致密砂岩自生伊利石的成因及其对相对优质储层发育的影响——以川西地区须四段储层为例

doi:10.7623/syxb201105007

石油学报 ›› 2011, Vol. 32 ›› Issue (5): 783-790.DOI: 10.7623/syxb201105007

致密砂岩自生伊利石的成因及其对相对优质储层发育的影响——以川西地区须四段储层为例

孟万斌 1,2 吕正祥 3 冯明石 1 张世华 3 李敏 1,2 麦发海 1,2

1成都理工大学油气藏地质及开发工程国家重点实验室四川成都 610059； 2成都理工大学沉积地质研究院四川成都 610059； 3中石化西南油气分公司勘探开发研究院四川成都 610081

收稿日期:2011-03-08 修回日期:2011-06-30 出版日期:2011-09-25 发布日期:2011-11-28
通讯作者: 孟万斌
作者简介:孟万斌，男,1968年9月生，2003年获成都理工大学博士学位，现为成都理工大学副教授，主要从事沉积学、层序地层学和储层地质学的研究与教学工作。
基金资助:
国家科技重大专项（2008ZX05002-004-002）和油气藏地质及开发工程国家重点实验室项目（国重科研G9）资助。

The origin of authigenic illite in tight sandstones and its effect on the formation of relatively high-quality reservoirs: A case study on sandstones in the 4th member of Xujiahe Formation, western Sichuan Basin

MENG Wanbin 1,2 LÜ Zhengxiang 3 FENG Mingshi 1 ZHANG Shihua 3 LI Min 1,2 MAI Fahai 1,2

Received:2011-03-08 Revised:2011-06-30 Online:2011-09-25 Published:2011-11-28

摘要/Abstract

摘要：

川西地区须家河组四段为典型的致密砂岩储层，砂岩骨架颗粒中岩屑含量高而长石含量极低。自生黏土矿物主要为伊利石和高岭石，其中自生伊利石呈碎屑颗粒包膜、充填于次生粒内溶孔中的网状集合体和充填于粒间的非网状集合体3种方式产出。第一种为早期形成的蒙脱石经伊蒙混层转化而来;第二种由埋藏期钾长石的伊利石化作用形成；第三种由钾长石和早期形成的高岭石在深埋期间通过伊利石化作用形成。自生伊利石的形成对致密砂岩中相对优质储层的发育具有双重影响。它能降低储层的渗透率，影响储层质量，但颗粒包膜伊利石可以阻止石英次生加大的形成从而保护原生孔隙，埋藏成岩过程中蒙皂石-伊利石的转化反应以及钾长石和高岭石的伊利石化作用能促进钾长石的溶解形成次生孔隙。因此，自生伊利石的形成对于砂岩原生孔隙的保存和次生孔隙的发育具有积极作用，因而有利于相对优质储层的形成。

关键词: 致密砂岩, 自生伊利石, 川西地区, 须四段, 相对优质储层

Abstract:

The 4th member of Xujiahe Formation in the western Sichuan Basin is composed of typical tight sandstones that contain abundant debris but very scarce feldspar in skeleton grains. Authigenic clay minerals are dominated by illite and kaolinite, wherein authigenic illite can be divided into three principal types: grain-coatings, netted aggregates filled in secondary intragranular dissolved pores and non-netted aggregates filled in intergranular space. The first type transforms from the early-formed smectite through I/S mixed layer, the second type is derived from illitization by K-feldspar during burial metamorphism, and the third type is a product of illitization by K-feldspar and the early-formed kaolinite during deep burial. The formation of authigenic illite has a dual effect on the development of relatively high-quality reservoirs in tight sandstones. On the one hand, it can reduce sandstone permeability and lower the quality of reservoirs, and on the other hand, the grain-coaling illite can preserve the primary porosity by preventing quartz from cementation, while the transformation of smectite to illite and the illitization of K-feldspar and kaolinite during burial diagenesis can accelerate the dissolution of K-feldspar to form secondary pores. Therefore, the formation of authigenic illite generally plays a positive role in the primary porosity preservation and the development of secondary pores of sandstones, and consequently favors the formation of relatively high-quality reservoirs.

Key words: tight sandstone, authigenic illite, western Sichuan Basin, the 4th member of Xujiahe Formation, relatively high-quality reservoir

孟万斌吕正祥冯明石张世华李敏麦发海. 致密砂岩自生伊利石的成因及其对相对优质储层发育的影响——以川西地区须四段储层为例[J]. 石油学报, 2011, 32(5): 783-790.

MENG Wanbin Lü Zhengxiang FENG Mingshi ZHANG Shihua LI Min MAI Fahai. The origin of authigenic illite in tight sandstones and its effect on the formation of relatively high-quality reservoirs: A case study on sandstones in the 4th member of Xujiahe Formation, western Sichuan Basin[J]. Editorial office of ACTA PETROLEI SINICA, 2011, 32(5): 783-790.

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致密砂岩自生伊利石的成因及其对相对优质储层发育的影响——以川西地区须四段储层为例

The origin of authigenic illite in tight sandstones and its effect on the formation of relatively high-quality reservoirs: A case study on sandstones in the 4th member of Xujiahe Formation, western Sichuan Basin

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