酒西盆地鸭儿峡白垩系砂(砾)岩稀土元素特征及物源分析  

Provenance analysis based on rare earth element characteristics of Cretaceous sandstone(conglomerate) in Yaerxia area, Jiuxi Basin

作　　者：张光伟[1] 潘树新[1] 魏浩元 李伟[2] 张丽萍[1] 龙礼文[1] 

机构地区：[1]中国石油勘探开发研究院西北分院,兰州730020 [2]中国石油玉门油田分公司勘探开发研究院,甘肃酒泉735019

出　　处：《岩性油气藏》2015年第6期23-29,共7页Lithologic Reservoirs

基　　金：中国石油股份有限公司重大科技专项"酒泉盆地精细勘探技术研究及目标优选"(编号:2013E-3301)资助

摘　　要：酒西盆地鸭儿峡白垩系砂(砾)岩储层发育良好,但目前针对其物源体系的认识还不清晰。以酒西盆地鸭儿峡白垩系砂(砾)岩为研究对象,分析其稀土元素的有关参数,探讨柳北和鸭儿峡砂(砾)岩的物源及地球化学特征。研究区白垩系砂(砾)岩各稀土元素质量分数小且无明显的差异,实验样品的稀土元素配分模式相同,均呈现轻稀土元素相对富集、重稀土元素相对贫乏且变化平缓的右倾模式;Eu负异常明显,物源相似,均来自上地壳;Ce/Ce*和Ceanom指数均显示酒西盆地白垩系沉积的古水介质为还原环境,这有利于油气的形成。初步认为,柳北和鸭儿峡砂(砾)岩来自于同一物源体系。The Cretaceous sandstone（conglomerate） is good reservoir in Yaerxia area, Jiuxi Basin. The research on the provenance of the sandstone（conglomerate） is seldom, which restricts the sandstone（conglomerate） reservoir exploration in this area. The Rare earth element（REE） of the Cretaceous sandstone（conglomerate） in Yaerxia is analyzed, and the provenance and geochemical behavior were discussed. The results show that the content of the REE of the sandstone（conglomerate） is low, and there are no obvious differences between the Cretaceous sandstone（conglomerate） samples.The light rare earth element content obviously enriches compared with the heavy rare earth element content, with negative Eu anomalies shown in the chondrite aerolite standard pattern. The provenances supply of the sandstone may be derived from the upper crust. The Ce/Ce＊and Ceanomindexes indicate that the palaeoenvironment of the Cretaceous in Jiuxi Basin was a reduction environment, and the environment is profitable for the oil and gas formation. There is no difference between the characteristics of Cretaceous sandstone（conglomerate） come from Liubei and Yaerxia.

关 键 词：砂(砾)岩 稀土元素 物源 白垩系 鸭儿峡地区 酒西盆地 

分 类 号：P595[天文地球—地球化学]