岩性油气藏 ›› 2015, Vol. 27 ›› Issue (1): 66–73.doi: 10.3969/j.issn.1673-8926.2015.01.010

• 油气地质 • 上一篇    下一篇

江油含增地区中三叠统雷口坡组—天井山组界线沉积微相分析

刘持恒1,2,3,胡作维1,2,李 云1,2,罗 文1,2   

  1.  1. 成都理工大学 沉积地质研究院,成都 610059 ; 2. 成都理工大学 油气藏地质及开发工程国家重点实验室,成都 610059 ; 3. 成都理工大学 构造成矿成藏国土资源部重点实验室,成都 610059
  • 出版日期:2015-02-03 发布日期:2015-02-03
  • 第一作者:刘持恒( 1989- ),男,成都理工大学在读硕士研究生,研究方向为沉积学。 地址:( 610059 )四川省成都市成华区二仙桥东三路 1 号成都理工大学沉积地质研究院。 E-mail : liuchiheng@yeah.net
  • 基金资助:

    国家自然科学基金项目“川西北地区中三叠统天井山组的锶同位素地层学研究”(编号: 41102063 )与“四川江油地区下三叠统飞仙
    关组白云化流体的锶同位素示踪研究”(编号: 41372113 )和教育部博士点基金项目“川西北地区三叠系拉丁阶燧石富集层位的锶
    同位素年龄标定”(编号: 20115122120004 )联合资助

Sedimentary microfacies analysis of the Middle Triassic Leikoupo Formation-Tianjingshan Formation boundary in Hanzeng area, Jiangyou

LIU Chiheng 1,2,3, HU Zuowei 1,2, LI Yun 1,2, LUO Wen 1,2   

  1.  1. Institute of Sedimentary Geology , Chengdu University of Technology , Chengdu 610059 , China ; 2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation , Chengdu University of Technology , Chengdu 610059 , China ; 3. Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation , Ministry of Land and Resources , Chengdu University of Technology , Chengdu 610059 , China
  • Online:2015-02-03 Published:2015-02-03

摘要:

受印支运动影响,四川盆地中三叠统天井山组目前分布范围仅限于川西北地区,深入研究中三叠统雷口坡组—天井山组沉积转换过程对沉积环境演化分析具有重要意义。通过对江油含增地区雷口坡组— 天井山组界线的野外露头剖面实测及室内显微结构观察,根据其碳酸盐岩的生物组合、颗粒、填隙物类型及其结构等特征识别出 5 种微相类型,并将其划归为 4 个相带,即台地边缘浅滩相、开阔台地相、局限台地相和蒸发台地相。 由沉积相带在垂向上的变化特征可知:从中三叠世安尼期到拉丁期,江油含增地区整体呈海平面上升趋势,咸化海水逐渐被淡化。

关键词: 沉积地层, 地层不整合圈闭, 侏罗系, 萨雷布拉克, 南图尔盖盆地

Abstract:

 The distribution range of Middle Triassic Tianjingshan Formation is limited to the northwest Sichuan Basin, affected by the Indosinian movement. The in-depth study of sedimentary transformation from Leikoupou Formation to Tianjingshan Formation of Middle Triassic is of great significant to understand the sedimentary environment evolution. By measuring the field profile of the Middle Triassic Leikoupo Formation-Tianjingshan Formation boundary in Hanzeng area and observing microfacies characteristics indoor, we identified five types of microfacies according to fossil assemblages, granular characteristics, filler types and architecture features of carbonate rocks, and recognized four sedimentary facies belts, including platform-margin sand shoal, open platform, restricted platform and evaporate platform. Based on the longitudinal change characteristics of sedimentary facies belts, it is concluded that sea level in Hanzeng area presents overall rise for a long period, and salt sea desalts gradually from Anisian Age to Ladinian Age in Middle Triassic.

Key words: sedimentary sequence, stratigraphic unconformity trap, Jurassic, Sarybulak, South Turgai Basin

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