四川盆地开江地区WT1井震旦系陡山沱组物源分析及构造背景判断<sup>&#x0002A;</sup>

doi:10.7605/gdlxb.2021.04.045

古地理学报 ›› 2021, Vol. 23 ›› Issue (4): 683-702. doi: 10.7605/gdlxb.2021.04.045

四川盆地开江地区WT1井震旦系陡山沱组物源分析及构造背景判断^*

和源¹, 文龙¹, 罗冰¹, 周刚¹, 王启宇², 李堃宇¹, 贾敏¹, 陈友莲¹, 白晓亮¹

1 中国石油西南油气田分公司勘探开发研究院,四川成都 610041;
2 中国地质调查局成都地质调查中心,四川成都 610081

收稿日期:2020-08-10 修回日期:2021-01-14 出版日期:2021-08-01 发布日期:2021-07-22
通讯作者: 罗冰,男,1982年生,博士,高级工程师,主要从事沉积储集层方面的石油地质研究工作。E-mail: lb2001@petrochina.com.cn。
作者简介:和源,男,1991年生,硕士,主要从事石油地质综合研究工作。E-mail: heyuan2017@petrochina.com.cn。
基金资助:
*国家科技重大专项课题(编号: 2016ZX05004-005)与中国石油西南油气田分公司科技项目(编号: 20200301-06)联合资助

Source and tectonic background analysis of the Sinian Doushangtuo Formation in Well WT1 in Kaijiang area,Sichuan Basin

He Yuan¹, Wen Long¹, Luo Bing¹, Zhou Gang¹, Wang Qi-Yu², Li Kun-Yu¹, Jia Min¹, Chen You-Lian¹, Bai Xiao-Liang¹

1 Exploration and Development Research Institute,PetroChina Southwest Oil & Gas Field Company,Chengdu 610041,China;
2 Chengdu Center of China Geological Survey,Chengdu 610081,China

Received:2020-08-10 Revised:2021-01-14 Online:2021-08-01 Published:2021-07-22
Contact: Luo Bing,born in 1982,doctor,senior engineer,is mainly engaged in petroleum geology research of sedimentary reservoirs. E-mail: lb2001@petroChina.com.cn.
About author:He Yuan,born in 1991,master,is mainly engaged in the comprehensive research of petroleum geology. E-mail: heyuan2017@petrochina.com.cn.
Supported by:
Co-funded by the National Science and Technology Major Project of China(No. 2016ZX05004-005)and the Science and Technology Project of PetroChina Southwest Oil & Gas Field Company(No. 20200301-06)

摘要/Abstract

摘要： 为厘清四川盆地开江地区WT1井震旦系陡山沱组地层发育的构造背景,重塑其原型沉积盆地,为重建古地理及油气进一步勘探部署工作提供科学依据,利用岩石学、岩石地球化学及碎屑锆石U-Pb年代学手段对该井陡山沱组物源进行了分析。岩石地化结果表明WT1井陡山沱组沉积物源岩为中基性火山岩类且经历了中等程度化学风化作用;碎屑锆石U-Pb年龄主要记录了915~850Ma、794~714.5Ma以及622~700Ma 3个阶段的构造岩浆活动,与扬子克拉通北缘及邻区Rodinia超大陆的裂解演化过程有关,该构造活动背景下的中基性火山岩是WT1井陡山沱组沉积的主要物质来源。结果表明四川盆地开江地区的陡山沱组发育于拉张伸展构造背景,属克拉通内裂陷盆地沉积,有利于烃源岩层的发育;同时为Rodinia超大陆的裂解演化过程提供了重要的年代学演化证据。该成果对深入认识四川盆地的地质结构、沉积-构造演化以及油气勘探的战略部署等具有极为重要的科学意义。

关键词: 碎屑锆石U-Pb年代学, 物源分析, 构造背景, 陡山沱组, WT1井, 开江地区, 四川盆地

Abstract: The clarification of the geologic tectonic background of the Doushantuo Formation in Well WT1 in Kaijiang area,Sichuan Basin,and reconstruction of its archetypal sedimentary basin,will provide scientific basis for the palaeogeography reconstruction and the further exploration and development of oil and gas. Petrology,petrogeochemistry and U-Pb geochronology of detrital zircons were used to analyze the provenance of Doushantuo Formation. The petrogeochemical results show the source rocks of Doushantuo Formation in Well WT1 are intermediate-basic volcanic rocks and have undergone moderate chemical weathering. The detrital zircon U-Pb ages mainly record three stages of tectonic magmatic activity,including 915-850Ma,794-714.5Ma and 622-700Ma,which are mainly related to the disintegration and evolution of the Rodinia supercontinent in the northern margin of Yangtze Craton and its adjacent area. The intermediate-basic volcanic rocks in this tectonic background are the main source of the Doushantuo Formation deposition in Well WT1. The results show that the Doushantuo Formation in Kaijiang area of Sichuan Basin is developed in the extensional tectonic setting and belongs to the craton inner rifting basin deposits,which is favorable for the development of hydrocarbon source rocks. At the same time,this work provides important chronologic evidence for the break up evolution of the Rodinia supercontinent. This study is of great scientific significance in understanding of the geological structure,tectono-sedimentary evolution and the strategic development of oil and gas exploration in the Sichuan Basin.

Key words: detrital zircon U-Pb geochronology, provenance analysis, tectonic setting, Doushangtuo Formation, Well WT1, Kaijiang area, Sichuan Basin

中图分类号:

P595

和源, 文龙, 罗冰, 周刚, 王启宇, 李堃宇, 贾敏, 陈友莲, 白晓亮. 四川盆地开江地区WT1井震旦系陡山沱组物源分析及构造背景判断^*[J]. 古地理学报, 2021, 23(4): 683-702.

He Yuan, Wen Long, Luo Bing, Zhou Gang, Wang Qi-Yu, Li Kun-Yu, Jia Min, Chen You-Lian, Bai Xiao-Liang. Source and tectonic background analysis of the Sinian Doushangtuo Formation in Well WT1 in Kaijiang area,Sichuan Basin[J]. JOPC, 2021, 23(4): 683-702.

http://www.gdlxb.cn/CN/Y2021/V23/I4/683

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四川盆地开江地区WT1井震旦系陡山沱组物源分析及构造背景判断^*

Source and tectonic background analysis of the Sinian Doushangtuo Formation in Well WT1 in Kaijiang area,Sichuan Basin

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四川盆地开江地区WT1井震旦系陡山沱组物源分析及构造背景判断*

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四川盆地开江地区WT1井震旦系陡山沱组物源分析及构造背景判断^*