塔里木盆地孔雀河地区寒武系—下奥陶统沉积特征
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摘要
应用地震、测井和野外剖面对孔雀河地区寒武系—下奥陶统的沉积相进行了研究,识别出次深海相、浅海陆棚相、台地前缘斜坡相、生物礁、开阔台地相、局限台地相和台地蒸发岩相7种沉积相。这些沉积相可以划分为3个沉积区,分别是盆地沉积区、台地边缘沉积区和台地沉积区。在草湖、尉犁和铁干里克3个地区发育前台地边缘沉积区和台地沉积区的沉积相,3个地区之间发育有盆地沉积区的沉积相。台地蒸发岩相只发育于草湖地区的北部。生物礁在3个地区开阔台地向海和背海一侧都广泛发育,这些生物礁是油气聚集的有利场所。
Sedimentary facies of the Cambrian-Lower Ordovician sequence were studied by means of seismic,logging and outcrops.Seven facies were recognized,which are sub-abyss,shallow marine shelf,platform edge ramp,reef,open platform,restricted platform and platform evaporite facies.They can be grouped into three depositional environments,i.e.basinal,platform edge and platform.There are platform edge and platform deposits in Caohu,Weili and Tieganlike district,between which there are basinal deposits.Platform evaporite facies are located in the north of Caohu.Reef is widespread on the edge of the open platform both landward and seaward.This is favorable to petroleum accumulation.
Sedimentary facies of the Cambrian-Lower Ordovician sequence were studied by means of seismic,logging and outcrops.Seven facies were recognized,which are sub-abyss,shallow marine shelf,platform edge ramp,reef,open platform,restricted platform and platform evaporite facies.They can be grouped into three depositional environments,i.e.basinal,platform edge and platform.There are platform edge and platform deposits in Caohu,Weili and Tieganlike district,between which there are basinal deposits.Platform evaporite facies are located in the north of Caohu.Reef is widespread on the edge of the open platform both landward and seaward.This is favorable to petroleum accumulation.
引文
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[6]梅冥相,马永生,周丕康,等.碳酸盐沉积学导论[M].北京:地质出版社,1997:1-306.MEI Ming-xiang,MA Yong-sheng,ZHOU Pei-kang,et al.The introduction of carbonate sedi mentology[M].Beijing:Geological Publishing House,1997:1-306.
[7]Reading H G.Sedi mentary environments:processes,facies,stratigraphy[M].3rd ed.United Kingdom:Blackwell Scientific Publications,1996.
[8]Tucker M E.Sedi mentary petrology[M].2nd ed.Great Britain:Blackwell Scientific Publications,1991.
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[10]Schlager W,Ginsburg R N.Bahama carbonate pla-tforms—the deep and the past[J].MarineGeo,1981,144:1-24.
[11]Riding R.Structure and composition of organic reefs and carbonate mud mounds:concepts and categories[J].Earth-Science Reviews,2002,58(1/2):163-231.
[12]邬光辉,黄广建,王振宇,等.塔中奥陶系生物礁地震识别与预测[J].天然气工业,2007,27(4):40-42.WU Guang-hui,HUANG Guang-jian,WANG Zhen-yu,et al.The seismic identification and prediction of the reef in the Ordovician of the Central Tari m basin[J].Natural Gas Industry,2007,27(4):40-42.
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