内蒙古二连盆地巴彦宝力格煤田下白垩统赛汉塔拉组层序&#x02014;古地理与聚煤作用<sup>&#x0002A;</sup>

doi:10.7605/gdlxb.2018.02.024

古地理学报 ›› 2018, Vol. 20 ›› Issue (2): 325-336. doi: 10.7605/gdlxb.2018.02.024

内蒙古二连盆地巴彦宝力格煤田下白垩统赛汉塔拉组层序—古地理与聚煤作用^*

王帅¹, 邵龙义¹, 孙钦平², 张云鹤¹, 史鸣剑¹, 孙斌², 鲁静¹

1 中国矿业大学(北京)地球科学与测绘工程学院,北京 100083;
2 中国石油勘探开发研究院廊坊分院,河北廊坊 065007

收稿日期:2017-05-03 修回日期:2017-08-11 出版日期:2018-04-01 发布日期:2018-04-02
通讯作者: 邵龙义,男,1964年生,中国矿业大学(北京)教授,博士生导师,主要从事中国含煤、含油盆地沉积学和层序地层学研究。E-mail: ShaoL@cumtb.edu.cn。
作者简介:王帅,男,1989年生,中国矿业大学(北京)博士研究生,主要从事煤田地质学和层序地层学研究。E-mail: 1015351960@qq.com。
基金资助:
*国家科技重大专项(编号: 2016ZX05041004-003)资助

Sequence-palaeogeography and coal accumulation of the Lower Cretaceous Saihantala Formation in the Bayanbaolige Coalfield, Erlian Basin, Inner Mongolia

Wang Shuai¹, Shao Long-Yi¹, Sun Qin-Ping², Zhang Yun-He¹, Shi Ming-Jian¹, Sun Bin², Lu Jing¹

1 School of Geoscience and Surveying Engineering,China University of Mining & Technology(Beijing),Beijing 100083;
2 Langfang Branch of Research Institute of Petroleum Exploration and Development,PetroChina,Langfang 065007,Hebei;

Received:2017-05-03 Revised:2017-08-11 Online:2018-04-01 Published:2018-04-02
Contact: Shao Long-Yi,born in 1964,is a professor of School of Geoscience and Surveying Engineering of China University of Mining & Technology(Beijing). He is currently engaged in sedimentary and sequence stratigraphy of coal and oil basins in China. E-mail: ShaoL@cumtb.edu.cn.
About author:Wang Shuai,born in 1989,is a Ph.D. candidate of China University of Mining & Technology(Beijing),and is mainly engaged in sedimentary and sequence stratigraphy. E-mail: 1015351960@qq.com.About the corresponding author Shao Long-Yi,born in 1964,is a professor of School of Geoscience and Surveying Engineering of China University of Mining & Technology(Beijing). He is currently engaged in sedimentary and sequence stratigraphy of coal and oil basins in China. E-mail: ShaoL@cumtb.edu.cn.
Supported by:
[Funded by the National Science and Technology Major Project of China(No.2016ZX05041004-003)]

摘要/Abstract

摘要： 二连盆地巴彦宝力格煤田蕴藏着丰富的煤炭和煤层气资源。利用钻孔和测井资料对赛汉塔拉组层序格架下的古地理演化特征和聚煤作用进行研究,识别出3种层序界面类型: 区域不整合面、河道下切谷冲刷面和对应整合面,将赛汉塔拉组划分为2个三级层序,厚煤层主要发育于层序Ⅰ湖侵体系域早期和晚期。采用单因素分析多因素综合作图法,恢复了层序格架下的古地理格局,古地理单元为冲积扇、扇三角洲平原和滨浅湖。有利聚煤环境为扇三角洲平原与滨浅湖过渡带、滨浅湖,具有合适的基底沉降速率并且受到较小的陆源碎屑影响。从层序Ⅰ到层序Ⅱ,煤层厚度减小,聚煤作用减弱;多层厚煤层的形成受基底沉降震荡性、周期性的影响,受可容空间增加速率与泥炭堆积速率比值不断变化的控制。层序Ⅰ发育时期,研究区中部为下一步煤炭资源和煤层气勘探的有利区。

关键词: 二连盆地, 断陷盆地, 下白垩统, 层序—, 古地理, 聚煤作用

Abstract: The Bayanbaolige Coalfield of Erlian Basin is rich in coal and coalbed methane resources. In this paper, we studied the palaeogeographic evolution and coal accumulation in sequence stratigraphic framework of the Lower Cretaceous Saihantala Formation based on data of boreholes and logging curves. Three types of sequence boundary, including regional unconformities, basal erosional surfaces of the incised valley fills and correlative conformities, were recognized. Accordingly, the Saihantala Formation was divided into two third-order sequences, and thick coal seams were developed in the early and late transgressive system tract of Sequence Ⅰ. The palaeogeographic pattern were reconstructed based on the single factor analysis and multifactor comprehensive mapping method, and the palaeogeographic units include alluvial fan, fan delta plain and shoreline-shallow lake. The favorable coal-forming sites were in the lakeshore-shallow lake, the transitional zone between fan delta plain and lakeshore-shallow lake where moderate subsidence was maintained and there was little input of coarse-grained sediments. Seam thickness and coal accumulation decreased from Sequence Ⅰ to Sequence Ⅱ. The development of the thick coal seams of multilayers, which were affected by intermittence and periodicity of subsidence, were controlled by the continuous change of ratio between the accommodation increase rate and the peat accumulation rate. For the Sequence Ⅰ,the central study area is the favorable area for the exploration of coal and coalbed methane resources in the future.

Key words: Erlian Basin, faulting basin, Lower Cretaceous, sequence-palaeogeography, coal accumulation

中图分类号:

P531

王帅, 邵龙义, 孙钦平, 张云鹤, 史鸣剑, 孙斌, 鲁静. 内蒙古二连盆地巴彦宝力格煤田下白垩统赛汉塔拉组层序—古地理与聚煤作用^*[J]. 古地理学报, 2018, 20(2): 325-336.

Wang Shuai, Shao Long-Yi, Sun Qin-Ping, Zhang Yun-He, Shi Ming-Jian, Sun Bin, Lu Jing. Sequence-palaeogeography and coal accumulation of the Lower Cretaceous Saihantala Formation in the Bayanbaolige Coalfield, Erlian Basin, Inner Mongolia[J]. JOPC, 2018, 20(2): 325-336.

http://www.gdlxb.cn/CN/Y2018/V20/I2/325

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内蒙古二连盆地巴彦宝力格煤田下白垩统赛汉塔拉组层序—古地理与聚煤作用^*

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