甘蒙地区北山盆地群含煤系地层时代归属

牛海青; 韩小锋; 吴俊; 王宝文; 许海红; 宋博; 许伟

doi:10.19509/j.cnki.dzkq.2021.0621

甘蒙地区北山盆地群含煤系地层时代归属

doi: 10.19509/j.cnki.dzkq.2021.0621

牛海青^1,,
韩小锋²,
吴俊^3, ,,
王宝文²,
许海红²,
宋博²,
许伟²

基金项目:

国家自然科学基金项目 41472004

中国地质调查局项目"银额盆地西部-北山盆地群油气地质调查" DD20190092

咸阳职业技术学院博士科研基金项目 2019BK002

详细信息

作者简介:
牛海青(1982-), 女, 讲师, 主要从事能源地质调查工作。E-mail: upc_nhq@163.com

通讯作者:
吴俊(1983-), 男, 高级工程师, 主要从事区域地质调查和地层古生物研究工作。E-mail: 258155816@qq.com

中图分类号: P536
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- 文章访问数: 488
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- 被引次数: 0
出版历程
- 收稿日期: 2020-09-27

Age attribution of coal bearing strata in Beishan Basin Group, Ganmeng area

摘要

摘要: 甘蒙地区北山盆地群发育大量煤系地层，但由于构造演化期次复杂，地震、钻井及相关的古生物资料缺乏，导致煤系地层的时代归属一直存在争议，资源潜力尚未明确。为了明确北山盆地群含煤系地层的时代归属，进一步确定资源潜力，为研究区的能源资源勘探提供基础资料，在系统总结前人研究成果的基础上，以古生物年代学为抓手，以北山盆地群黑鹰山盆地、公婆泉盆地及中口子盆地煤系地层中丰富的孢粉、古生物资料为主要依据，结合煤系地层的岩石组合特征、煤岩工业特性、地震资料等证据对北山盆地群煤系地层时代归属进行了整体研究，重新厘定了北山盆地群煤系地层的时代归属。认为北山盆地群中各个盆地均发育了一套含煤层系，但这套含煤层系的时代归属并不相同，有的属侏罗纪、有的属白垩纪。仅北山盆地群最南部的中口子盆地南部区域以及盆地群最北部的黑鹰山盆地东部的含煤岩系为侏罗系，其他次级盆地的含煤岩系均属于白垩系。盆地群南部中口子盆地含煤岩系的归属问题呈现出和构造相一致的"南北差异"，南缘出露煤系地层时代为中侏罗世，北部煤系地层时代为白垩纪。含煤层系归属问题的厘定为进一步确定盆地区的资源潜力提供了依据，可为北山盆地群含煤层系的原型盆地恢复及构造演化等研究提供参考。
- 时代归属 /
- 煤系地层 /
- 孢粉 /
- 侏罗纪 /
- 北山盆地群
Abstract: A large number of coal bearing strata are developed in Beishan Basin Group of Ganmeng area.However, due to the complexity of tectonic evolution, lack of seismic, drilling and related paleontological data, the age of coal bearing strata has been controversial, and the potential of resources is not clear.On the basis of summarizing the previous research results, taking paleontology chronology as the starting point, combining the characteristics of rock assemblage, coal industrial characteristics, seismic data, outcrop data and other evidence, the age attribution of coal bearing strata in Beishan Basin Group is studied.According to the analysis of sporopollen paleontology, coal petrology industrial characteristics and stratigraphic contact relationship, it is considered that each basin of Beishan Basin Group has developed a set of coal bearing series, but the age of this coal bearing system is not the same.Some are Jurassic and some are Cretaceous, but the possibility of Triassic or Permian is ruled out.Only the coal bearing strata in the southern part of Zhongkouzi Basin in the southernmost part of Beishan Basin Group and the eastern part of Heiyingshan Basin in the northernmost part of the basins group are Jurassic, and the coal bearing rock series of other sub basins belong to Cretaceous.The coal bearing strata in Zhongkouzi Basin in the southern part of the basins group show a "North-South difference" consistent with the structure features.The age of the exposed coal bearing strata in the south is Middle Jurassic, and that in the north is Cretaceous.The classification of the coal bearing series provides a basis for further determining the resource potential of Beishan Basin Group, and provides a reference for the study of the prototype basin restoration and tectonic evolution of the coal bearing series in the Beishan Basin Group.
- age attribution /
- coal bearing strata /
- sporopollen /
- Jurassic /
- Beishan Basin Group

HTML全文

图 1 北山盆地群煤系地层时代认识及位置统计示意图

1.省界；2.研究范围；3.盆地；4.断裂；5.地震测线；6.地名；7.露头剖面；8.露头采样点；9.钻井采样点

Figure 1. Statistical diagram of age recognition and position of coal bearing strata in Beishan Basin Group

下载: 全尺寸图片幻灯片

图 2 ZK01-2钻孔孢粉化石鉴定图版

1.紧接蝶囊粉Platysaccus proximus(Bolkhovitina)Song, 2000; 2~7.黄色皱球粉Psophosphaera flavus(Leschik)Qian, 1983; 8.稀饰三角块瘤孢Converrucosisporites dilutus Pu&Wu, 1985; 9, 10, 12, 14, 15.威氏紫其孢Osmundacidites wellmanii Couper, 1953; 11.小刺毛孢Pilosisporites parvus(Ivanova) Pu & Wu, 1982; 13.粒面紫萁孢Osmundacidites granulata Zhou, 1981; 16, 19, 21.相等角刺孢Ceratospories equalis Cookson & Dettmann, 1958; 17, 18.大型罗汉松粉Podocarpidies major (Bolkhovitina) Chlonova, 1976; 20.收缩瓦尔茨Waltzispora strictura Ouyang & Li, 1980; 22, 24, 26, 28, 30.开放拟云杉粉Piceites expositus Bolkhovitina, 1956; 23.小脊尼德粉Nidipollenites lirellatus Wang, 1985; 25.黄色原始松柏粉Protoconijferus flavus Bolkhovitina, 1956; 27.圆体单脊粉Chordasporites orbicorpus Zhou, 1980; 29.椭圆瓦氏粉Walikalesaccites ellipticus Bose& Kar, 1966

Figure 2. Identification chart of drilling pollen fossil ZK01-2

下载: 全尺寸图片幻灯片

图 3 ZK01-3钻孔孢粉化石鉴定图版

1.小脊尼德粉Nidipollenies lrellthes Wang, 1985; 2, 3, 10, 14, 15.开放拟云杉粉Piceites expositus Bolkhovitina, 1956; 4.较小广口粉Chasmatosporites minor Nilsson, 1958; 5, 9.南方拟棒石松孢Lycopodiumsporites austroclavatidites(Cookson)Potonié, 1956; 6.多变假云杉粉Pseudopicea variabiliformis (Mal.)Bolkhovitina，1956; 7.圆形阿里粉Alisporites rotundus Rouse，1959; 8.相等角刺孢Ceratosporites equalis Cookson & Dettmann，1958; 11, 18, 24.威氏紫萁孢Osmundacidites wellmanii Couper，1953; 12.真边四字粉Quadraeculina limbata Maljavkina, 1949; 13.中等苏铁粉Cycadopites medius(Bolkhovitina) Xu & Zhang, 1980; 16.厚垣罗汉松粉Podocarpidites paulus(Bolkhovitina)Xu & Zhang, 1980; 17.绕转阿赛勒特孢Asseretospora gryata(Playford & Dettmann)Schuurman, 1977; 19, 22.金黄蝶囊粉Platysaccus luteus(Bolkhovitina)Li & Shang, 1980; 20, 25.多分罗汉松粉Podocarpidites multicinus(Bolkhovitina)Pocock, 1970; 21.单色原始罗汉松粉Protopodocarpus monochromatus Bolkhovitina, 1956; 23, 26, 27.粒面紫萁孢Osmundacidites granulata Zhou, 1981

Figure 3. Identification chart of drilling pollen fossil ZK01-3

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图 4 北山盆地群煤系地层主要孢粉类型组合特征对比图

Figure 4. Correlation of assemblage characteristics of main types of pollen in coal strata of Beishan Basin Group

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图 5 中口子盆地侏罗系-白垩系接触关系地震剖面图

Figure 5. Seismic profile of the contact relationship between Jurassic and Cretaceous in Zhongkouzi Basin

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表 1 北山盆地群煤岩工业性能参数统计

Table 1. Statistics of industrial performance parameters of coal and rock in Beishan Basin Group

煤样位置	地层时代	灰分A.d	硫分St.d	发热量Qgr.ad/(MJ·kg^-1)	挥发分水分V_daf/%
煤样位置	地层时代	φ_B/%		发热量Qgr.ad/(MJ·kg^-1)	挥发分水分V_daf/%
公婆泉	白垩系	15~40	0.3~3.0	16~30	41~45
希热哈达	侏罗系	5.48~54.26	0.22~5.78	10.60~31.46	28.95~52.34
小青山	侏罗系	24.09~30.07	0.41~2.49	17.35~20.61	31.73~31.83
红柳大泉^[28]	白垩系	6.91~32.28	0.38~1.33	19.1~29.13	34.09~46.82

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