天然气地球科学

• 天然气地质学 • 上一篇    下一篇

四川盆地桐湾运动及其油气地质意义

武赛军,魏国齐,杨威,谢武仁,曾富英   

  1. 中国石油勘探开发研究院廊坊分院,河北 廊坊 065007
  • 收稿日期:2015-04-27 修回日期:2015-11-02 出版日期:2016-01-10 发布日期:2016-01-10
  • 作者简介:武赛军(1985-),男,陕西潼关人,博士研究生,主要从事构造地质研究. E-mail:wsj_8510@163.com.
  • 基金资助:

    国家科技重大专项(编号:2011ZX05007)资助.

Tongwan Movement and its geologic significances in Sichuan Basin

Wu Sai-jun,Wei Guo-qi,Yang Wei,Xie Wu-ren,Zeng Fu-ying   

  1. PetroChina Research Institute of Petroleum Exploration and Development-Langfang, Langfang 065007, China
  • Received:2015-04-27 Revised:2015-11-02 Online:2016-01-10 Published:2016-01-10

摘要:

桐湾运动作为震旦纪—早寒武世多幕构造运动逐渐受到关注,目前,对其与震旦系灯影组岩溶储层密切相关认识较为一致,然而其与震旦纪—早寒武世古构造形成关系的认识存在分歧。由于古构造与油气地质条件密切相关,因此,深入研究桐湾运动具有重要意义。通过钻井、露头、川中地区地震资料分析,结合区域地质资料,研究桐湾运动期次、运动性质、发育范围及对震旦纪—早寒武世古构造的影响。结果表明:①桐湾3幕构造运动性质为幕式整体抬升,桐湾Ⅰ幕、Ⅱ幕扬子区广泛发育,桐湾Ⅲ幕相对局限,同一幕构造运动不同地区强弱表现不同,反映局部存在差异升降;②桐湾期幕式抬升、局部差异升降,加剧隆坳格局分异,并可将四川盆地震旦纪—早寒武世构造演化划分为隆坳雏形期、隆坳分异初期、隆坳发育期、隆坳强烈分异期、隆坳形成期、隆坳调整期和隆坳填平补齐期7个阶段;③古构造高地与桐湾期幕式抬升综合作用,使得隆起区沉积的丘滩体幕式抬升暴露,有利岩溶储集层发育,桐湾期不整合面可作为震旦系古油藏以及现今气藏形成过程中油气运移的优势通道。桐湾期多幕运动对震旦纪—早寒武世构造演化、储层发育及油气运聚均有重要影响。

关键词: 桐湾运动, 震旦纪, 早寒武世, 幕式抬升, 隆坳格局, 构造演化

Abstract:

Research of Tongwan Movement gradually became popular for its multi-episode tectonics in Sinian-Early Cambrian.It arrived at a common view that the Tongwan Movement was closely related to the karst reservoirs in Dengying Formation of Sinian.However,it is still controversial on the relationship between the Tongwan Movement and Sinian-Early Cambrian paleo-tectonics.Therefore,a study on the Tongwan Movement is meaningful for its tight connection with hydrocarbon geological conditions.Based on drilling core,outcrop and seismic data in central Sichuan area and combined with geological materials,the stages,the motion of Tongwan Movement and its impact on the Sinian-Early Cambrian paleo-tectonics were studied,leading to the results as follows:(1)The 3-episode Tongwan Movement appeared episodic uplift as a whole.Tongwan Ⅰ and Ⅱ episode influenced the whole of Yangzi Plate,while the effect of Tongwan Ⅲ episode was restricted in limited areas.Even the same episode of Tongwan Movement showed different magnitudes in different areas,which reflected the existence of differential vertical motion in some areas.(2)Tongwan episodic uplifting resulted in differential elevation and subsidence,which accelerated the formation of uplift-depression patterns.The Sinian-Early Cambrian tectonic evolution of Sichuan Basin could thus be divided into 7 stages,including uplift-depression differentiation embryonic stage,uplift-depression differentiation stage,intense uplift-depression differentiation stage,uplift-depression forming stage,uplift-depression adjusting stage and uplift-depression filling-up stage.(3)The interaction of paleohighs and Tongwan episodic uplifting motivated the uplifting and exposure of sedimentary mound-beach in uplifting area,which was beneficial for the development of karst reservoirs.The unconformity of Tongwan Movement could act as dominant channels for migration of ancient oil reservoirs in Sinian and present gas reservoirs.In conclusion,Tongwan multi-episode movement has a great influence on the tectonic evolution,reservoir formation and migration and accumulation of hydrocarbon in Sinian-Early Cambrian.

Key words: Tongwan Movement, Sinian-Early Cambrian, Episodic Uplift, Uplift-depression pattern, Tectonic evolution

中图分类号: 

  • TE121.2

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