收稿日期: 2009-07-09
修回日期: 2009-12-21
网络出版日期: 2010-06-10
基金资助
国家重点基础研究发展规划(“973”)项目(编号:2007CB209503;2008ZX05007-002)资助.
Pore Structure Features of Sandstone Reservoirs in the Upper Triassic Xujiahe Formation in the Central Part of Sichuan Basin
Received date: 2009-07-09
Revised date: 2009-12-21
Online published: 2010-06-10
碎屑岩储层的孔隙特征是油气勘探开发中最重要的研究内容之一,更是气藏精细描述、储层综合评价的重要内容,通过采用铸体薄片观察、扫描电镜观察及压汞曲线分析等多种技术手段,对川中地区上三叠统须家河组储层的孔隙类型、孔隙组合及孔隙结构等方面进行了深入的研究。研究区须家河组储层孔隙类型可分为原生残余粒间孔、次生粒间溶蚀孔、粒内溶孔、铸模孔、晶间孔和微裂缝6种主要孔隙类型;孔隙结构可分为4种类型,即:Ⅰ类粗歪双峰式—大孔中粗喉型、Ⅱ类中歪双峰式—中孔中细喉型、Ⅲ类细歪双峰式—中小孔细喉型和Ⅳ类单峰式—小孔微细喉型,这4种孔隙类型分别对应残余原生粒间孔+粒间溶孔型、粒间溶孔+粒内溶孔型、溶孔+铸模孔型和微孔型孔隙组合类型;其中Ⅰ类粗歪双峰式和Ⅱ类中歪双峰式位于有利的峰点结构区,有利于油气的聚集,为中高产能储层孔隙结构。
谢武仁, 杨威, 杨光, 杨玉凤, 谢增业, 金惠, 朱秋影, 沈珏红 . 川中地区上三叠统须家河组砂岩储层孔隙结构特征[J]. 天然气地球科学, 2010 , 21(3) : 435 -440 . DOI: 10.11764/j.issn.1672-1926.2010.03.435
The pore texture feature in clastic reservoir is not only a hot topic of the oil and gas exploration and development, but also an important task of fine description of gas reservoir and comprehensive reservoir evaluation. By technical tools such as cast thin section, scanning electron microscope, cast image analysis, high-pressure mercury injection and constant velocity mercury injection, etc, we discussed the pore types, pore combinations and pore textures in the upper Triassic Xujiahe Formation clastic reservoirs in the central part of Sichuan basin. There are six kinds of pores, i.e. remainder intergranular pore, dissolved pores between grains, dissolved pores in grains, mould pore, intracrystalline pore and micro-fissure. The pore structure can be classified for types, such as Ⅰ type of bold skewness double peaking\|large pore with medium-large throat, Ⅱ type of middle skewness double peaking-middle pore with small-middle throat, Ⅲ type of gentle skewness double peaking-small-middle pore with small throat, and Ⅳ type of single peak\small pore with micro throat. The four types of pore structure corresponded to remainder intergranular pore-dissolved pores between grains type, dissolved pores between grains-dissolved pores in grains type, dissolved pores in grains-mould pore type, and microporetype, respectively. Ⅰ and Ⅱ types located in the favorable structure area as middle-high producing petroleum layer are beneficially accumulated for the oil and gas.
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