塔中顺托果勒低隆区柯坪塔格组长石溶蚀及对储层的影响

赵姗姗; 张哨楠; 万友利

doi:10.11781/sysydz201503293

塔中顺托果勒低隆区柯坪塔格组长石溶蚀及对储层的影响

doi: 10.11781/sysydz201503293

赵姗姗^1,2,
张哨楠^1,2, ,,
万友利³

1.
西南石油大学油气藏地质及开发工程国家重点实验室, 成都 610500
2. 西南石油大学地球科学与技术学院, 成都 610500
3. 中国地质调查局成都地质调查中心, 成都 610081

基金项目: 国家"十二五"重大科技专项(2011ZX05002-003)和国家自然科学基金青年基金(41302115)联合资助.

详细信息

作者简介:
赵姗姗(1988-),女,在读硕士研究生,专业方向为储层沉积学.E-mail:565978578@qq.com.

通讯作者:
张哨楠(1957-),男,博士,教授,从事石油地质学教学与研究.E-mail:zsn@cdut.edu.cn.

中图分类号: TE122.2
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出版历程
- 收稿日期: 2014-12-12
- 修回日期: 2015-03-04
- 刊出日期: 2015-05-28

Feldspar dissolution and its effect on reservoir in Kepingtage Formation, Shuntuoguole Low Uplift, central Tarim Basin

1.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China
3. Chengdu Centre, China Geological Survey, Chengdu, Sichuan 610081, China

摘要

摘要: 铸体薄片镜下观察显示,塔里木盆地顺托果勒低隆区志留系柯坪塔格组致密砂岩储层现存孔隙类型主要为残余原生粒间孔,其次为长石溶蚀所形成的次生孔隙。综合利用薄片、扫描电镜、能谱分析、X-射线衍射等分析手段,对长石溶蚀特征、溶蚀机制及对储层物性的影响进行研究。结果表明:钾长石溶蚀形成的次生孔隙比重较大,斜长石较少,而钠长石几乎未被溶蚀。泥盆纪早期—侏罗纪末期为研究区柯坪塔格组致密砂岩储层长石溶蚀形成次生孔隙的主要时期,该时期以钾长石的溶蚀为主,溶蚀形成的次生孔隙仅在未被沥青包覆的局部较为发育。溶蚀产物主要为伊利石及伊/蒙混层,虽然能在一定程度上阻碍石英次生加大,但大大降低了砂体储层孔喉间的连通性,对储层渗透率影响很大。
- 长石溶蚀 /
- 次生孔隙 /
- 致密砂岩 /
- 柯坪塔格组 /
- 顺托果勒低隆 /
- 塔里木盆地
Abstract: Thin section data showed that primary intergranular poreswere dominant in the tight sandstone reservoirs in the Silurian Kepingtage Formation in the Shuntuoguole Low Uplift of the Tarim Basin, while secondary pores formed by feldspar dissolution took the second place. The feldspar dissolution characteristics, mechanism and its effect on reservoir physical property were analyzed using thin sections, scanning electron microscopy (SEM), energy spectrum and X-ray diffraction (XRD). The proportion of secondary porosity formed by potassium feldspar dissolution was much larger than that from plagioclase, and albite was almost not dissolved. From the early Devonian to the late Jurassic, potassium feldspar dissolution resulted in the formation of secondary porosity, and the secondary pores only developed in the area not covered by asphalt. Dissolution products were mainly illite and the mixture of illite/smectite, although they could hinder secondary quartz overgrowth to some extent, greatly reduce connectivity among the pore throats of the sand body reservoir, and greatly influence the reservoir permeability.
- feldspar dissolution /
- secondary pore /
- tight sandstone /
- Kepingtage Formation /
- Shuntuoguole Low Uplift /
- Tarim Basin

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