塔河南盐下地区中奥陶统一间房组沉积环境分析
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摘要
通过对塔河南盐下地区28口钻井岩心中奥陶统一间房组的详细描述和3 200余块薄片的鉴定,确认其主要的岩石类型有生屑灰岩、生物灰岩、藻球粒灰岩、含核形石灰岩、鲕粒灰岩、内碎屑灰岩、微晶灰岩、海绿石灰岩。在这些碳酸盐岩中,藻类、棘皮类、双壳类以及造礁生物苔藓虫、珊瑚、层孔虫、海绵等生物大量出现,表明一间房组沉积时期总体应为一个水体循环状况良好、盐度正常充氧的浅海沉积环境。在综合分析其岩石学特征、测井资料,结合地震资料,划分出台内滩、滩间、点礁三种沉积相,并讨论了一间房组早、晚期沉积相的空间展布特征,编制了各时期的古地理图,为油气勘探提供了地质指导。
The Middle Ordovician Yijianfang Formation mainly consists of carbonates in the south of Tarim River area of Xinjiang.The authors have observed 28 cores and identified 3200 slices.They think the rock types are bioclastic limestone,biolithite,algal pelleted limeston,oncolite limestone,oolitic limestone,intraclastic limestone,micrite,glauconite limestone.Algae,echinoderm,bivalve,and reef-building organisms including bryozoan,coral,stromatoporoids,and sponge are conserved in the carbonate of the Yijianfang Formation.This indicates a normal shallow marine environment with water cycle,normal salinity and sufficient oxygen.Based on the integrative analysis of seismic data,log data and petrologic character,three types of sedimentary facies can be recognized in the Yijianfang Formation.They are platform shoal,intershoal,and patch reef.Based on this,the paleogeographic maps about the early Darriwilian Stage and late Darriwilian Stage are mapped,respectively.At last,the authors describe the depositional facies distribution in space.This is very important for people to engage oil and gas exploration in study area.
The Middle Ordovician Yijianfang Formation mainly consists of carbonates in the south of Tarim River area of Xinjiang.The authors have observed 28 cores and identified 3200 slices.They think the rock types are bioclastic limestone,biolithite,algal pelleted limeston,oncolite limestone,oolitic limestone,intraclastic limestone,micrite,glauconite limestone.Algae,echinoderm,bivalve,and reef-building organisms including bryozoan,coral,stromatoporoids,and sponge are conserved in the carbonate of the Yijianfang Formation.This indicates a normal shallow marine environment with water cycle,normal salinity and sufficient oxygen.Based on the integrative analysis of seismic data,log data and petrologic character,three types of sedimentary facies can be recognized in the Yijianfang Formation.They are platform shoal,intershoal,and patch reef.Based on this,the paleogeographic maps about the early Darriwilian Stage and late Darriwilian Stage are mapped,respectively.At last,the authors describe the depositional facies distribution in space.This is very important for people to engage oil and gas exploration in study area.
引文
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[2]俞仁连,傅恒.构造运动对塔河油田奥陶系碳酸盐岩的影响[J].天然气勘探与开发,2006,29(2):1-5.
[3]阎相宾.塔河油田下奥陶统古喀斯特作用及储层特征[J].江汉石油学院学报,2002,24(4):23-25.
[4]刘春燕,吴茂炳,巩固.塔里木盆地北部塔河油田奥陶系加里东期喀斯特作用及其油气地质意义[J].地质通报,2006,25(9-10):1128-1134.
[5]李国政,王辉,丁勇.塔河油田奥陶系碳酸盐岩油气藏石油地质条件[J].新疆石油地质,2002,23(6):493-495.
[6]刘文,李永宏,张涛,等.塔河油田奥陶系碳酸盐岩沉积相及地层学研究[J].石油实验地质,2002,24(2):104-109.
[7]刘存革,李国蓉,吴勇.新疆塔河油田下奥陶统碳酸盐岩储层成因类型与评价[J].沉积与特提斯地质,2004,24(1):91-96.
[8]林忠民.塔河油田奥陶系碳酸盐岩储层特征及成藏条件[J].石油学报,2002,23(3):23-27.
[9]陈强路,钱一雄,马红强,等.塔里木盆地塔河油田奥陶系碳酸盐岩成岩作用与孔隙演化[J].石油实验地质,2003,25(6):729-734.
[10]许效松,汪正江,万方,等.塔里木盆地早古生代构造古地理演化与烃源岩[J].地学前缘,2005,12(3):49-57.
[11]侯明才,万梨,傅恒,等.塔河南盐下地区上奥陶统良里塔格组沉积环境分析[J].成都理工大学学报(自然科学版),2006,33(5):509-515.
[12]许效松,刘宝珺,牟传龙,等.中国中西部海相盆地分析与油气资源[M].北京:地质出版社,2004.
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