鄂尔多斯盆地长7油层组沉积水体及古气候特征研究  

Study of Character on Sedimentary Water and Palaeoclimate for Chang7 Oil Layer in Ordos Basin

作　　者：张才利[1,2] 高阿龙[3] 刘哲[4] 黄静[1,2] 杨亚娟[1,2] 张艳[1,2] 

机构地区：[1]中国石油长庆油田分公司勘探开发研究院,陕西西安710021 [2]低渗透油气田勘探开发国家工程实验室,陕西西安710021 [3]中国石油长庆油田分公司第三采油厂,宁夏银川750006 [4]中国石油长庆油田分公司勘探部,陕西西安710021

出　　处：《天然气地球科学》2011年第4期582-587,共6页Natural Gas Geoscience

基　　金：中国石油天然气股份有限公司石油与天然气预探科技攻关项目(编号:2008D-0703-01)资助

摘　　要：以Sr含量、Sr／Ba值和Th／U值等地球化学指标及生物遗迹化石作为判识标志，对鄂尔多斯盆地延长组长7油层组沉积环境水介质条件与古气候进行了分析：结果表明长7油层组沉积期古水介质Sr／Ba值为0．19～0．65、Th／U值为0．36～5．03，属陆相淡水环境；V／Ni值为1．75～5．53，属于还原环境；通过元素组合及生物遗迹化石、钴元素定量计算显示水体深度介于半深湖一深湖之间，最大古水深为50～120m；孢粉组合分析古气候属较温暖潮湿气候。Based on Sr concentration,the ratios of Sr/Br and Th/U,and biogliph fossil,we discuss the water condition and paleoclimate for the deposition of Chang7 oil layer in the Ordos basin. The results show that the ratio of Sr/Br and Th/U is from 0.19 to 0.65 ,and 0.36 to 5.03 ,respectively,indicating the water during the Chang7 Period was continental freshwater. The V/Ni ratio of 1.75-5. 53 is fallen into the score of the reducing environment. The element assemblage, biogliph fossil, and Co quantitative match indicate that the water depth at the Chang7 Period was half-deep to deep lake,with the maximum depth of 50-120m. The paleoclimate was confirmed as warm and humid climate by sporopollen assemblage.

关 键 词：古盐度 古水深 古气候 长7油层组 鄂尔多斯盆地 

分 类 号：TE121.31[石油与天然气工程—油气勘探]