摘要
为了获得关中盆地氦气成藏特征,通过拉曼光谱对关中盆地的华山、宝鸡和牧护关花岗岩岩体中石英裂隙的5个包裹体样品的10个点进行分析,同时结合烃类包裹体的岩石学特征,均一温度和成分分析,结果表明该区石英裂隙中发生过两次氦气充注事件。早期包裹体主要成分为CO_2和N_2,均一温度为330~370℃,晚期次生包裹体具有明显的甲烷拉曼峰的特征,有CH_4充注,均一温度为170~230℃。在7个裂变径迹数据的约束下,中新世以来关中盆地晚期次生包裹体的形成时期为氦气成藏的主要时期。
A total of 10 granitoid intrusives was analyzed from 5 samples collected from Huashan,Baoji,and Muhuguan granites in Guanzhong Basin and the composition of inclusions in the granite-quartz fissures by using Raman spectrometry to elucidate their helium-accumulation characteristics.By combining these analyses with the data on the petrological characteristics of hydrocarbon inclusions,homogenization temperature,and component analysis,it was determined that two helium-charge events occurred in the area.The early secondary inclusions mainly comprised CO 2 and N 2,and the homogenization temperature was between 330℃and 370℃.The late secondary inclusions mainly comprised CH 4,thereby exhibiting obvious characteristics of methane’s Raman peak,and their homogenization temperature was between 170℃and 230℃.In addition,the apatite fission track investigations of seven samples showed that the main helium-accumulation period was the late-secondary-inclusion formation during the Miocene epoch in the Guanzhong Basin.
作者
董敏
王宗秀
董会
马立成
张林炎
DONG Min;WANG Zong-xiu;DONG Hui;MA Li-cheng;ZHANG Lin-yan(Institute of Geomechanics,Chinese Academy of Geological Sciences, Beijing 100081,China;Key Lab of Shale Oil and Gas Geological Survey,Chinese Academy of Geological Sciences, Beijing 100081,China;Xi an Center of Geological Survey,CGS 3,Xi an 710054,China)
出处
《科学技术与工程》
北大核心
2018年第27期7-12,共6页
Science Technology and Engineering
基金
中国地质科学院地质力学研究所院所长基金(DZLXJK201608)和中国地质调查局油气地质调查项目(DD20160183)资助.
关键词
关中盆地
拉曼光谱特征
裂变径迹
氦气成藏
Guanzhong basin
Raman spectrum characteristics
the apatite fission track
helium accumulation
