鄂尔多斯盆地三叠系延长组砂岩的碱性溶蚀作用

田建锋; 刘池洋; 王桂成; 邱欣卫

doi:10.3799/dqkx.2011.011

鄂尔多斯盆地三叠系延长组砂岩的碱性溶蚀作用

doi: 10.3799/dqkx.2011.011

田建锋^{1, 2, 3,},
刘池洋^{1, 2},
王桂成³,
邱欣卫^{1, 2}

1.
西北大学大陆动力学国家重点实验室, 陕西西安 710069
2.
西北大学含油气盆地研究所, 陕西西安 710069
3.
西安石油大学油气资源学院, 陕西西安 710065

基金项目:

国家重点基础研究发展计划“973”项目 2003CB214607

国家自然科学基金项目 40372096

详细信息

作者简介:
田建锋(1980-), 男, 讲师, 主要从事碎屑岩储层地质学研究和教学工作.E-mail: tjf21991@163.com

中图分类号: P618
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- 被引次数: 0
出版历程
- 收稿日期: 2010-06-10
- 刊出日期: 2011-01-01

Alkaline Dissolution of Sandstone in the Triassic Yanchang Formation in the Ordos Basin

TIAN Jian-feng^{1, 2, 3
,},
LIU Chi-yang^{1, 2},
WANG Gui-cheng³,
QIU Xin-wei^{1, 2}

1.
State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, China
2.
Institute of Oil and Gas of Northwest University, Xi'an 710069, China
3.
College of Oil & Gas Resources, Xi'an Shiyou University, Xi'an 710065, China

摘要

摘要: 为弄清鄂尔多斯盆地延长组砂岩储层孔隙度与富铁绿泥石胶结的关系, 运用铸体薄片、扫描电镜、电子探针等技术分析了砂岩的孔隙特征、岩石组分特征及孔隙与岩石组分的关系, 认为绿泥石包膜对孔隙的保护作用有限, 火山物质(火山灰杂基和火山岩岩屑)的碱性溶蚀是孔隙发育的主要原因, 通过定量计算绿泥石的铁质来源, 认为这种火山物质属于中-基性火山岩, 在早成岩阶段A期7%~11%的中基性火山物质发生碱性溶蚀, 产生了8%的碱性溶蚀粒间孔隙, 同时生成了3%的孔隙衬里绿泥石.绿泥石胶结物的广泛分布只是指示成岩早期发生了大量的火山物质溶蚀并产生了可观的碱性溶蚀孔.
- 碱性溶蚀孔 /
- 绿泥石胶结 /
- 火山物质 /
- 延长组 /
- 石油地质
Abstract: In order to figure out the relationship between reservoir porosity and iron-rich chlorite cementation, the pore characteristic, rock constituents and relationship between pore and rock constituents of sandstone were studied by using cast thin sections, scanning electron microscope and electron microprobe techniques. The study reveals that the pore-line chlorite offers limited protection to the porosity, and the greatest contribution to the porosity is alkaline dissolution of volcanic materials. The volcanic materials (matrix and grain) belong to medium-basic volcanics through quantitative calculation of iron content in the chlorite cementation. During the early diagenetic stage, A 7%-11% medium-basic volcanics were dissolved, and this alkaine dissolution process yielded 8% secondary porosity and 3% pore-lining chlorite. The widespread chlorite cementation just indicates that abundant medium-basic volcanics were dissolved and considerable alkaline dissolution pore was generated.
- alkaline dissolution /
- chlorite cementation /
- volcanic materials /
- Yanchang Formation /
- petroleum geology

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图 1 鄂尔多斯盆地延长组砂岩微观特征

a.耿17，2 007.5 m；b.资24井，983 m；c.耿39井，2 047.06 m；d.芦10井，1 024.2 m；e.芦评9井，1 024 m；f.耿31井，2 049.82 m；g.金油12井，694.55 m；h.资12井，741.5 m

Fig. 1. The microscopic feature of sandstone in Yanchang Formation from Ordos basin

下载: 全尺寸图片幻灯片

图 2 延长组凝灰岩和斑脱岩Nb/Y-Zr/TiO₂图解(据邱欣卫, 2008)

Fig. 2. The Nb/Y-Zr/TiO₂ diagram of tuff and taylorite

下载: 全尺寸图片幻灯片

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