Age attribution of coal bearing strata in Beishan Basin Group, Ganmeng area
-
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。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.
-
Key words:
- age attribution /
- coal bearing strata /
- sporopollen /
- Jurassic /
- Beishan Basin Group
-
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
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
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Vdaf/% φB/% 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 -
[1] 王洁, 赵雪晶, 王彦军. 吐哈盆地聚煤构造研究[J]. 新疆地质, 2014, 32(2): 266-270. https://www.cnki.com.cn/Article/CJFDTOTAL-XJDI201402026.htmWang J, Zhao X J, Wang Y J. Study on coal-accumulating structure of Turpan-Hami Basin[J]. Xinjiang Geology, 2014, 32(2): 266-270(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-XJDI201402026.htm [2] 何静, 黄涛, 冯烁, 等. 三塘湖煤田西山窑组煤地球化学特征及沉积环境意义[J]. 煤炭科学技术, 2020, 48(5): 173-181. https://www.cnki.com.cn/Article/CJFDTOTAL-MTKJ202005024.htmHe J, Huang T, Feng S, et al. Geochemical characteristics of coal and sedimentary environment significance in Xishanyao Formation of Santanghu Coalfield[J]. Coal Science and Technology, 2020, 48(5): 173-181(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-MTKJ202005024.htm [3] 何光玉, 陈汉林, 肖安成, 等. 酒泉侏罗纪含煤盆地性质、原型及资源潜力[J]. 煤炭学报, 2004, 29(3): 313-317. doi: 10.3321/j.issn:0253-9993.2004.03.013He G Y, Chen H L, Xao A C, et al. Basin style, prototype and resource potential of Jurassic coal-bearing basin of Jiuquan, northwestern China[J]. Journal of China Coal Society, 2004, 29(3): 313-317(in Chinese with English abstract). doi: 10.3321/j.issn:0253-9993.2004.03.013 [4] 王帅, 邵龙义, 孙钦平, 等. 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. https://www.cnki.com.cn/Article/CJFDTOTAL-GDLX201802013.htmWang S, Shao L Y, Sun Q P, et al. Sequence-palaeogeography and coal accumulation of the Lower Cretaceous Saihantala Formation in the Bayanbaolige Coalfield, Erlian Basin, Inner Mongolia[J]. Journal of Palaeogeography: Chinese Edition, 2018, 20(2): 325-336(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-GDLX201802013.htm [5] 何治亮, 高山林, 郑孟林. 中国西北地区沉积盆地发育的区域构造格局与演化[J]. 地学前缘, 2015, 22(3): 227-240. https://www.cnki.com.cn/Article/CJFDTOTAL-DXQY201503022.htmHe Z L, Gao S L, Zheng M L. Regional tectonic framework and evolution of superimposed basins in northwestern China[J]. Earth Science Frontiers, 2015, 22(3): 227-240(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-DXQY201503022.htm [6] 戴和武, 陈祢生, 陈文敏. 我国不同成煤时代的含煤分布及其煤质特征的研究[J]. 燃料化学学报, 1981, 9(1): 3-15. https://www.cnki.com.cn/Article/CJFDTOTAL-RLHX198101000.htmDai H W, Chen M S, Chen W M. Study on coal content distribution and coal quality characteristics in different coal forming ages[J]. Journal of Fuel Chemistry and Technology, 1981, 9(1): 3-15(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-RLHX198101000.htm [7] 赵应成, 王新民, 袁剑英, 等. 贺西地区盆地构造特征与油气分布[J]. 石油学报, 1999, 20(5): 13-19. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB199905003.htmZhao Y C, Wang X M, Yuan J Y, et al. Tectonic characteristics and oil-gas distribution in Hexi region[J]. Acta Petrolei Sinica, 1999, 20(5): 13-19(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB199905003.htm [8] 龚全胜, 刘明强. 甘肃北山造山带类型及基本特征[J]. 西北地质, 2002, 35(3): 28-34. doi: 10.3969/j.issn.1009-6248.2002.03.004Gong Q S, Liu M Q. The type and basic characteristics of Beishan Orogenic Belt, Gansu[J]. Northwestern Geology, 2002, 35(3): 28-34(in Chinese with English abstract). doi: 10.3969/j.issn.1009-6248.2002.03.004 [9] 彭文武. 甘肃北山地区中侏罗世含煤岩系沉积和构造特征[J]. 煤田地质与勘探, 1988, 16(3): 9-11. https://www.cnki.com.cn/Article/CJFDTOTAL-MDKT198803003.htmPeng W W. Sedimentary and tectonic characteristics of Middle Jurassic coal bearing system in Beishan area of Gansu Province[J]. Coal Geology & Exploration, 1988, 16(3): 9-11(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-MDKT198803003.htm [10] 吴传荣, 张慧, 李远虑, 等. 西北早-中侏罗世煤岩煤质与煤变质研究[M]. 北京: 煤炭工业出版社, 1995.Wu C R, Zhang H, Li Y L, et al. Research on coal petrology properties and metamorphism of Early-Mid Jurassic coal in Northwest China[M]. Beijing: China Coal Industry Publishing House, 1995(in Chinese). [11] 高瑞祺, 赵政璋. 中国油气新区勘探: 中国西北地区侏罗系油气分布[M]. 北京: 石油工业出版社, 2001.Gao R Q, Zhao Z Z. The frontier petroleum exploration in China: Jurassic oil and gas distribution in northwestern China[M]. Beijing: Petroleum Industry Press, 2001(in Chinese). [12] 邓胜徽, 姚益民, 叶得泉, 等. 中国北方侏罗系: Ⅰ. 地层总述[M]. 北京: 石油工业出版社, 2003.Deng S H, Yao Y M, Ye D Q, et al. Jurassic system in the north of China: Ⅰ. General description[M]. Beijing: Petroleum industry press, 2003(in Chinese). [13] 王红霞, 李睿. 甘肃北山地区沙婆泉期沉积体系特征[J]. 甘肃科技, 2013, 29(13): 39-41. doi: 10.3969/j.issn.1000-0952.2013.13.016Wang H X, Li R. Characteristics of Shapoquan period sedimentation system in Beishan area, Gansu Province[J]. Gansu Science and Technology, 2013, 29(13): 39-41(in Chinese with English abstract). doi: 10.3969/j.issn.1000-0952.2013.13.016 [14] 李祖望, 段文海, 张亚玲. 驼马滩盆地含煤地层时代的厘定与我国北方早白垩世含煤地层对比[J]. 中国煤田地质, 1993, 5(3): 17-19. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGMT199303005.htmLi Z W, Duan W H, Zhang Y L. The determination of coal formation in Tuomatan Basin, compared with Early Cretaceous formation in northern China[J]. Coal Geology of China, 1993, 5(3): 17-19(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-ZGMT199303005.htm [15] 宋杰己. 甘肃省的白垩系[J]. 甘肃地质学报, 1993, 2(增刊): 1-49. https://www.cnki.com.cn/Article/CJFDTOTAL-GSDZ1993S1000.htmSong J J. Cretaceous system in Gansu[J]. Acta Geologica Gansu, 1993, 2(S): 1-49(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-GSDZ1993S1000.htm [16] 高占斌, 张万. 甘肃肃北吐鲁-驼马滩矿区构造特征及煤炭资源浅析[J]. 甘肃科技, 2014, 30(20): 32-37. doi: 10.3969/j.issn.1000-0952.2014.20.011Gao Z B, Zhang W. Structural features and coal resources in Tulu-Humatan mining area in Subei, Gansu Province[J]. Gansu Science and Technology, 2014, 30(20): 32-37(in Chinese with English abstract). doi: 10.3969/j.issn.1000-0952.2014.20.011 [17] 张国英, 孙永君, 刘百成, 等. 甘肃北山红石山地区早白垩世地层的发现及其时代讨论[J]. 甘肃地质学报, 2005, 14(1): 5-8. https://www.cnki.com.cn/Article/CJFDTOTAL-GSDZ200501002.htmZhang G Y, Sun Y J, Liu B C, et al. The discovery and time-discussion of strata of Early Cretaceous epoch in Hongshishan area of Beishan, Gansu Province[J]. Acta Geologica Gansu, 2005, 14(1): 5-8(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-GSDZ200501002.htm [18] 马小琴, 芦兴武, 王仲学, 等. 公婆泉勘查区含煤地层时代研究[J]. 中州煤炭, 2015, 37(7): 114-117. https://www.cnki.com.cn/Article/CJFDTOTAL-ZZMT201507035.htmMa X Q, Lu X W, Wang Z X, et al. Research on age of coal-hearing strata in Gongpoquan exploration area[J]. Zhongzhou Coal, 2015, 37(7): 114-117(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-ZZMT201507035.htm [19] 吴洪峰, 赵澄林, 时健民. 甘肃北山公婆泉盆地钻孔5005地层时代讨论[J]. 石油与天然气地质, 1998, 19(4): 337-339. https://www.cnki.com.cn/Article/CJFDTOTAL-SYYT804.013.htmWu H F, Zhao C L, Shi J M. Discussion on stratigraphic age of drill hole 5005 in Gongpoquan Basin, Beishan, Gansu[J]. Oil & Gas Geology, 1998, 19(4): 337-339(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-SYYT804.013.htm [20] 卢进才, 魏仙样, 魏建设, 等. 内蒙古银额盆地额济纳旗赛汉陶来地区石炭系-二叠系煤层的发现及其意义[J]. 地质通报, 2013, 32(10): 1653-1664. doi: 10.3969/j.issn.1671-2552.2013.10.017Lu J C, Wei X Y, Wei J S, et al. The Carboniferous-Permian coal-bearing bed in Saihan Toroi area of Ejin Banner within Yin'e Basin, Inner Mongolia, and its significances[J]. Geological Bulletin of China, 2013, 32(10): 1653-1664(in Chinese with English abstract). doi: 10.3969/j.issn.1671-2552.2013.10.017 [21] 张万, 徐锟山, 朱志良, 等. 甘肃北山地区下白垩统含煤地层沉积盆地及含煤性研究[J]. 甘肃地质, 2016, 25(3): 76-81. https://www.cnki.com.cn/Article/CJFDTOTAL-GSDZ201603012.htmZhang W, Xu G S, Zhu Z L, et al. Coal-bearing property of Lower Cretaceous coal basin in Beishan area, Gansu Province[J]. Gansu Geology, 2016, 25(3): 76-81(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-GSDZ201603012.htm [22] 张金龙, 潘志龙, 陈超. 内蒙古北山地区三道明水一带早白垩世赤金堡组沉积特征及时代厘定[J]. 地质调查与研究, 2017, 40(1): 29-34. doi: 10.3969/j.issn.1672-4135.2017.01.004Zhang J L, Pan Z L, Chen C. Sedimentary characteristics and age of the Early Cretaceous Chijinbao Formation in the Sandaomingshui of Beishan area, Inner Mongolia[J]. Geological Survey and Research, 2017, 40(1): 29-34(in Chinese with English abstract). doi: 10.3969/j.issn.1672-4135.2017.01.004 [23] 卜建军, 吴俊, 史冀忠, 等. 北山-巴丹吉林地区石炭纪-二叠纪构造古地理及其演化[J]. 地质科技情报, 2019, 38(6): 113-120. https://www.cnki.com.cn/Article/CJFDTOTAL-DZKQ201906014.htmBu J J, Wu J, Shi J Z, et al. Carboniferous-Permian tectonic paleogeography of Beishan-Badain Jaran region and its evolution[J]. Geological Science and Technology Information, 2019, 38(6): 113-120(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-DZKQ201906014.htm [24] 吴少波, 白玉宝, 杨友运. 北山盆地群侏罗、白垩系沉积体系及其分布、演化[J]. 西北大学学报: 自然科学版, 2003, 33(6): 717-722. doi: 10.3321/j.issn:1000-274X.2003.06.023Wu S B, Bai Y B, Yang Y Y. The Jurassic to Cretaceous sedimentary systems and their distribution and evolution in the Beishan Basins Group[J]. Journal of Northwest University: Natural Science Edition, 2003, 33(6): 717-722(in Chinese with English abstract). doi: 10.3321/j.issn:1000-274X.2003.06.023 [25] 卜建军, 何卫红, 张克信, 等. 古亚洲洋的演化: 来自古生物地层学方面的证据[J]. 地球科学, 2020, 45(3): 711-727. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX202003001.htmBu J J, He W H, Zhang K X, et al. Evolution of the paleo-Asian ocean: Evidences from paleontology and stratigraphy[J]. Earth Science, 2020, 45(3): 711-727(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX202003001.htm [25] 甘肃省地质局地质力学区域测量队. 1: 20万六山幅区域地质测量报告[R]. 北京: 地质出版社, 1979.Geomechanical Regional Survey Team of Gansu Geological Bureau. 1: 200000 mountain regional geological survey report[R]. Beijing: Geological Publishing House, 1979(in Chinese). [26] 甘肃省地质局地质力学区域测量队. 1: 20万黑鹰山幅区域地质测量报告[R]. 北京: 地质出版社, 1978.Geomechanical Regional Survey Team of Gansu Geological Bureau. Geological survey of 1: 200000 blackhawk mountain range regional report[R]. Beijing: Geological Publishing House, 1978(in Chinese). [27] 孙立新, 张云, 张天福, 等. 鄂尔多斯北部侏罗纪延安组、直罗组孢粉化石及其古气候意义[J]. 地学前缘, 2017, 24(1): 32-51. https://www.cnki.com.cn/Article/CJFDTOTAL-DXQY201701004.htmSun L X, Zhang Y, Zhang T F, et al. Jurassic sporopollen of Yan'an Formation and Zhiluo Formation in the northern Ordos Basin, Inner Mongolia, and its paleoclimatic significance[J]. Earth Science Frontiers, 2017, 24(1);32-51(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-DXQY201701004.htm [28] 张明震, 戴霜. 甘肃公婆泉盆地钻孔孢粉记录的晚侏罗世至早白垩世气候变化[C]//中国古生物学会第十一次全国会员代表大会暨第27届学术年会. 2013.Zhang M Z, Dai S. Late jurassic to early cretaceous climate change recorded by Gansu in-laws Spring Basin[C]//Summary of Papers of the 11th National Congress of Members and of the 27th Annual Conference of the Chinese Palaeontological Society. Dongyan: [s. n. ], 2013(in Chinese). [29] 甘肃省地质局. 1: 20万五道明幅区域地质测量报告[R]. 兰州: 甘肃省地质局, 1978.Gansu Provincial Geological Bureau. 1: 200000 five channel area geological survey report[R]. Lanzhou: Gansu Provincial Geological Bureau, 1978(in Chinese). [30] 阎存凤, 赵应成, 魏东涛, 等. 甘肃北山下白垩统老树窝群孢粉组合[C]//中国古生物学会第21届学术年会论文摘要集. 2001.Yan C F, Zhao Y C, Wei D T, et al. Spore combination of lower cretaceous formation in Beishan, Gansu[C]//Abstract of the 21st Annual Conference of the Chinese Society of Palaeontology. Xi'an: [s. n. ], 2001(in Chinese). [31] 黄文辉, 唐书恒, 唐修义. 西北地区侏罗纪煤的煤岩学特征[J]. 煤田地质与勘探, 2010, 38(4): 5-10. https://www.cnki.com.cn/Article/CJFDTOTAL-MDKT201004002.htmHuang W H, Tang S H, Tang X Y. The Jurassic coal petrology and the research significance of Northwest China[J]. Coal Geology & Exploration, 2010, 38(4): 5-10(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-MDKT201004002.htm [32] 刘洪胜, 骆洪达, 吕超. 内蒙古红柳大泉勘查区煤层煤质特征研究[J]. 山东国土资源, 2017, 33(10): 30-33. https://www.cnki.com.cn/Article/CJFDTOTAL-SDDI201710006.htmLiu H S, Luo H D, Lü C. Study on characteristics of coal strata in Hongliudaquan exploration area in Inner Mongolia[J]. Shandong Land and Resources, 2017, 33(10): 30-33(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-SDDI201710006.htm [33] 李盛富, 陈洪德, 周剑, 等. 新疆伊犁盆地南缘中新生代以来构造演化与聚煤规律研究[J]. 西北地质, 2016, 49(2): 220-228. https://www.cnki.com.cn/Article/CJFDTOTAL-XBDI201602022.htmLi S F, Chen H D, Zhou J, et al. Tectonic evolution and coal accumulation about the southern margin of Yili Basin in Xinjiang since Middle Cenozoic[J]. Northwestern Geology, 2016, 49(2): 220-228(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-XBDI201602022.htm [34] 韩小锋, 牛海青, 卜建军, 等. 甘蒙地区北山盆地群中口子盆地侏罗系烃源岩特征及评价[J]. 地质科技情报, 2019, 38(5): 46-53. https://www.cnki.com.cn/Article/CJFDTOTAL-DZKQ201905004.htmHan X F, Niu H Q, Bu J J, et al. Characteristics and evaluation of Jurassic source rocks in Zhongkouzi Basin, Beishan Basins, Gansu-Inner Mongolia area[J]. Geological Science and Technology Information, 2019, 38(5): 46-53(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-DZKQ201905004.htm [35] 李明杰, 郑孟林, 曹春潮, 等. 北山-阿拉善地区侏罗-白垩纪盆地的叠合演化[J]. 石油与天然气地质, 2004, 25(1): 54-57. https://www.cnki.com.cn/Article/CJFDTOTAL-SYYT200401009.htmLi M J, Zheng M L, Cao C C, et al. Evolution of superposed Jurassic and Cretaceous basins in Beishan-Alxa area[J]. Oil & Gas Geology, 2004, 25(1): 54-57(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-SYYT200401009.htm