Sequence lithofacies paleogeography of the Ordovician in Ordos Basin, China

doi:10.7623/syxb2012S2009

Editorial office of ACTA PETROLEI SINICA ›› 2012, Vol. 33 ›› Issue (S2): 95-109.DOI: 10.7623/syxb2012S2009

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Sequence lithofacies paleogeography of the Ordovician in Ordos Basin, China

GUO Yanru 1 　ZHAO Zhenyu 1　 FU Jinhua 2　 XU Wanglin 1　 SHI Xiaoying 3　SUN Liuyi 2 　GAO Jianrong 1 　ZHANG Yanling 1 　ZHANG Yueqiao 1 　LIU Junbang 1 　LIU Hong 1

Received:2012-06-08 Revised:2012-08-15 Online:2012-12-25 Published:2013-03-01

鄂尔多斯盆地奥陶纪层序岩相古地理

郭彦如 1 　赵振宇 1 　付金华 2 　徐旺林 1　史晓颖 3　孙六一 2 　高建荣 1 　张延玲 1 　张月巧 1　刘俊榜 1 　刘　虹 1

1.中国石油勘探开发研究院北京 100083; 2.中国石油长庆油田公司西安 710021; 3.中国地质大学地球科学与资源学院北京 100083

通讯作者: 郭彦如
作者简介:郭彦如，男，1962年6月生，1982年获西北大学学士学位，2002年获中国地质大学（北京）博士学位，现为中国石油勘探开发研究院高级工程师，主要从事石油地质和层序地层学方面的研究工作。
基金资助:
国家重大科技专项（2008ZX05004-001，2011ZX05004-002）、中国石油天然气股份有限公司重大科技专项（2008E-0706）资助。

Abstract

Abstract:

Through the sedimentological observations of a large number of outcrops and wells, this study prepared the lithofacies paleogeographic maps of the Ordovician in Ordos Basin in a 3rd-order sequence stratigraphic framework. In the Lower Ordovician, the Ordos Basin was divided into two sedimentary areas (i.e., eastern and western carbonate platforms) by the south-north Yimeng-Central Palaeouplift, where the sedimentary paleogeography was controlled by the North China Sea and the Qilian Sea, respectively. In the Lower-to-Middle Ordovician, the transgression occurred and Yimeng-Central Palaeouplift gradually reduced in the basin. In the Middle Ordovician, the Yimeng-Central Palaeouplift was largely submerged by seawater and divided into two parts, i.e., Qingyang oldland in the south and Yimeng oldland in the north. In the late Middle Ordovician, i.e., the Darriwilian Age (deposition period of the 6th Member of Majiagou Formation), the transgression occurred in the maximum scale. In the Upper Ordovician, the regression occurred, resulting in the vast denuded zones of oldland in the present Ordos Basin with narrow open rimmed platforms and slope facies in the western and southern margins of the basin. In the middle-to-late Upper Ordovician (Katian-Himantian Age), the Ordos Basin almost entirely uplifted to the continent. From Floian Age (the late Lower Ordovician) to Darriwilian Age (the middle stage of Middle Ordovician), i.e., deposition period of the 1st-5th Members of Majiagou Formation, an evaporation environment was formed in vast areas of the eastern basin, leading to the formation of localized lagoon and even gypsum salt lagoon. The western and southern basin was controlled by the development and evolution of Helan Aulacogen and Qinqi Troughs and mainly developed continental margin sediments, which evolved from the carbonate ramps of passive continental margin in the Lower and early Middle Ordovician to the rimmed platform of active continental system in the late Middle and Upper Ordovician.

Key words: Ordovician, sequence stratigraphy, sedimentary facies, lithofacies paleogeography, Ordos Basin

摘要：

通过大量露头与钻井沉积相观察，系统编制了三级层序地层格架下的鄂尔多斯盆地奥陶纪岩相古地理图。研究认为，早奥陶世发育近SN走向的伊盟-中央古陆将盆地分为东、西2部分碳酸盐台地沉积区，其沉积古地理分别受控于华北海及祁连海;由早奥陶世至中奥陶世盆地总体呈现出逐渐海侵及伊盟-中央古陆逐渐缩小的过程，伊盟-中央古陆在中奥陶世大部分被海水侵没并已分化为南、北相隔的2个古陆即庆阳古陆和伊盟古陆，至中奥陶世晚期即达瑞威尔期（马家沟组六段沉积期）海侵达到最大范围;晚奥陶世发生海退，造成现今鄂尔多斯盆地范围内大部分表现为古陆剥蚀区，仅在盆地西缘及南缘发育了较窄的开阔镶边台地及其斜坡相沉积，至晚奥陶世中晚期（凯特期-赫南特期）几乎全部隆升为陆。自早奥陶世晚期（弗洛期）至中奥陶世中期（达瑞威尔初期）即马家沟组一段至五段沉积期，盆地中东部发育大面积的局限蒸发环境，形成局限潟湖甚至膏盐潟湖。盆地西部与南部受贺兰拗拉槽与秦祁海槽发展演化控制，主要发育大陆边缘沉积体系，由早奥陶世-中奥陶世早期的被动陆缘碳酸盐缓坡台地向中奥陶世晚期-晚奥陶世的主动陆缘弱镶边碳酸盐台地演化。

关键词: 奥陶纪, 层序地层, 沉积相, 岩相古地理, 鄂尔多斯盆地

GUO Yanru ZHAO Zhenyu FU Jinhua XU Wanglin SHI Xiaoying SUN Liuyi . Sequence lithofacies paleogeography of the Ordovician in Ordos Basin, China[J]. Editorial office of ACTA PETROLEI SINICA, 2012, 33(S2): 95-109.

郭彦如赵振宇付金华徐旺林史晓颖孙六一高建荣张延玲张月巧刘俊榜刘　虹 . 鄂尔多斯盆地奥陶纪层序岩相古地理[J]. 石油学报, 2012, 33(S2): 95-109.

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Sequence lithofacies paleogeography of the Ordovician in Ordos Basin, China

鄂尔多斯盆地奥陶纪层序岩相古地理

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