巴楚隆起寒武系划分与对比
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摘要
巴楚隆起井下寒武系发育齐全,划分为3统7段,自下而上为下统碎屑岩段、白云岩段、下含膏白云岩段,中统盐下碳酸盐岩段、膏盐岩段、上含膏白云岩段与上统纯白云岩段,各段之间电性特征明显。在碎屑岩段获丰富的小壳与藻类化石,详细地讨论了小壳化石的时空分布,确定巴楚隆起井下含小壳化石地层的时代为早寒武世早期,并与地表露头剖面进行了对比,认为碎屑岩段与玉尔吐斯组上部为同时异相关系,盐下碳酸盐岩段对应于沙依里克组,并作为区域地层对比标志层。地震层序地层可将寒武系划分为3个超层序,分别对应与3个统;钻井层序地层可划分为2个半超层序、5个层序。该区寒武系的划分与对比为其它学科进一步研究奠定了坚实的地层学基础。
The Cambrian rocks commonly occured in the wells of Buchu uplift in Tarim basin could be divided into three series and seven members.They are clastic member,dolomite member and gypsum-bearing dolomite member in the lower series;subsalt carbonatite member,gypsum-salt member and gypsum-bearing dolomite member in the middle series,and pure dolomite member in the upper series,based on their obviously different electrical properties.The abundance fossils of small shell and algae found in the clastic member are discussed in space-time distribution in detail,and the age of the strata with small shell is determined as the early of Early Cambrian in wells of Bachu uplift.The outcrop section correlation shows that the clastic member and Yurtus formation belong to the relation of the same age but different facies.The subsalt carbonatite member corresponds to Shaylik formation,which can be considered as marker bed for formation correlation in this area.In addition,according to seismic sequence stratigraphy,the Cambrian strata can be divided into three super-sequences which correspond to three series;in terms of drilling sequence stratigraphy,it can be two and half super-sequences and five sequences.The classification and the correlation of the Cambrian strata in this area establish a stable stratigraphic foundation for further studies related to Bachu uplift.
The Cambrian rocks commonly occured in the wells of Buchu uplift in Tarim basin could be divided into three series and seven members.They are clastic member,dolomite member and gypsum-bearing dolomite member in the lower series;subsalt carbonatite member,gypsum-salt member and gypsum-bearing dolomite member in the middle series,and pure dolomite member in the upper series,based on their obviously different electrical properties.The abundance fossils of small shell and algae found in the clastic member are discussed in space-time distribution in detail,and the age of the strata with small shell is determined as the early of Early Cambrian in wells of Bachu uplift.The outcrop section correlation shows that the clastic member and Yurtus formation belong to the relation of the same age but different facies.The subsalt carbonatite member corresponds to Shaylik formation,which can be considered as marker bed for formation correlation in this area.In addition,according to seismic sequence stratigraphy,the Cambrian strata can be divided into three super-sequences which correspond to three series;in terms of drilling sequence stratigraphy,it can be two and half super-sequences and five sequences.The classification and the correlation of the Cambrian strata in this area establish a stable stratigraphic foundation for further studies related to Bachu uplift.
引文
[1]贾承造,张师本,吴绍祖,等.塔里木盆地及周边地层[M].北京:科学出版社,2004.
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[3]张师本,黄智斌,朱怀诚.塔里木盆地覆盖区显生宙地层[M].北京:石油工业出版社,2004.
[4]张师本,倪寓南,龚福华,等.塔里木盆地周缘地层考察指南[M].北京:石油工业出版社,2003.
[5]赵治信,张桂芝,肖继南.新疆古生代地层及牙形石[M].北京:石油工业出版社,2000.
[2]张师本.塔里木盆地震旦纪-二叠纪地层古生物(Ⅱ)柯坪-巴楚分册[M].北京:石油工业出版社,1992.
[3]张师本,黄智斌,朱怀诚.塔里木盆地覆盖区显生宙地层[M].北京:石油工业出版社,2004.
[4]张师本,倪寓南,龚福华,等.塔里木盆地周缘地层考察指南[M].北京:石油工业出版社,2003.
[5]赵治信,张桂芝,肖继南.新疆古生代地层及牙形石[M].北京:石油工业出版社,2000.
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