四川盆地下寒武统膏盐岩“多潟湖”沉积模式
- 顾志翔1,2,
- 何幼斌1,2, ,
- 彭勇民3,
- 罗进雄1,2,
- 刘小帆1,
- 张锦1,
- 聂鸿宇1
- 1. 长江大学地球科学学院, 武汉 430100;
- 2. 长江大学油气资源与勘探技术教育部重点实验室, 武汉 430100;
- 3. 中国石油化工股份有限公司石油勘探开发研究院, 北京 100083
基金项目:
国家科技重大专项（2011ZX05004-001-004）
作者简介:
顾志翔,男,1989年出生,博士研究生,沉积学,E-mail:gu_zhixiang@126.com
- 收稿日期:
2018-10-15
- 修回日期:
2018-12-11
- 刊出日期:
2019-08-10
摘要: 早寒武世晚期四川盆地构造背景为"两隆夹一凹"的格局，气候干旱炎热，为膏盐岩的发育创造了有利条件。通过野外剖面、钻井剖面、岩石薄片及区域地质调查等资料，总结了下寒武统膏盐岩发育特征。基于岩性特征、岩性组合方式及分区的不同，对水动力特征、沉积构造、膏盐岩单层厚度、发育规模及位置等方面的差异进行对比，结合岩相古地理研究，建立了四川盆地下寒武统膏盐岩沉积模式。研究结果表明：1）膏盐岩主要以含膏白云岩类和石膏岩类为主，膏盐岩厚度介于0.74~419.9 m，具有分布广、变化大等特点，沉积中心分别位于重庆-合江一带、利川-彭水一线，整体上呈现"山字型"展布特征；2）膏盐岩岩性组合类型可分为：白云岩或泥（砂）岩夹膏盐岩组合、膏盐岩与白云岩呈韵律性互层组合、膏盐岩夹白云岩或页岩组合，分别发育于潮上带、潮上带相对低洼处及潮上带-潮间带上部水体较深且循环受限的凹陷处；3）膏盐岩主要形成于川东南静水潟湖、其次为川东及川西南扰动潟湖与混积潮洼，即"一主两副"的多潟湖环境。
“Multiple-lagoon” Sedimentary Model of the Lower Cambrian Gypsum-salt Rocks in the Sichuan Basin
- GU ZhiXiang
1,2,
- HE YouBin
1,2, ,
- PENG YongMin
3,
- LUO JinXiong
1,2,
- LIU XiaoFan
1,
- ZHANG Jin
1,
- NIE HongYu
1
- 1. School of Geosciences, Yangtze University, Wuhan 430100, China;
- 2. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan 430100, China;
- 3. Petroleum Exploration and Development Research Institute, SINOPEC, Beijing 100083, China
Funds:
National Science and Technology Major Project, No. 2011ZX05004-001-004
- Received Date:
2018-10-15
- Rev Recd Date:
2018-12-11
- Publish Date:
2019-08-10
Abstract: The structural setting of the Sichuan Basin in the latter part of the Early Cambrian epoch appears as a sin-gle depression between two uplifts. The climate was hot and dry,favoring the development of gypsum-salt rocks, which characteristics were analyzed in a combination of field profile,drilling section,thin section and regional geo-logical survey. The present study of lithofacies paleogeography of gypsum-salt rocks compares the diverse hydrody-namic characteristics,sedimentary structure,single-layer thickness,development of areal scale and location,and fi-nally establishes a sedimentary model of Early Cambrian gypsum-salt rocks in the Sichuan Basin,with the following results. (1) The gypsum-salt rocks mainly comprise gypsum-bearing dolomite and gypsum rocks from 0.74 m to 419.9 m thick. The sedimentary centers are located in the Chongqing-Hejiang and Lichuan-Pengshui areas. The overall dis-tribution characteristics are "mountain type". (2) The lithological association of gypsum-salt rocks falls into three cat-egories:association of dolomite or mudstone (sand) rocks with gypsum-salt rocks,developed in the upper tidal zone;rhythmically interbedded associations of gypsum-salt rocks and dolomite in relatively shallow,low-lying areas in the upper tidal zone;and the association of gypsum-salt rocks with dolomite or shale in deeper depressions with re-stricted circulation in the upper-to inter-tidal zone. (3) In multiple-lagoons (one main lagoon and two subsidiary la-goons),the gypsum-salt rocks were formed mainly in static lagoons in southeastern Sichuan,with two subsidiary la-goons in disturbed lagoons in eastern Sichuan and in mixed tidal depressions in southwestern Sichuan.
顾志翔, 何幼斌, 彭勇民, 罗进雄, 刘小帆, 张锦, 聂鸿宇. 四川盆地下寒武统膏盐岩“多潟湖”沉积模式[J]. 沉积学报, 2019, 37(4): 834-846. doi: 10.14027/j.issn.1000-0550.2018.188
GU ZhiXiang, HE YouBin, PENG YongMin, LUO JinXiong, LIU XiaoFan, ZHANG Jin, NIE HongYu. “Multiple-lagoon” Sedimentary Model of the Lower Cambrian Gypsum-salt Rocks in the Sichuan Basin[J]. Acta Sedimentologica Sinica, 2019, 37(4): 834-846. doi: 10.14027/j.issn.1000-0550.2018.188
| Citation: |
GU ZhiXiang, HE YouBin, PENG YongMin, LUO JinXiong, LIU XiaoFan, ZHANG Jin, NIE HongYu. “Multiple-lagoon” Sedimentary Model of the Lower Cambrian Gypsum-salt Rocks in the Sichuan Basin[J]. Acta Sedimentologica Sinica, 2019, 37(4): 834-846. doi: 10.14027/j.issn.1000-0550.2018.188
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