东秦岭—大别造山带及两侧晚古生代构造环境与油气意义

黄泽光; 方成名; 杨潇; 高长林

doi:10.11781/sysydz200902142

东秦岭—大别造山带及两侧晚古生代构造环境与油气意义

doi: 10.11781/sysydz200902142

中国石油化工股份有限公司, 石油勘探开发研究院, 无锡石油地质研究所, 江苏, 无锡, 214151

基金项目: 全国油气资源战略选区调查与评价项目(XQ-2007-02)

详细信息

作者简介:
黄泽光(1965- ),男,博士后,高级工程师,从事盆地分析和油气地质勘探研究.E-mail:huangzg@pepris.com.

中图分类号: TE121.1
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出版历程
- 收稿日期: 2008-12-07
- 修回日期: 2009-02-27
- 刊出日期: 2009-04-28

LATE PALEOZOIC TECTONICS ENVIRONMENT AND HYDROCARBON SIGNIFICANCE OF EAST QINLING-DABIE OROGENIC BELT AND ITS BOTH SIDES

Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214151, China

摘要

摘要: 通过对秦岭—大别造山带及两侧火山岩地球化学分析认为,略阳庄科和大西洋中脊的岩石可归为一类,其特征是K₂O/SiO₂比值低,TiO₂/SiO₂比值高,其∑REE值低,稀土模式平缓,不富集轻稀土,介于大陆和大洋拉斑玄武岩之间;略阳三岔子、石泉两河和日本岛弧地区的岩石其特征是K2O/SiO₂比值高,TiO₂/SiO₂比值低,其∑REE值高,稀土模式为陡右倾,富轻稀土.综合研究认为晚古生代西秦岭(勉略—阿尼玛卿—索托湖—麻扎)为古特提斯大洋环境,往东经镇巴—城口—青峰—襄樊—周家湾—广济为坳拉槽特征.同时期造山带南侧主要受古特提斯洋的影响处于海相沉积的伸展环境;北侧处于隆起状态下的陆内坳陷沉积.南侧二叠系碳酸盐岩、泥页岩及煤系是主要烃源岩,以生气为主;北侧石炭—二叠系煤系地层是主力烃源岩,晚燕山—喜山期二次生烃具有重要的油气意义.
- 地球化学特征 /
- 火山岩 /
- 构造环境 /
- 盆地原型 /
- 晚古生代 /
- 油气远景 /
- 东秦岭—大别造山带
Abstract: On the basis of geochemical analysis for volcanic rocks from East Qinling-Dabie Orogenic Belt and its both sides: Zhuangke of Lüyang County and mid-Atlantic ridge can be classified as the same type of rocks characterized by low ratio of K₂O/SiO₂,high ratio of TiO₂/SiO₂,low value of ΣREE,with flat REE pattern and not enriched LREE,which are between the continental and the oceanic tholeiite.The rock characteristics from Sanchazi of Lüeyang County,Lianghe of Shiquan County and the Japanese island arc are high ratio of K₂O/SiO₂,low ratio of TiO₂/SiO₂,high value of ΣREE and richment of LREE,the REE distribution pattern showed steep right-dip.This paper considers that the environment of West Qinling Mountain(Mianlüe-Animaqing-Soto Lake-Mazha)is the Paleo-Tethys Ocean in the Late Paleozoic,the east area(passed by the Zhenba-Chengkou-Qingfeng-Xiangfan-Zhoujiawan-Guangji)is aulacogen sediments.The south side of Qinling-Dabie Orogenic Belt is mainly in the extended environment affected by Paleo-Tethys Ocean which main hydrocarbon source rocks are Permian carbonate,shale and coal,and enriched gas.While the north side is in a state of intracontinental depression accompanying the uplifting,and the Carboniferous-Permian coal-bearing strata are the main hydrocarbon source rocks,secondary hydrocarbon generation in Late Yanshanian-Himalayan has important significance for oil and gas accumulation.
- geochemical characteristics /
- volcanic rock /
- tectonic environment /
- basin prototype /
- Late Paleozoic /
- hydrocarbon potential /
- East Qinling-Dabie Orogenic Belt

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