新疆准东煤田东部层序地层学及聚煤规律研究
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摘要
首次以准东煤田东部煤矿勘查区为主要研究对象,以钻井岩心描述资料、地震和测井资料为基础,运用层序地层学、煤田地质学和沉积学等相关理论和技术方法,建立了准东煤田东部层序地层格架,重点研究了中侏罗统西山窑组层序地层特征,探讨了聚煤作用和聚煤规律.研究区内侏罗系可划分为两个二级层序和6个三级层序,西山窑组可划分为一个完整的三级层序,6个准层序组(4级)和19个准层序(5级).层序地层研究表明,西山窑组可采煤层主要发育于湖扩体系域(TST)末期和高位体系域(HST)早期,该时期较快的可容纳空间增加速率和较快的泥碳堆积速率间相平衡,有利于厚煤层的聚集.
It is the first time to study the east of zhundong coal field.Based on the information from the drilling cores,well logs and sesmic cross sections,applying the theories and methods of sequence stratigraphy,coal geology and sedimentology,the sequence stratigraphic framwork,depositional systems and coal facies of Xishanyao Formation in the Zhundong coal field are analysed.On the Basis of the conprehensive analysis above,the sequence stratigraphic framework of Xishanyao Formation is established,the types and evolution of depositional systems are discussed in detailed;Finally,the controlling factors of coal-accumulation and the distribution of thick coal seams are analysed.The Jurassic strata can be divided into two second-order sequences and six third-order sequences.The objective interval Xishanyao Formation is a complete third-order sequence,and can be divided into six Parasequence sets(forth-order) and nineteen Parasequence(fifth-order).By sequence stratigraphic analysis,coal seams with great significance in Xishanyao Formation were formed at the late lake expansion systems tract(EST)and the early highstand system tract(HST),when the rate in creation of accommodation kept balance with peat accumulation rate.
It is the first time to study the east of zhundong coal field.Based on the information from the drilling cores,well logs and sesmic cross sections,applying the theories and methods of sequence stratigraphy,coal geology and sedimentology,the sequence stratigraphic framwork,depositional systems and coal facies of Xishanyao Formation in the Zhundong coal field are analysed.On the Basis of the conprehensive analysis above,the sequence stratigraphic framework of Xishanyao Formation is established,the types and evolution of depositional systems are discussed in detailed;Finally,the controlling factors of coal-accumulation and the distribution of thick coal seams are analysed.The Jurassic strata can be divided into two second-order sequences and six third-order sequences.The objective interval Xishanyao Formation is a complete third-order sequence,and can be divided into six Parasequence sets(forth-order) and nineteen Parasequence(fifth-order).By sequence stratigraphic analysis,coal seams with great significance in Xishanyao Formation were formed at the late lake expansion systems tract(EST)and the early highstand system tract(HST),when the rate in creation of accommodation kept balance with peat accumulation rate.
引文
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[2]张满郎,张琴,朱筱敏.准噶尔盆地侏罗系层序地层划分探讨[J].石油实验地质,2000,22(3):236-240.
[3]王宜林,王英民,齐雪峰,等.准噶尔盆地侏罗系层序地层划分[J].新疆石油地质,2001,22(5):382-386.
[4]柳永清,李寅.准噶尔盆地侏罗系露头层序地层及沉积学特征[J].地球学报,2001,22(1):49-54.
[5]张冬玲,鲍志东,杨文秀.准噶尔盆地侏罗系层序地层格建立及主控因素分析[J],大庆石油学院学报,2005,29(2):10-12.
[6]鲍志东,管守锐,李儒峰,等.准噶尔盆地侏罗系层序地层学研究[J].石油勘探与开发,2002,29(1):48-51.
[7]刘海涛,卫延召,张光亚,等.准噶尔盆地白家海地区侏罗系聚煤作用与层序地层[J].天然气地球科学,2006,17(6):802-806.
[8]刘豪,王英民.浅析准噶尔盆地侏罗系煤层在层序地层中的意义[J].沉积学报,2002,20(2):197-202.
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