ISSN 1672-9854
CN 33-1328/P

Evolution and lithofacies paleogeographic characteristics of the Pre-Mesozoic prototype basin in Volga-Urals Basin

  • FENG Jiarui , 1 ,
  • WEN Zhixin 1 ,
  • HE Zhengjun 1 ,
  • CHEN Xuan 2 ,
  • MENG Qingyang 1 ,
  • MA Chao 1 ,
  • SU Ling 1 ,
  • WANG Yonghua 1
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  • 1. Research Institute of Petroleum Exploration & Development, PetroChina
  • 2. Yangtze University

FENG Jiarui, Senior Engineer, focused on oil and gas reservoirs, global unconventional resource evaluation and advanced zone optimization. Add: No. 20 Xueyuan Rd., Haidian District, Beijing 100083, China. E-mail:

Received date: 2025-02-28

  Revised date: 2025-06-18

  Online published: 2025-09-18

Abstract

The Volga-Urals Basin is a typical foreland basin on the Eastern European Platform, accounting for a significant proportion of global conventional and unconventional oil and gas reserves. However, the understanding of its basin formation and reservoir accumulation remains limited. Through systematic investigation of geological data, the evolution of the basin and its lithofacies paleogeographic characteristics are comprehensively analyzed based on the sedimentary filling features during different Pre-Mesozoic geological periods. The results show that: (1) Under the influence of different tectonic stresses such as tensional stress and compressional stress, the Volga Ural Basin underwent tectonic evolutionary stages of extensional and compressional regimes, developing four prototype basin types/stages: intracontinental rift, passive continental margin, back-arc depression, and back-arc foreland basin. (2) During different tectonic evolution processes, the basin has undergone multiple-cycle changes from terrestrial to marine and back to terrestrial. During the Meso-Neoproterozoic, the basin remained generally stable with sedimentation confined to its eastern region, dominated by terrestrial clastic deposits; in the Early Ordovician, the opening of the Ural Ocean led to a marine transgression across the East European Platform, characterized primarily by shallow marine carbonates; beginning in the Devonian, the basin underwent multiple regressive-transgressive cycles; by the end of the Permian, the entire basin was fully uplifted and subjected to erosion. (3) The basin developed four petroleum systems, with the Domanik Formation serving as the primary source rock. The transitional facies and shallow marine facies developed during the transgressive phase constitute two critical hydrocarbon reservoir units in the basin. Muhanovo-Erohovsk Sag and Kashan-Kama Depression are respectively the key area for unconventional and conventional oil and gas exploration in the future. The research findings provide a critical foundation for the evaluation of overseas oil and gas projects and the implementation of exploration and development practices.

Cite this article

FENG Jiarui , WEN Zhixin , HE Zhengjun , CHEN Xuan , MENG Qingyang , MA Chao , SU Ling , WANG Yonghua . Evolution and lithofacies paleogeographic characteristics of the Pre-Mesozoic prototype basin in Volga-Urals Basin[J]. Marine Origin Petroleum Geology, 2025 , 30(5) : 447 -456 . DOI: 10.3969/j.issn.1672-9854.2025.05.006

0 前言

据Rystad 2023年统计[1],全球共发现21 361个前中生界古老油气藏,主要分布于特提斯构造域两侧与古老克拉通相关的前陆盆地、被动陆缘和克拉通盆地,油气可采储量为2 780×108 t油当量,其中伏尔加—乌拉尔盆地的储量排在第4位。伏尔加—乌拉尔盆地大部分油气分布在上古生界泥盆系和石炭系,常规和非常规油气资源勘探潜力巨大[2-4]
伏尔加—乌拉尔盆地位于东欧地台东南部边缘,属叠合型盆地,经历了多期构造演化阶段,现今为前陆盆地,其形成与潘基亚超大陆发育过程影响下的乌拉尔碰撞造山事件有关,主要烃源岩层、储层形成于克拉通演化阶段。因此,分析前中生代原型盆地演化与岩相古地理特征,对提升伏尔加—乌拉尔盆地区域地质认识和指导油气勘探实践具有重要意义。
关于伏尔加—乌拉尔盆地的油气地质条件,前人的研究侧重于烃源岩[5-10]与成藏组合[11-16]等方面。本文在前人研究的基础上,通过对东欧地台区域地质特征及原型盆地演化过程的系统研究,分析了伏尔加—乌拉尔盆地在各个地质时期不同类型原型盆地的演化特征和沉积充填过程,编制了原型盆地演化过程剖面图和岩相古地理综合图,恢复、重建古地理环境与构造演化格局,丰富了海外油气地质理论,为常规和非常规油气资源勘探评价提供了新的依据。

1 区域地质概况

伏尔加—乌拉尔盆地位于东欧克拉通的东南部,面积约为70×104 km2,是受控于乌拉尔山的隆升和向西逆冲推挤作用而形成的弧后前陆盆地,呈坳隆相间的格局(图1a)。盆地东部紧邻乌拉尔山系,南部邻接滨里海盆地,西部邻接莫斯科盆地。截至2025年,盆地内共发现油气田2 025个,其中油田1 665个,气田和凝析油田约360个[17];盆地中部以油田为主,在南缘和乌拉尔前渊有部分气田和油气田。
图1 伏尔加—乌拉尔盆地主要油气田分布及地层综合柱状图

Fig. 1 Distribution map of oil and gas fields and stratigraphic comprehensive column in Volga-Urals Basin

伏尔加—乌拉尔盆地的基底主要由太古宇和元古宇的变质岩、火山岩及花岗岩组成,沉积盖层分为上、下两个构造层(图1b图2)。下构造层为中—新元古代拗拉谷陆源碎屑岩,局限分布在基底断陷内;上构造层以晚古生代碳酸盐岩为主,分布范围广泛,局部发育中—新生代沉积。盆地基底埋深由西向东、由北向南逐渐增大[17-18],东部前渊区沉积厚度大且断裂发育,在别尔斯克坳陷区乌拉尔前渊最大埋深超过10 000 m,南部滨里海盆地北缘厚度可达5 000 m。
图2 伏尔加—乌拉尔盆地区域地质剖面图(剖面位置见图1a

Fig. 2 Geological profiles in Volga-Urals Basin (location is shown in Fig. 1a)

图1b所示,伏尔加—乌拉尔盆地从泥盆系到下二叠统均发育储层,泥盆系碎屑岩、石炭系下—中维宪阶碎屑岩、巴什基尔阶—莫斯科阶碳酸盐岩为主要储层。中弗拉阶—杜内阶多玛尼克相沉积以灰色—深灰色沥青质页岩、泥质碳酸盐岩和硅质岩为主,是盆地内主要烃源岩;下维宪阶碎屑岩和下二叠统碳酸盐岩是次要烃源岩[19]

2 原型盆地及岩相古地理演化

全球构造演化主要由多个威尔逊旋回构成,伴随着多个超级大陆的形成与裂解[20-21]。窦立荣等[22]从威尔逊旋回原理出发,结合全球483个沉积盆地前寒武纪以来的成盆演化历史,提出原型盆地叠加演化理论及14类原型盆地类型。本文基于该理论和盆地分类,恢复伏尔加—乌拉尔盆地地质历史时期原型盆地及其演化。
东欧地台形成于18亿年前,基底绝大部分形成于里菲纪末,由高度变质和强烈变形的结晶岩系组成。东欧地台东邻乌拉尔山脉,西至欧洲中部,南达高加索和克里米亚,北至巴伦支海,由多个古老板块碰撞拼合而成,整个范围呈不规则的五边形(图3)。伏尔加—乌拉尔盆地与北侧的蒂曼—伯朝拉盆地位于乌拉尔造山带西侧,与南侧的滨里海盆地一起构成了东欧地台东缘。基于整体性考虑,本文结合现今海陆位置,把伏尔加—乌拉尔盆地的原型盆地演化过程(表1图4)置于东欧地台演化背景基础之上。
图3 东欧克拉通及其周边主要构造单元(据文献[19])

Fig. 3 Main tectonic units in the Eastern European Craton and its periphery (cited from reference [19])

表1 伏尔加—乌拉尔盆地构造演化阶段与原型盆地类型

Table 1 Stages of tectonic evolution and prototype basins of Volga-Urals Basin

序号 地质时代 构造演化阶段 原型盆地类型/阶段
1 前寒武纪之前 平稳期 地台(内含地堑)
2 前寒武纪
(里菲纪—文德纪)
伸展拉张 裂谷期
3 加里东期
(寒武纪—早泥盆世)
伸展拉张 裂谷期—
被动陆缘过渡期
4 中泥盆世—
石炭纪杜内期
伸展拉张 被动陆缘
5 石炭纪维宪期—
中石炭世
挤压碰撞 弧后坳陷
6 晚石炭世—
晚二叠世
挤压碰撞 弧后前陆
图4 过东欧地台的沉积盖层原型盆地演化剖面图(据文献[19]修编,剖面位置见图5g

Fig. 4 Evolutionary profiles of the prototype sedimentary basin crossing Eastern European Platform (cited from reference [19], revised; location is shown in Fig. 5g)

伏尔加—乌拉尔盆地经历伸展拉张、挤压碰撞构造演化阶段,依次发育陆内裂谷、被动大陆边缘、弧后坳陷、弧后前陆4种原型盆地类型。盆地全面发育始于中晚泥盆世东欧克拉通东缘和东南缘裂谷作用时期,并在被动大陆边缘和弧后坳陷环境下发育多期海侵—海退沉积旋回,形成多套储盖组合。中石炭世—二叠纪期间,随着乌拉尔洋关闭和碰撞造山,活动边缘演变为前陆盆地,被来自造山带的碎屑沉积物快速堆积充填。

2.1 伸展拉张阶段

2.1.1 里菲纪—文德纪

伴随着原始地壳的克拉通化,在古元古代出现了最早的稳定构造单元。里菲纪早中期,古乌拉尔洋逐渐张开,地幔深部物质上涌形成热点,东欧地台经历了至少三期裂谷作用,影响到了大部分地区。东部的伏尔加—乌拉尔盆地及周缘海槽局部形成了一系列南北向、北东—南西向和北西—南东向的地堑,充填了巨厚的火山碎屑岩,最厚可超过10 000 m。
里菲纪晚期—文德纪时期,随着裂谷体系的不断蔓延,东欧地台边缘形成了古乌拉尔洋的被动陆缘碳酸盐台地。在边缘地堑沉积了大量碳酸盐岩夹碎屑岩;在一些碳酸盐台地近陆一侧形成了大量叠层石富集的生物礁白云岩,厚度可达 2 000 m;靠近海域的局限盆地则整体下陷,随着海水的不断注入逐渐沉积了陆相碎屑岩—海相碎屑岩序列[23]

2.1.2 加里东期(寒武纪—早泥盆世)

在加里东运动影响下,东欧地台整体隆升。早寒武世晚期古乌拉尔洋关闭,引起大范围海退,波罗的坳陷等陆内克拉通盆地沉积了三角洲—陆相碎屑岩。早奥陶世,东欧地台东缘解体,乌拉尔洋再度开启,环绕古陆发育被动大陆边缘滨浅海(图5a),裂谷活动发育,主体发育海相碎屑岩。该时期伏尔加—乌拉尔盆地范围主体处于剥蚀区,沉积局限于东北缘,主要发育浅海碎屑岩,局部隆起区发育白云石化藻叠层生物礁。早泥盆世,东欧地台东缘处于强烈的伸展拉张作用背景下,主体以滨浅海碎屑岩发育为特征;伏尔加—乌拉尔盆地中部和东部沉积了浅海相砾岩、砂岩和粉砂岩(图6a)。
图5 伏尔加—乌拉尔盆地及周缘原型盆地演化平面图

Fig. 5 Evolutionary plan of prototype basin of Volga-Urals Basin and its periphery

图6 伏尔加—乌拉尔盆地泥盆纪—二叠纪岩相古地理图

Fig. 6 Devonian-Permian lithofacies paleogeography of Volga-Urals Basin

2.1.3 被动大陆边缘 (中泥盆世—石炭纪杜内期)

中泥盆世吉维特期—晚泥盆世早弗拉期,在持续的拉张伸展作用下,海水覆盖整个地台区,广泛沉积滨岸平原相—浅海相碎屑岩(图5b)。伏尔加—乌拉尔盆地以浅海碳酸盐岩和页岩发育为主(图6b)。早—中泥盆世发育的厚层滨浅海相碎屑岩具有明显沉积旋回,底部为粒度较粗的碎屑岩,顶部为碳酸盐岩,形成一套重要储层(图1b)。
中弗拉期后,随着部分微板块从东欧地台逐渐分离,区域伸展作用广泛发育并伴随大范围海侵,浅海—半深海分布较广(图5c)。晚泥盆世伏尔加—乌拉尔盆地发育大规模的富含有机质的浅海—半深海碳酸盐岩(泥灰岩)和硅质页岩等,称为多玛尼克相沉积(图6c),为盆地的主要烃源岩,其分布范围由早期的卡马—基涅尔坳陷系(维西姆坳陷—布祖卢克坳陷近NE向延展的条带)扩展到盆地北部、东南部等大部分地区[24-25]。前人对别尔斯克坳陷与南鞑靼隆起周边区域的深度域地震剖面进行解释,构建了多玛尼克相沉积的薄层模型,精细刻画其空间分布和结构特征(图7) [26-27]
图7 伏尔加—乌拉尔盆地上泥盆统至下石炭统碳酸盐沉积相地震解释剖面(据文献[27];剖面位置见图1a)

Fig. 7 Seismic interpretation profile of carbonate sedimentary facies of Upper Devonian-Early Carboniferous in Volga-Urals Basin (cited from reference [27]; location is shown in Fig. 1b)

晚弗拉期,乌拉尔洋早期的火山弧及其蛇绿岩基底向东欧地台边缘下方俯冲,在俯冲地带以东形成了新的岛弧和边缘海盆地。从法门期到早石炭世杜内期,盆地内碳酸盐沉积作用持续加强,而多玛尼克相的分布面积大幅缩减[24]

2.2 挤压碰撞阶段

2.2.1 弧后坳陷期(石炭纪维宪期—中石炭世)

早石炭世维宪期,哈萨克斯坦古陆与东欧古陆逐渐会聚并开始碰撞,碰撞造成的抬升引起大范围海退,半深海分布区大幅度收缩(图5d)。伏尔加—乌拉尔盆地内西部发育浅海相碎屑岩和三角洲相石英砂岩、泥岩;东部发育浅海相碳酸盐岩,以泥质碳酸盐岩为主(图6d)。中晚维宪期—中石炭世巴什基尔期,在广泛的海侵作用影响下,东欧地台西部沉积了海相、陆相碎屑岩和煤层,在岛弧周围形成了前积型碎屑岩扇体,低洼地区沉积了盆地相页岩,并被巨厚的碎屑岩充填。在伏尔加—乌拉尔盆地东南部,巴什基尔阶普遍发育复理石建造,最大厚度达到2 000 m。

2.2.2 弧后前陆盆地(晚石炭世—晚二叠世)

晚石炭世莫斯科期,东欧古陆与哈萨克斯坦古陆之间的乌拉尔洋洋壳完全消减,古陆之间继续碰撞,东西向挤压作用和西向逆冲作用导致乌拉尔山脉强烈抬升和地壳构造负荷增大,乌拉尔山脉西侧的伏尔加—乌拉尔盆地逐渐演变成为前陆盆地(图5e)。在持续的挤压应力和逆冲构造荷载作用影响下,盆地被动大陆边缘层序发生褶皱。在持续压陷作用下,东欧地台再次发生海侵,沉积了大量的砂岩和页岩;随着海侵范围的扩大,海相碳酸盐岩与灰色页岩呈互层发育。晚石炭世早期伏尔加—乌拉尔盆地西部主要发育深海相泥岩和碳酸盐岩,东部发育滨浅海碎屑岩(图6e);晚石炭世晚期盆地大面积发育海相碳酸盐岩,以石灰岩、白云岩互层为主(图6f[28]
早二叠世,随着挤压作用逐渐增强,乌拉尔造山带隆升,在东欧地台西部的古陆发育区域不整合,地台东缘水体逐渐变浅,整体仍以海洋环境为主(图5f),东部乌拉尔前渊沉积了厚层砾岩、砂岩和页岩。在快速海退背景下,伏尔加—乌拉尔盆地东缘发育厚层灰色磨拉石建造,由浅水碳酸盐岩向西过渡到硬石膏等蒸发岩(图6g)。在南侧的滨里海盆地和乌拉尔前渊南部堆积了巨厚的盐岩。
晚二叠世挤压作用继续加强,进入乌拉尔造山运动最强烈的阶段,发生大面积海退(图5g),沃德期主要发育石灰岩、白云岩和少量石膏,乌拉尔前渊大部分被碎屑岩覆盖,长兴期末以陆相环境为主。伏尔加—乌拉尔盆地内靠近乌拉尔山的东北部地区发育碎屑岩,西部发育浅海蒸发岩(图6h)。
二叠纪末,随着碰撞作用的进一步加剧,整个东欧地台继续隆升,开始了漫长的风化、淋滤和剥蚀作用过程。三叠纪,碰撞作用的影响仍在加剧,范围扩大到乌拉尔前渊带北部地区,伏尔加—乌拉尔盆地和滨里海盆地发育少量三叠系(图2)。

3 烃源岩与成藏组合

伏尔加—乌拉尔盆地发育3套烃源岩(图1b):泥盆系多玛尼克海相烃源岩为主要烃源岩;石炭系维宪阶和下二叠统碳酸盐岩规模较小,为次要烃源岩。多玛尼克相烃源岩岩性主要是页岩、泥灰岩和碳酸盐岩,黏土矿物含量范围为5.82%~13.90%,沥青含量约为18.70%,硅质含量大于30%,脆性指数平均为0.90[29]。这套烃源岩的TOC为0.5%~23.3%,大部分大于2%;镜质组反射率(Ro)主体介于0.5%~1.2%;有机质类型以Ⅱ型为主(图8),含少量Ⅰ型和Ⅲ型,以生油为主,南部靠近滨里海地区有少量生气。多玛尼克相烃源岩主要分布在卡马—基涅尔坳陷系(图6c),特别是穆哈诺沃—埃罗霍夫凹陷等深部负向构造单元内,厚度大、有机质富集、裂缝发育,发育异常高压,是页岩油等非常规油气勘探的有利区[30]
图8 伏尔加—乌拉尔盆地多玛尼克相烃源岩HI-Tmax关系图(数据引自文献[31])

Fig. 8 HI-Tmax diagram of Domanic source rocks in Volga-Urals Basin (data cited from reference [31])

在伏尔加—乌拉尔盆地新元古界—古生界共划分出4套成藏组合(图1b):里菲系—上泥盆统弗拉阶、上泥盆统法门阶—下石炭统杜内阶、下石炭统维宪阶—中石炭统巴什基尔阶、上石炭统莫斯科阶—下二叠统空谷阶。按照目前已发现大型油气田的油气资源量 [17] 统计,下石炭统—中石炭统、上石炭统—下二叠统分别为赋存石油、天然气最多的成藏组合(图9),占比分别为48%和62%。对不同成藏组合中油气富集特征的系统研究表明,常规油气主要分布在盆地中北部的隆起区及其周缘坳陷,以及西南端的背斜带等区域,未来可重点关注喀山—上卡马坳陷的高部位区,关注泥盆系—石炭系和二叠系等重点层系。
图9 伏尔加—乌拉尔盆地各成藏组合已发现油气储量分布直方图

Fig. 9 Histogram of discovered oil and gas reserves in each play of Volga-Urals Basin

4 结论

(1)伏尔加—乌拉尔盆地先后经历伸展拉张、挤压碰撞构造演化阶段,发育陆内裂谷、被动大陆边缘、弧后坳陷、弧后前陆4个原型盆地类型/阶段。盆地伸展拉张阶段主要发育裂谷和被动大陆边缘,挤压碰撞阶段主要发育弧后坳陷和弧后前陆盆地。
(2)中—新元古代盆地整体稳定,沉积作用局限于东部,以陆相碎屑岩为主;早奥陶世乌拉尔洋开启,东欧地台发生海侵,以浅海碳酸盐岩发育为主;泥盆纪开始,盆地经历多期海退—海侵过程;二叠纪末,盆地全面抬升,遭受剥蚀。
(3)盆地发育4套成藏组合,多玛尼克相烃源岩为主要烃源岩,海侵阶段的海陆过渡相和滨浅海相为盆内两套重要的油气储层,喀山—上卡马坳陷的正向构造带是常规油气的勘探新领域,穆哈诺沃—埃罗霍夫凹陷等深部负向构造单元烃源岩集中发育,为页岩油等非常规油气的重点有利区。
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