Types and distribution characteristics of the Caledonian unconformities in Ordos Basin
XIONG Jiabei1,2,3, HE Dengfa1,2,
1 School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China; 2 Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism(Ministry of Education), China University of Geosciences(Beijing),Beijing 100083,China; 3 PetroChina Zhejiang Oilfield Company,Hangzhou 311100,China;
Abstract The Caledonian unconformity is an important interface for transformation of basin types in the Early Paleozoic North China plate. The discovery of Ordovician weathered crust and paleokarsts as the oil and gas reservoirs and aluminous mudstone gas reservoirs in the Benxi and Taiyuan formations in the Ordos Basin has promoted geologists to explore the Caledonian orogeny in the Paleozoic in this area. Based on a number of field outcrops,drilling and seismic data,the following understandings are obtained with respect to the identification marks,geography,structures and time variables of the unconformity formed by the orogeny. (1)The paleogeomorphic formed after the Caledonian orogeny can be roughly divided into the highland area of Etok Banner-Dingbian area,the geomorphic transition area of Shenmu-Jingbian-Fuxian and Wuzhong areas,and the low-lying and gently eastward inclined area in the Middle East. (2)The adjacent strata of the unconformity surface at the top of the Ordovician are in contact with different angles,and have the structure of “truncation(bottom)-integration(top)”,“truncation(bottom)-overlap(top)”,which is characterized by a high-angle unconformity of cutting and folding at the basinal edge,a low-angle unconformity from basinal edge to the basin,widely distributed parallel unconformity in the basin. (3)The unconformity in this area is also the main weathering crust interface formed between the Upper and Lower Paleozoic. The long-term sedimentary discontinuity and weathering and denudation have laid an environmental background for the development of aluminous mudstone in this area. Bauxite is not only an ideal caprock for the Lower Paleozoic gas reservoir,but also a favorable place for large-scale accumulation of natural gas in the Longdong exploration new area,which is worthy of attention.
Fund:Co-funded by the United Foundation Project of the National Natural Science Foundation of China for Company Innovation and Development(No. U19B6003),and the Project of Tackling the Science and Technological Key Problems in PetroChina Changqing Oil and Gas Field Company(No. ZDZX2021-01)
Corresponding Authors:
HE Dengfa,born in 1967,graduated from Geology Department, Northwest University in 1989. Now he is mainly engaged in structural analysis of petroliferous basins. E-mail: hedengfa282@263.net.
About author: XIONG Jiabei,born in 1997,is a master degree candidate of China University of Geosciences(Beijing). Now she is mainly engaged in researches of the depositional basin tectonic characteristics. E-mail: 805590121@qq.com.
Cite this article:
XIONG Jiabei,HE Dengfa. Types and distribution characteristics of the Caledonian unconformities in Ordos Basin[J]. JOPC, 2022, 24(5): 970-988.
XIONG Jiabei,HE Dengfa. Types and distribution characteristics of the Caledonian unconformities in Ordos Basin[J]. JOPC, 2022, 24(5): 970-988.
[1] 包洪平,杨帆,白海峰,武春英,王前平. 2017. 细分小层岩相古地理编图的沉积学研究及油气勘探意义: 以鄂尔多斯地区中东部奥陶系马家沟组马五段为例. 岩石学报, 33(4): 1094-1106. [Bao H P,Yang F,Bai H F,Wu X Y,Wang Q P.2017. Sedimentology study on sub-member lithofacies paleogeography mapping and its petroleum exploration significance: taking Ma5 member of Lower Ordovician Majiagou Formation in central-eastern Ordos Basin for example. Acta Petrologica Sinica, 33(4): 1094-1106] [2] 陈安清. 2010. 鄂尔多斯地块早古生代盆地演化与物质聚集规律. 成都理工大学博士学位论文. [Chen A Q.2010. Basin Evolution and Sediments Accumulation during Eopaleozoic in Ordos Continental Block. Doctoral dissertation of Chengdu University of Technology] [3] 陈发景,张光亚,陈昭年. 2004. 不整合分析及其在陆相盆地构造研究中的意义. 现代地质, 18(3): 269-275. [Chen F J,Zhang G Y,Chen Z N.2004. Unconformity analysis and its significance in the study of continental basin tectonics. Geoscience, 18(3): 269-275] [4] 陈洪德,侯中健,田景春,刘文均,张锦泉. 2001. 鄂尔多斯地区晚古生代沉积层序地层学与盆地构造演化研究. 矿物岩石, 21(3): 16-23. [Chen H D,Hou Z J,Tian J C,Liu W J,Zhang J Q.2001. Study on sequence stratigraphy of deposits and tectono-sedimentary evolution in Ordos Basin during Late Paleozoic. Journal of Mineralogy and Petrology, 21(3): 16-23] [5] 代金友. 2016. 鄂尔多斯古岩溶气藏地质特征及成藏富集规律. 北京: 石油工业出版社,231. [Dai J Y.2016. Geological Characteristics and Accumulation Law of Paleokarst Gas Reservoirs in Ordos Basin. Beijing: Petroleum Industry Press,231] [6] 冯娟萍,欧阳征健,陈全红,李文厚. 2021. 鄂尔多斯盆地及周缘地区上石炭统沉积特征. 古地理学报, 23(1): 53-64. [Feng J P,Ouyang Z J,Chen Q H,Li W H.2021. Sedimentary characteristics of the Upper Carboniferous in Ordos Basin and its adjacent areas. Journal of Palaeogeography(Chinese Edition), 23(1): 53-64] [7] 冯增昭,鲍志东. 1999. 鄂尔多斯奥陶纪马家沟期岩相古地理. 沉积学报, 17(1): 1-8. [Feng Z Z,Bao Z D.1999. Lithofacies paleogeography of Majiagou Age of Ordovician in Ordos Basin. Acta Sedimentologica Sinica, 17(1): 1-8] [8] 付金华. 1991. 鄂尔多斯盆地古生界盖层封盖性研究. 天然气工业, 11(6): 6-11. [Fu J H.1991. A study of the sealing properties of the Paleozoic caprocks in Erduosi Basin. Natural Gas Industry, 11(6): 6-11] [9] 付金华. 2018. 鄂尔多斯盆地下古生界海相碳酸盐岩油气地质与勘探. 北京: 石油工业出版社,217. [Fu J H.2018. Petroleum Geology and Exploration of Lower Paleozoic Marine Carbonate Rocks in Ordos Basin. Beijing: Petroleum Industry Press,217] [10] 付金华,李明瑞,张雷,曹茜,魏新善. 2021. 鄂尔多斯盆地陇东地区铝土岩天然气勘探突破与油气地质意义探索. 天然气工业, 41(11): 1-11. [Fu J H,Li M R,Zhang L,Cao Q,Wei X S.2021. Breakthrough in the exploration of bauxite gas reservoir in Longdong area of the Ordos Basin and its petroleum geological implications. Natural Gas Industry, 41(11): 1-11] [11] 高春云,周立发. 2019. 鄂尔多斯盆地西缘南段若干不整合面特征及其构造意义. 地质科技情报, 38(6): 121-132. [Gao C Y,Zhou L F.2019. Geological characteristics of unconformities and their tectonic significance in the southern section of western Ordos Basin. Geological Science and Technology Information, 38(6): 121-132] [12] 顾其昌. 1996. 宁夏回族自治区岩石地层. 武汉: 中国地质大学出版社,132. [Gu Q C.1996. Lithostratigraphy of Ningxia Hui Autonomous Region. Wuhan: China University of Geosciences Press,132] [13] 何碧竹,焦存礼,许志琴,刘士林,蔡志慧,李海兵,张淼. 2013. 不整合结构构造与构造古地理环境: 以加里东中期青藏高原北缘及塔里木盆地为例. 岩石学报, 29(6): 2184-2198. [He B Z,Jiao C L,Xu Z Q,Liu S L,Cai Z H,Li H B,Zhang M.2013. Unconformity structural architecture and tectonic paleo-geographic environment: a case of the Middle Caledonian on the northern margin of Tibet Plateau and Tarim Basin. Acta Petrologica Sinica, 29(6): 2184-2198] [14] 何碧竹,许志琴,焦存礼,李海兵,蔡志慧. 2011. 塔里木盆地构造不整合成因及对油气成藏的影响. 岩石学报, 27(1): 253-265. [He B Z,Xu Z Q,Jiao C L,Li H B,Cai Z H.2011. Tectonic unconformities and their forming: implication for hydrocarbon accumulations in Tarim Basin. Acta Petrologica Sinica, 27(1): 253-265] [15] 何登发. 2007. 不整合面的结构与油气聚集. 石油勘探与开发, 34(2): 142-150. [He D F.2007. Structure of unconformity and its control on hydrocarbon accumulation. Petroleum Exploration and Development, 34(2): 142-150] [16] 何登发. 2018. “下削上超”地层不整合的基本类型与地质意义. 石油勘探与开发, 45(6): 995-1006. [He D F.2018. Basic types and geologic significances of“truncation and onlap”unconformities. Petroleum Exploration and Development, 45(6): 995-1006] [17] 何登发,包洪平,开百泽,魏柳斌,许艳华,马静辉,成祥. 2021. 鄂尔多斯盆地及其邻区关键构造变革期次及其特征. 石油学报, 42(10): 1255-1269. [He D F,Bao H P,Kai B Z,Wei L B,Xu Y H,Ma J H,Cheng X.2021. Critical tectonic modification periods and its geologic features of Ordos Basin and adjacent area. Acta Petrolei Sinica, 42(10): 1255-1269] [18] 侯连华,杨帆,陶士振,杨春. 2017. 地层油气藏. 武汉: 中国地质大学出版社,351. [Hou L H,Yang F,Tao S Z,Yang C.2017. Stratigraphic Reservoir. Wuhan: China University of Geosciences Press,351] [19] 贾浪波,钟大康,孙海涛,严锐涛,张春林,莫午零,邱存,董媛,李兵,廖广新. 2019. 鄂尔多斯盆地本溪组沉积物物源探讨及其构造意义. 沉积学报, 37(5): 1087-1103. [Jia L B,Zhong D K,Sun H T,Yan R T,Zhang C L,Mo W L,Qiu C,Dong Y,Li B,Liao G X.2019. Sediment provenance analysis and tectonic implication of the Benxi Formation,Ordos Basin. Acta Sedimentologica Sinica, 37(5): 1087-1103] [20] 李朝阳,刘玉平,管太阳,皮道会,叶霖. 2004. 不整合面中的成矿机制与找矿研究. 地学前缘, 11(2): 353-360. [Li C Y,Liu Y P,Guan T Y,Pi D H,Ye L.2004. Mineralization mechanism and prospection on unconformable contacts. Earth Science Frontiers, 11(2): 353-360] [21] 李军亮. 2017. 柴北缘中部古近纪—新近纪构造演化与沉积充填耦合关系研究. 中国石油大学(华东)博士学位论文. [Li J L.2017. Coupling Relation between Tectonic Evolution and Sedimentary Filling in Central Part of North Margin of Qaidam Basin during Paleogene-Neogene. Doctoral dissertation of China University of Petroleum(East China)] [22] 李攀,李永强,经俭波,曹正林,袁选俊. 2020. 准噶尔盆地西北部P-T转换期不整合的发育演化特征及意义. 古地理学报, 22(4): 697-714. [Li P,Li Y Q,Jing J B,Cao Z L,Yuan X J.2020. Unconformities formed during the P-T transition in the northwestern Junggar Basin: nature,evolution and implications. Journal of Palaeogeography(Chinese Edition), 22(4): 697-714] [23] 李文国. 1996. 内蒙古自治区岩石地层. 武汉: 中国地质大学出版社,344. [Li W G.1996. Lithostratigraphy of Inner Mongolia Autonomous Region. Wuhan: China University of Geosciences Press, 344] [24] 李文厚,陈强,李智超,王若谷,王妍,马瑶. 2012. 鄂尔多斯地区早古生代岩相古地理. 古地理学报, 14(1): 85-100. [Li W H,Chen Q,Li Z C,Wang R G,Wang Y,Ma Y.2012. Lithofacies palaeogeography of the Early Paleozoic in Ordos area. Journal of Palaeogeography(Chinese Edition), 14(1): 85-100] [25] 李相博,王宏波,黄军平,张才利,张艳,王雅婷,张雷,王菁,刘化清. 2021. 鄂尔多斯盆地怀远运动不整合面特征及油气勘探意义. 石油与天然气地质, 42(5): 1043-1055. [Li X B,Wang H B,Huang J P,Zhang C L,Zhang Y,Wang Y T,Zhang L,Wang J,Liu H Q.2021. Characteristics of unconformity resulted from Huaiyuan Movement in Ordos Basin and its significance for oil and gas exploration. Oil & Gas Geology, 42(5): 1043-1055] [26] 林畅松. 2006. 沉积盆地的构造地层分析: 以中国构造活动盆地研究为例. 现代地质, 20(2): 185-194. [Lin C S.2006. Tectono-stratigraphic analysis of sedimentary basins: a case study on the inland tectonically active basins in China. Geoscience, 20(2): 185-194] [27] 林畅松. 2009. 沉积盆地的层序和沉积充填结构及过程响应. 沉积学报, 27(5): 849-862. [Lin C S.2009. Sequence and depositional architecture of sedimentary basin and process responses. Acta Sedimentologica Sinica, 27(5): 849-862] [28] 刘波,王英华. 1997. 华北奥陶系两个不整合面的成因与相关区域性储层预测. 沉积学报, 15(1): 26-31. [Liu B,Wang Y H.1997. The two Ordovician unconformities in N. China: their origins and related regional reservoir's prediction. Acta Sedimentologica Sinica, 15(1): 26-31] [29] 刘化清,李相博,马玉虎,白云来,黄军平. 2021. 鄂尔多斯盆地怀远运动不整合面与深层天然气勘探领域. 天然气工业, 41(6): 1-12. [Liu H Q,Li X B,Ma Y H,Bai Y L,Huang J P.2021. The unconformity caused by the Huaiyuan movement and the deep natural gas exploration field in the Ordos Basin. Natural Gas Industry, 41(6): 1-12] [30] 刘文辉,潘和平,李健伟,赵景. 2015. 鄂尔多斯盆地大牛地气田铝土质泥岩储层的测井评价. 天然气工业, 35(5): 24-30. [Liu W H,Pan H P,Li J W,Zhao J.2015. Well logging evaluation on bauxitic mudstone reservoirs in the Daniudi Gasfield,Ordos Basin. Natural Gas Industry, 35(5): 24-30] [31] 马润华. 1998. 陕西省岩石地层. 武汉: 中国地质大学出版社,291. [Ma R H.1998. Lithostratigraphy of Shaanxi Province. Wuhan: China University of Geosciences Press,291] [32] 马振芳,周树勋. 1999. 鄂尔多斯盆地中东部奥陶系顶部古风化壳特征及其与天然气富集的关系. 石油勘探与开发, 26(5): 21-23. [Ma Z F,Zhou S X.1999. The weathered paleocrust on the Ordovician in Ordos Basin and its relationship to gas accumulation. Petroleum Exploration and Development, 26(5): 21-23] [33] 冉樱. 2011. 苏里格气田东部奥陶系马五段天然气成藏规律研究. 成都理工大学硕士学位论文. [Ran Y.2011. Research on the Rules of Hydrocarbon Accumulation of Majiagou 5th Members of Ordovician in the Eastern of Sulige Gas Field. Masteral dissertation of Chengdu University of Technology] [34] 任纪舜,徐芹芹,邓平,肖黎微. 2016. 构造旋回与大地构造年表. 地球学报, 37(5): 528-534. [Ren J S,Xu Q Q,Deng P,Xiao L W.2016. Tectonic cycles and tectonic timescale. Acta Geoscientica Sinica, 37(5): 528-534] [35] 师平平,肖安成,付金华,吴磊,周义军,王依平,覃素华,张万福. 2021. 鄂尔多斯地块南缘奥陶纪前陆盆地的沉积大地构造格架与演化. 岩石学报, 37(8): 2531-2546. [Shi P P,Xiao A C,Fu J H,Wu L,Zhou Y J,Wang Y P,Qin S H,Zhang W F.2021. The sedimentary and tectonicframework of the Ordovician foreland basin in the southern margin of the Ordos Block and its evolution. Acta Petrologica Sinica, 37(8): 2531-2546] [36] 宋奠南. 2001. 对怀远运动的再认识. 山东地质, 17(1): 19-23. [Song D N.2001. Re-recognition of Huaiyuan Movement. Shandong Geology, 17(1): 19-23] [37] 王振涛,周洪瑞,王训练,景秀春,张永生. 2015. 鄂尔多斯盆地西南缘奥陶纪火山活动记录: 来自陕甘地区平凉组钾质斑脱岩地球化学和锆石年代学的信息. 岩石学报, 31(9): 2633-2654. [Wang Z T,Zhou H R,Wang X L,Jing X C,Zhang Y S.2015. Volcanic event records at the southwestern Ordos Basin: the message from geochemical and zircon U-Pb geochronology of K-bentonites from Pingliang Formation,Shaanxi and Gansu region. Acta Petrologica Sinica, 31(9): 2633-2654] [38] 吴孔友. 2009. 不整合纵向结构及其成藏作用物理模拟. 石油实验地质, 31(5): 537-541. [Wu K Y.2009. Vertical structures of unconformity and its simulation experiment of hydrocarbon accumulation mechanism. Petroleum Geology & Experiment, 31(5): 537-541] [39] 武铁山. 1997. 山西省岩石地层. 武汉: 中国地质大学出版社,353. [Wu T S.1997. Lithostratigraphy of Shanxi Province. Wuhan: China University of Geosciences Press,353] [40] 杨华,刘新社,闫小雄. 2015. 鄂尔多斯盆地晚古生代以来构造-沉积演化与致密砂岩气成藏. 地学前缘, 22(3): 174-183. [Yang H,Liu X S,Yan X X.2015. The relationship between tectonic-sedimentary evolution and tight sandstone gas reservoir since the Late Paleozoic in Ordos Basin. Earth Science Frontiers, 22(3): 174-183] [41] 杨俊杰. 2002. 鄂尔多斯盆地构造演化与油气分布规律. 北京: 石油工业出版社,228. [Yang J J.2002. Tectonic Evolution and Hydrocarbon Distribution in Ordos Basin. Beijing: Petroleum Industry Press,228] [42] 尹微,陈昭年,许浩,司玉梅. 2006. 不整合类型及其油气地质意义. 新疆石油地质, 27(2): 109-111. [Yin W,Chen Z N,Xu H,Si Y M.2006. Unconformity type and its significance in petroleum geology. Xinjiang Petroleum Geology, 27(2): 109-111] [43] 袁见齐,霍承禹,蔡克勤. 1985. 干盐湖阶段的沉积特征兼论钾盐矿层的形成. 地球科学,10(4): 5-13. [Yuan J Q,Huo C Y,Cai K Q.1985. Characteristics of salt deposits in the dry salt lake and the formation of potash beds. Earth Science,10(4): 5-13] [44] 袁卫国,王平. 1996. 鄂尔多斯盆地南部地区的加里东运动. 西安工程学院学报, 18(1): 36-42. [Yuan W G,Wang P.1996. On the Caledonian Movement in the southern Ordos Basin. Journal of Xi'an Engineering University, 18(1): 36-42] [45] 翟裕生. 1965. 不整合面对内生成矿作用的意义. 地质论评, 23(5): 359-364. [Zhai Y S.1965. The significance of unconformity to the endogenetic mineralization. Geological Review, 23(5): 359-364] [46] 张克银,艾华国,吴亚军. 1996. 碳酸盐岩顶部不整合面结构层及控油意义. 石油勘探与开发, 23(5): 16-19. [Zhang K Y,Ai H G,Wu Y J.1996. Characteristics and oil-controlling significance of unconformity structure layer on top of carbonate rock. Petroleum Exploration and Development, 23(5): 16-19] [47] 赵文智,李建忠,杨涛,王淑芳,黄金亮. 2016. 中国南方海相页岩气成藏差异性比较与意义. 石油勘探与开发, 43(4): 499-510. [Zhao W Z,Li J Z,Yang T,Wang S F,Huang J L.2016. Geological difference and its significance of marine shale gases in South China. Petroleum Exploration and Development, 43(4): 499-510] [48] 周义军,杨遂正,王欣. 2006. 鄂尔多斯盆地奥陶系顶面演化与岩溶储层. 石油物探, 45(3): 304-310. [Zhou Y J,Yang S Z,Wang X.2006. The structural-interface evolution in Ordovician and karst reservoir in Ordos Basin. Geophysical Prospecting For Petroleum, 45(3): 304-310] [49] Catuneanu O.2006. Principles of Sequence Stratigraphy. Amsterdam: Elsevier, 1-375. [50] Grabau A W.1906. Types of sedimentary overlap. Geological Society of America Bulletin, 17(1): 567-636. [51] Haq B U,Hardenbol J,Vail P R.1987. Chronology of fluctuating sea levels since the Triassic(250 million years ago to present). Science, 235: 1156-1166. [52] Little A L.1969. The engineering classification of residual tropical soils. 7th International Conference on Soil Mechanics and Foundation Engineering,Special Session on the Engineering Properties of Lateritic Soils. Mexico City: 1-10. [53] Mitchum R M,Vail P R,Sangree J B.1977. Seismic stratigraphy and global changes of sea level,part 6: stratigraphic interpretation of seismic reflection patterns in depositional sequences. In: Pay C E(ed). Seismic Stratigraphy: applications to Hydrocarbon Exploration. AAPG Memoir, 26: 117-133. [54] Sloss L L.1963. Sequences in the cratonic interior of North America. Geological Society of America Bulletin, 74(2): 93-114. [55] Wheeler H E.1964. Baselevel,lithosphere surface,and time-stratigraphy. GSA Bulletin, 75(7): 599-610.
