塔河南盐下地区上奥陶统良里塔格组沉积环境分析
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摘要
塔河南盐下地区上奥陶统良里塔格组主要为一套碳酸盐岩。通过对研究区28口钻井岩心的详细描述和3 200余块薄片的鉴定,确认其主要的岩石类型有微晶灰岩、生屑灰岩、藻粘结灰岩、藻球粒灰岩、鲕粒灰岩、含玄武岩屑灰岩。在这些碳酸盐岩中可见藻屑、苔藓虫屑、角石、海绵、棘屑、腕足、双壳、珊瑚、三叶虫等指示正常海相环境的生物。在综合分析其岩石学特征、自然伽马曲线、成像测井和地震资料的基础上,将研究区良里塔格组划分为开阔台地、台地边缘浅滩和台地前缘斜坡三种沉积环境。并讨论了良里塔格早、晚期沉积相的空间展布特征,编制了各时期的古地理图。为塔河南上奥陶统的油气勘探提供了地质指导。
The Upper Ordovician Lianglitage Formation mainly consistes of carbonates in the south of Tarim River of Xinjiang.In this paper,twenty eight cores are observed in detail,three thousand and two hundred slices are identified,then the authors thought rock types were as follows: calcipulverite,biolclastic limestone,algal binstone,algal pelleted limestone,oolilts,contain basalt clastic limestone.Biology,such as algal,bryozoa,goniolithon,sponge,echinodermata,brachiopod,bivalve,coral,trilobite,which are conserved in the carbonate of the Lianglitage Formation,indicates a normal shallow marine environment.Based on the integrative analysis of the natural gamma-ray log,imagery log,seismic data and petrology character,three types of sedimentary environments can be recognized in the Lianglitage Formation.They are open platform,marginal platform shoal and platform frontier slope.Based on this,the paleogeographic maps are mapped about early Baota stage and late Baota stage,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 Upper Ordovician Lianglitage Formation mainly consistes of carbonates in the south of Tarim River of Xinjiang.In this paper,twenty eight cores are observed in detail,three thousand and two hundred slices are identified,then the authors thought rock types were as follows: calcipulverite,biolclastic limestone,algal binstone,algal pelleted limestone,oolilts,contain basalt clastic limestone.Biology,such as algal,bryozoa,goniolithon,sponge,echinodermata,brachiopod,bivalve,coral,trilobite,which are conserved in the carbonate of the Lianglitage Formation,indicates a normal shallow marine environment.Based on the integrative analysis of the natural gamma-ray log,imagery log,seismic data and petrology character,three types of sedimentary environments can be recognized in the Lianglitage Formation.They are open platform,marginal platform shoal and platform frontier slope.Based on this,the paleogeographic maps are mapped about early Baota stage and late Baota stage,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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[7]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.
[8]肖丽,范晓敏,梅忠武.塔河油田奥陶系地层成像测井模式探讨[J].测井技术,2005,29(2):125-128.
[9]闫相宾,韩振华,李永宏.塔河油田奥陶系油藏的储存特征和成因机理探讨[J].地质论评,2002,8(6):619-626.
[10]张军阳,颜修刚.塔河油田上奥陶统与中下奥陶统界线划分的依据和意义[J].西部探矿工程,2005,17(4):59-60.
[2]WILLSON J L.Carbonate Facies in Geologic History[M].Berlin Heidberg,New York:Springer-Verlag,1975.
[3]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.
[4]姜在兴.沉积学[M].北京:石油工业出版社,2003.
[5]康玉柱.塔里木盆地塔河大油田形成的地质条件及前景展望[J].中国地质,2003,30(3):315-319.
[6]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.
[7]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.
[8]肖丽,范晓敏,梅忠武.塔河油田奥陶系地层成像测井模式探讨[J].测井技术,2005,29(2):125-128.
[9]闫相宾,韩振华,李永宏.塔河油田奥陶系油藏的储存特征和成因机理探讨[J].地质论评,2002,8(6):619-626.
[10]张军阳,颜修刚.塔河油田上奥陶统与中下奥陶统界线划分的依据和意义[J].西部探矿工程,2005,17(4):59-60.
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