云南富源一带晚二叠世层序地层与聚煤作用分析
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摘要
结合野外地质调查等工作,运用沉积学、层序地层学及煤田地质学的基本理论和方法,共识别包括区域不整合面、河流下切谷等4个层序界面,将云南富源一带晚二叠世含煤岩系—宣威组划分为3个三级层序。云南富源一带晚二叠世成煤过程中,在河流冲积平原靠陆一侧,在最大海泛面附近,泥炭堆积速率和海平面上升速率持平,沉积环境的相对稳定和沉积时间的持续累积,形成厚煤层。海侵体系域成煤最好,高位体系域也是煤层形成期,低位体系域最不利于成煤。
Using data from cores and outcrops combined with field geological survey,the basic theories and methods of sedimentology,sequence stratigraphy and coalfield geology are employed to identify a total of 4 sequence boundaries which are characterized by incised valley filled coarse-grained sandstone at disconformities.These sequence boundaries divide the Late Permian coal measures-Xuanwei Formation in Fuyuan area,Yunnan province,into 3 third-order sequences.During the course of the coal seam accumulation in the Late Permian in Fuyuan area,near the land part of the meandering alluvial plain and the maximum flooding surface,where the peat accumulation rates are almost the same as the accommodation creation rates resulting from the rise of sea level,a stable sedimentary condition and long-time deposit are maintained and thick coal seams are formed.The thick coal seams tended to accumulate at the Transgressive System Tract,the coal seams could also be formed at the High System Tract,whereas,the sedimentary environments are difficult for coal accumulation at the Lowe System Tract.
Using data from cores and outcrops combined with field geological survey,the basic theories and methods of sedimentology,sequence stratigraphy and coalfield geology are employed to identify a total of 4 sequence boundaries which are characterized by incised valley filled coarse-grained sandstone at disconformities.These sequence boundaries divide the Late Permian coal measures-Xuanwei Formation in Fuyuan area,Yunnan province,into 3 third-order sequences.During the course of the coal seam accumulation in the Late Permian in Fuyuan area,near the land part of the meandering alluvial plain and the maximum flooding surface,where the peat accumulation rates are almost the same as the accommodation creation rates resulting from the rise of sea level,a stable sedimentary condition and long-time deposit are maintained and thick coal seams are formed.The thick coal seams tended to accumulate at the Transgressive System Tract,the coal seams could also be formed at the High System Tract,whereas,the sedimentary environments are difficult for coal accumulation at the Lowe System Tract.
引文
[1]Van W J C,Mitchum R M,Campion K M,eta1.Siliciclastic sequence stratigraphy in well,core andoutcrops:concept for high resolution correlation ofti mes and facies[J].AAPG Methods in ExplorationSeries.1990(7)
[2]Vail P R,Andermard F,Bowan S A,et a1.The strati-graphic signatures of tectonics,eustasy and sedi mentolo-gy:an overview[A].In:Einsele G,Ricken W,Seila-cher A,eds.Cycles and Events in Stratigraphy[C].Berlin,Heidelberg:Springer Verlag.1991
[3]朱筱敏.层序地层学[M].山东东营:石油大学出版社,2000
[4]王训练.露头层序地层学研究中定义和识别不同级别沉积层序的标准[J].中国科学(D缉),2003(11)
[5]Bohacs K,Suter J,et al.Sequence stratigraphic distri-bution of coaly rocks:fundamental controls and paralicexamples[J].AAPG Bulletin,1997.81
[6]邵龙义,张鹏飞.含煤岩系层序地层模式[J].长春科技大学学报(专辑),1998
[7]邵龙义,窦建伟,张鹏飞.含煤岩系沉积学和层序地层学研究现状与展望[J].煤田地质与勘探,1998(1)
[8]王小川.黔西川南滇东晚二叠世含煤地层沉积环境与聚煤规律[M].重庆:重庆大学出版社,1996
[9]桂宝林,王朝栋.滇东黔西地区煤层气构造特征[J].云南地质,2000(4)
[10]魏魁生,徐怀大.非海相层序地层学——以松辽盆地为例[M].北京:地质出版社,1996
[11]冯有良,周海民,李思田等.陆相断陷盆地层序类型与构造特征[J].地质论评,2004(1)
[12]林畅松,刘景彦,张英志等.构造活动盆地的层序地层与构造地层分析——以中国中、新生代构造活动湖盆分析为例[J].地学前缘,2005(4)
[13]Aitken J F.Coal in a sequence stratigraphic framework[J].Geoscientist,1994,4(5)
[14]邵龙义,陈家良,李瑞军等.广西合山晚二叠世碳酸盐岩型煤系层序地层分析[J].沉积学报,2003(1)
[2]Vail P R,Andermard F,Bowan S A,et a1.The strati-graphic signatures of tectonics,eustasy and sedi mentolo-gy:an overview[A].In:Einsele G,Ricken W,Seila-cher A,eds.Cycles and Events in Stratigraphy[C].Berlin,Heidelberg:Springer Verlag.1991
[3]朱筱敏.层序地层学[M].山东东营:石油大学出版社,2000
[4]王训练.露头层序地层学研究中定义和识别不同级别沉积层序的标准[J].中国科学(D缉),2003(11)
[5]Bohacs K,Suter J,et al.Sequence stratigraphic distri-bution of coaly rocks:fundamental controls and paralicexamples[J].AAPG Bulletin,1997.81
[6]邵龙义,张鹏飞.含煤岩系层序地层模式[J].长春科技大学学报(专辑),1998
[7]邵龙义,窦建伟,张鹏飞.含煤岩系沉积学和层序地层学研究现状与展望[J].煤田地质与勘探,1998(1)
[8]王小川.黔西川南滇东晚二叠世含煤地层沉积环境与聚煤规律[M].重庆:重庆大学出版社,1996
[9]桂宝林,王朝栋.滇东黔西地区煤层气构造特征[J].云南地质,2000(4)
[10]魏魁生,徐怀大.非海相层序地层学——以松辽盆地为例[M].北京:地质出版社,1996
[11]冯有良,周海民,李思田等.陆相断陷盆地层序类型与构造特征[J].地质论评,2004(1)
[12]林畅松,刘景彦,张英志等.构造活动盆地的层序地层与构造地层分析——以中国中、新生代构造活动湖盆分析为例[J].地学前缘,2005(4)
[13]Aitken J F.Coal in a sequence stratigraphic framework[J].Geoscientist,1994,4(5)
[14]邵龙义,陈家良,李瑞军等.广西合山晚二叠世碳酸盐岩型煤系层序地层分析[J].沉积学报,2003(1)
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