Microsoft Word - 1 郭东鑫_new_.doc

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1 第 39 卷第 6 期煤田地质与勘探 Vol. 39 No 年 12 月 COAL GEOLOGY & EXPLORATION Dec 文章编号 : (2011) 内蒙古乌尼特煤田含煤地层层序划分与聚煤规律郭东鑫, 唐书恒, 郑贵强, 张静平, 李忠城 ( 中国地质大学能源学院, 北京 ) : 通过对乌尼特煤田白垩系下统巴彦花组含煤地层的研究, 识别出两个层序界面 SB1 和 SB2, 划分出 SMC1 SMC2 和 SMC3 共 3 个三级层序, 建立了巴彦花组层序地层格架在地层中, 识别出浅湖滨湖三角洲和河流相等沉积相类型, 其中滨湖相和河流三角洲相是本区煤层的主要沉积环境根据钻井岩心资料煤层厚度分布砂泥比和层序地层格架展布, 编制了岩相古地理图研究成果对该区的煤炭资源勘探开发有指导意义 : 乌尼特煤田 ; 层序 ; 沉积相 ; 聚煤规律 :P618.11; P539.2 :A DOI: /j.issn Sequence strata and the coal accumulation of Wunite coafield, Inner Mongolia GUO Dongxin, TANG Shuheng, ZHENG Guiqiang, ZHANG Jingping, LI Zhongcheng (School of Energy Resource, China University of Geosciences, Beijing , China) Abstract: Based on the study of the stratigraphy sequence of the Bayanhua Formation of low Cretaceous in Wunite coafield, two sequence boundaries SB1 and SB2 were distinguished, three third sequences including SMC1, SMC2 and SMC3 were divided, and the stratigraphy framework of the Bayanhua Formation was established. The facies analysis shows that the strata were developed from lacustrine facies, delta facies and fluvial facies deposition. And lake offshore facies and river delta facies were the predominant paleoenvironment for coal formation. Finally, according to the core data, thickness of the coal layer, the proportion of sand and mud in the strata and the distribution of the stratigraphy sequence, the lithofacies paleographic map was made, which will provide a helpful guidance to the exploration and development of the coal around the area. Key words: Wunite coafield; sequence; sedimentary facies; coal accumulation t [1-3] 1 煤田地质概况 1.1 ( ) ( ) ( ) ( ) NNE ( 1) (C) (P 1 g) (K 1 b) (N 2 ) (Q 2 ) 1.2 收稿日期 : 基金项目 : (973 ) (2009CB219604) 作者简介 : (1984 ).

2 煤田地质与勘探第 39 卷 1 Fig. 1 The tectonic location of Wunite coalfield (R o max) 0.296%~0.343% 46.0%~91.40% 72.89% 3.3%~25.90% 10.32% 182.

1 6-4 ( 2) SB2 SB1 SB1 SB2 6-4 MSC1 MSC2 MSC3 3 [4-7] MSC1 3 MSC2 1 MSC3 10 5 5 B8 B8 B8 B3 B4 3 3 3 3 2.

2 2 煤田地质与勘探第 39 卷 1 Fig. 1 The tectonic location of Wunite coalfield (R o max) 0.296%~0.343% 46.0%~91.40% 72.89% 3.3%~25.90% 10.32% ~ m m m m 7.6% 5.7% A B 13 (A2 A3 A4 A6 B1 B3 B4 B6 B8 B9 B10 B11 B12 ) 7 (B1 B3 B4 B7 B8 B9 B10) 2 层序地层分析 ( 2) SB2 SB1 SB1 SB2 6-4 MSC1 MSC2 MSC3 3 [4-7] MSC1 3 MSC2 1 MSC B8 B8 B8 B3 B [8-11] NE-SW ( 3) SB1 SB2 MSC1 MSC2 MSC3 3 SMC1 SMC2 MSC3 B1 B3 B B8 B7 B B B7 B8 B9 B10 B11 A2-B6 3 沉积相及煤层聚集规律 3.1

3 第 6 期郭东鑫等 : 内蒙古乌尼特煤田含煤地层层序划分与聚煤规律 3 a. 河流相 B8 ( 2) b. 三角洲平原相 Fig The sequence framework and sedimentary facies of the Bayanhua Formation, 6-4 well,wunite coalfield

4 4 第 39 卷煤田地质与勘探图3 Fig. 3 乌尼特地区 NE-SW 向连井剖面图 The profile map of wells on northeast to southwest direction 部发育有明显的三角洲平原分流河道相的沉积通过对乌尼特煤田单井分析连井分析及各沉分选较好的粗砂岩向上逐渐变细直到顶部出现河泛积相的测井响应曲线的研究并结合砂泥比图煤层沉积形成了薄煤层与泥质河泛沉积物互层河流厚度图建立了乌尼特地区沉积相平面展布图(图 4) 二元结构明显电阻率曲线和自然伽马曲线显示中 3.3 高幅震荡钟形(图 2) c. 滨湖相滨湖沉积物一般分选较好主要由煤层聚集规律分析表明 B7-B11 煤层主要形成于滨湖沼泽环境 B6-A2 煤层形成时期三角洲发育现以 B8 煤分砾岩砂岩泥岩和煤层组成由于滨湖周期性暴露水进水退频繁因此泥炭沼泽极为发育是成煤的重要环境滨浅湖水体动荡的特点使得煤层与砂泥层呈互层出现在测井曲线上表现为低幅度背景或呈中高幅度指状峰形 [12-16] (图 2) 3.2 含煤段沉积相演化特征该区从巴彦花组下部沉积开始水体逐渐由半深湖变浅在含煤段下部东北方向有小规模物源进入形成湖泊三角洲但砂泥比值反映其规模较小只控制了盆地北部地区砂体分布随后水体继续下降滨湖大片出露形成泥炭沼泽环境该区西北方向为主要的物源方向此处形成了一个较大的砂岩分布区域砂体厚度向外逐渐减少总体砂泥比值大于 0.5 且砂泥比值中间较大形成了朵叶状平面展布结构分析认为这是河流向湖泊进积过程中形成的三角洲相图4 Fig. 4 乌尼特地区含煤段沉积相平面展布示意图 The sketch map of the sedimentary facies distribution on the coal bearing section in Wunite area

5 第 6 期郭东鑫等 : 内蒙古乌尼特煤田含煤地层层序划分与聚煤规律 5 B8 ( 5) B8 B8 16 m 34 m 6 m B8 NE-SW b. c. B7-B11 A2-B6 参考文献 [1] [J] (2) [2] [J] (6) 1 5 [3] [J] (1) 9 11 [4] [M] [5] C. K. [M] [6] HAUGHTON D W MORTON A C TODD S P Developments in sedimentary provenance studies[m] London Oxford University Press 1991 [7] [J] (4) [8] [M] 1996 [9] [M] 2005 [10] [J] (5) [11] [D] 2008 [12] [J] (3) [13] [J] ( ) (2) [14] WYLLIE M R J GREGORY A R GARDNER L W Elastic 5 B8 Fig. 5 The coal thickness isoline map of B8 coal in Wunite area 4 结论 a. SB1 SB2 MSC1 MSC2 MSC3 3 wave velocities in heterogeneous and porous media[j]. Geophysics [15] MAGARA K CHRISTOPHER A S MICHAEL J S. Processes of sedimentation on a lacustrine borderfault margin, interpretation of cores from lake malawi east Africa[J] Journal of Sedimentary Research (4) [16] [J] (5)

Microsoft Word - 05-柳磊.doc

Microsoft Word - 05-柳磊.doc 2011 9 Sep. 2011 32 5 : 549-558 Acta Geoscientica Sinica Vol.32 No.5: 549-558 www.cagsbulletin.com www. 地球学报.com,,,,, 830047 摘要 :,,, SQ1 SQ2, 6 SQ1,,,,, ; SQ2,, 关键词 : ; ; ; 中图分类号 : P618.11; P612 文献标志码