碎屑岩储层中自生绿泥石衬边能抑制石英次生加大吗?——以四川盆地须家河组砂岩储层为例

doi:10.7623/syxb2013S1015

石油学报 ›› 2013, Vol. 34 ›› Issue (增刊一): 128-135.DOI: 10.7623/syxb2013S1015

碎屑岩储层中自生绿泥石衬边能抑制石英次生加大吗?——以四川盆地须家河组砂岩储层为例

杨威, 魏国齐, 赵杏媛, 谢武仁, 金惠, 沈珏红

中国石油勘探开发研究院廊坊分院河北廊坊 065007

收稿日期:2013-02-24 修回日期:2013-07-01 出版日期:2013-09-25 发布日期:2013-09-15
通讯作者: 杨威
作者简介:杨威,男,1971年10月生,1995年获江汉石油学院学士学位,2005年获中国地质大学(北京)博士学位,现为中国石油勘探开发研究院廊坊分院高级工程师,主要从事沉积储层和天然气地质研究工作。Email:yangw69@petrochina.com.cn
基金资助:
国家重大科技专项(2011ZX05007)资助

Can authigenic pore-lining chlorite restrain quartz overgrowth in clastic reservoir? a case study of sandstone reservoir in Xujiahe Formation, Sichuan Basin

YANG Wei, WEI Guoqi, ZHAO Xingyuan, XIE Wuren, JIN Hui, SHEN Juehong

Langfang Branch, PetroChina Research Institute of Exploration and Development, Langfang 065007, China

Received:2013-02-24 Revised:2013-07-01 Online:2013-09-25 Published:2013-09-15

摘要/Abstract

摘要：

应用X射线衍射、铸体薄片、扫描电镜、能谱、微量元素等分析方法,对四川盆地须家河组395块砂岩储层样品的黏土矿物组分和含量进行了分析。结果表明,在须家河组砂岩储层中,黏土矿物主要为伊利石和绿泥石,绿泥石含量占黏土矿物总量的33% ,并与储层孔隙度、渗透率呈一定的正相关关系;自生绿泥石属于铁-镁过渡型,偏富铁,主要分布于砂岩骨架颗粒表面,以颗粒衬边形式出现,呈叶片状和针叶状;自生绿泥石形成于pH值介于7~9的碱性水介质中,而石英次生加大形成于pH值介于5~6的弱酸性水介质中。自生绿泥石与自生石英不同的共生关系是由水介质条件变化引起的,绿泥石衬边的存在并不能明显抑制石英的次生加大,自生绿泥石优先生长于孔隙空间大的砂体中。

关键词: 绿泥石衬边, 石英次生加大, 油气储层, 须家河组, 四川盆地

Abstract:

The composition and content of clay minerals in 395 rock samples from sandstone reservoir in Xujiahe Formation, Sichuan Basin are examined by a combination of X-ray diffraction, thin section casting, scanning electron microscopy, energy spectrum analysis, and trace element assays. Results show that illite and chlorite are the major clay minerals in sandstone reservoir in Xujiahe Formation. Chlorite accounts for 33% of total content of clay minerals and has a positive correlation with porosity and permeability of reservoir. The authigenic chlorite is iron-magnesium transition type, which contains abundant iron and is mainly developed on grain surface of sandstone skeleton in the form of foliated and needle-shaped lining. Authigenic chlorite is formed in alkaline aqueous solution at pH 7-9, whereas quartz overgrowth occurs in weak acidic aqueous solution at pH 5-6. Different symbiotic relationships between authigenic chlorite and quartz are resulted from variations of aqueous medium condition. The presence of authigenic pore-lining chlorite could not restrain quartz overgrowth significantly, and authigenic chlorite preferentially grows in sandbodies with macropore spaces.

Key words: pore-lining chlorite, quartz overgrowth, oil and gas reservoir, Xujiahe Formation, Sichuan Basin

中图分类号:

TE112.221

杨威, 魏国齐, 赵杏媛, 谢武仁, 金惠, 沈珏红. 碎屑岩储层中自生绿泥石衬边能抑制石英次生加大吗?——以四川盆地须家河组砂岩储层为例[J]. 石油学报, 2013, 34(增刊一): 128-135.

YANG Wei, WEI Guoqi, ZHAO Xingyuan, XIE Wuren, JIN Hui, SHEN Juehong. Can authigenic pore-lining chlorite restrain quartz overgrowth in clastic reservoir? a case study of sandstone reservoir in Xujiahe Formation, Sichuan Basin[J]. Editorial office of ACTA PETROLEI SINICA, 2013, 34(增刊一): 128-135.

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碎屑岩储层中自生绿泥石衬边能抑制石英次生加大吗?——以四川盆地须家河组砂岩储层为例

Can authigenic pore-lining chlorite restrain quartz overgrowth in clastic reservoir? a case study of sandstone reservoir in Xujiahe Formation, Sichuan Basin

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