鄂尔多斯盆地延长组凝灰岩夹层展布特征及其地质意义

被引：92

作者：

邱欣卫

刘池洋

李元昊

毛光周

王建强

机构：

[1] 大陆动力学国家重点实验室西北大学含油气盆地研究所

来源：

沉积学报 | 2009年 / 27卷 / 06期

关键词：

鄂尔多斯盆地; 延长组; 凝灰岩夹层; 展布特征; 地质意义;

D O I：

10.14027/j.cnki.cjxb.2009.06.012

中图分类号：

P618.13 [石油、天然气];

学科分类号：

0709 ; 081803 ;

摘要：

鄂尔多斯盆地延长组凝灰岩夹层分布广泛,通过众多凝灰岩夹层的实际岩心观察,归纳总结出凝灰岩夹层的常规测井曲线表现为具有相对低电位、高自然伽马、高电阻率、高声波时差值的特征,并且高值常略低于致密泥岩段;单井分析凝灰岩夹层与上、下部岩石整合接触,较少发育同沉积构造,以典型的火山尘灰大气降落沉积产物为主,但也偶见凝灰岩与砂泥岩一起发育扰动构造,明显经受了水动力改造;连井剖面分析说明延长组长1—长9皆有凝灰岩分布,横向上可对比性凝灰岩主要有4套,分别为长91、长73底、长72、长71期,以盆地西南部长73期最发育;凝灰岩平面展布特征整体呈北西向展布,由南西—北东向凝灰岩厚度逐渐变薄,并且与烃源岩、放射性异常展布形态一致,因此认为凝灰岩的沉积作用所引起的元素迁移和古环境变化,可能对延长组优质烃源岩的发育具有重要意义。

引用

页码：1138 / 1146

页数：9

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