甘肃省灵台县灵1井延长组碎屑岩地球化学特征及对源区构造的示踪性  

Clastic Rock Geochemical Properties and Its Trace to the Source Area Structures of Yanchang Formation in Lingtai County in Gansu Province

作　　者：张凤博[1] 杨云祥[1] 

机构地区：[1]延长油田股份有限公司下寺湾采油厂,陕西延安716100

出　　处：《西北地质》2012年第3期41-47,共7页Northwestern Geology

基　　金：长庆油田勘探开发研究院"鄂尔多斯盆地西南部地区灵1井油气地质综合评价研究"项目(技2006-123)

摘　　要：对灵1井延长组长9—长10油层组砂岩样品的岩石化学、微量元素及稀土元素特征进行了系统研究,并利用不同的常量、微量元素构造属性判别图解对灵1井区的源区构造属性进行分析和探讨,结果表明:灵1井区延长组砂岩样品稀土元素含量稳定,稀土元素配分曲线显示轻稀土明显富集、重稀土贫化的"右倾"型;利用常量和微量元素构造判别图,表明物源区构造背景主要为活动大陆边缘和大陆岛弧环境;位于泛鄂尔多斯盆地腹地的灵1井区,沉积物具有混构造源区的特点,受控于华北板块与扬子板块拼合作用下的秦岭造山带的整个演化过程,至晚三叠世,秦岭造山带成为该井区稳定的供屑区。The characteristics of petrochemistries, microelements and rare earth elements of sandstone samples from Chang9-10 members of Yanchang Formation of ling1 well are systematically studied. By using structural distinguished figures of different macroelements and microelements, the source area structural attributes of ling1 well are analyzed and discussed. The results show that： The microelement content in sandstone samples of Yanchang Formation from ling1 well area is stable; In microelement dis- tribution curves, light rare earth elements （LREE） are evidently concentrated but heavy rare earth elements （HREE） are depleted; According to the structural distinguished figures of different macroelements and microelements, the structural backgrounds of source area are mainly active continental margin and islands; The Ling1 well area is located in hinterland in Odors basin, its sediments are mixed provenance, and its evolution course is controlled by Qinling orogenis belt which results from combination Huabei plate with Yangtze plate. To late Triassic, Qinling orogenis belt became stable source area of Ling1 well.

关 键 词：常量元素 微量元素 秦岭造山带 延长组 

分 类 号：P595[天文地球—地球化学] P588.21[天文地球—地质学]