四川盆地龙马溪组页岩中碳酸盐矿物特征及对储集性能的影响

郭芪恒, 金振奎, 耿一凯, 赵建华, 常睿, 崔学敏, 王金艺

doi:10.11764/j.issn.1672-1926.2018.12.002

天然气地球科学 >

2019 , Vol. 30 >Issue 5: 616 - 625

DOI: https://doi.org/10.11764/j.issn.1672-1926.2018.12.002

非常规天然气

四川盆地龙马溪组页岩中碳酸盐矿物特征及对储集性能的影响

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1.中国石油大学(北京)地球科学学院，北京 102249；
2.大庆油田有限责任公司第三采油厂，黑龙江大庆 163000；
3.中国石油大学(华东)地球科学与技术学院，山东青岛 266580

郭芪恒(1994-)，男，甘肃庆阳人，硕士研究生，主要从事沉积学与非常规油气地质研究.E-mail：1974735970@qq.com.

收稿日期: 2018-10-15

修回日期: 2018-12-02

网络出版日期: 2019-05-29

基金资助

国家自然科学基金(编号：41802141)资助.

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The characteristics of carbonate minerals in the Longmaxi Formationgas shale and its impact on the reservoir performance in the Sichuan Basin

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1.College of Geosciencess,China University of Petroleum,Beijing 102249,China;
2.No.3 Oil Production Plant,PetroChina Daqing Oilfield Company,Daqing 163000,China;
3.School of Geosciences,China University of Petroleum(East China),Qingdao 266580,China

Received date: 2018-10-15

Revised date: 2018-12-02

Online published: 2019-05-29

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摘要

为了分析页岩气储层中碳酸盐矿物特征及其对页岩储集性能的影响，以四川盆地龙马溪组页岩为研究对象，利用X-射线衍射、扫描电镜、高压压汞及低压氮气吸附测试等手段，结合薄片和测井资料，深入分析了研究区龙马溪组碳酸盐矿物类型、分布特征及其对页岩储层的微观影响。结果表明：碳酸盐矿物类型主要为方解石、白云石及铁白云石，主要有6种微观赋存状态，分别是分散状碳酸盐矿物、与生物相关方解石、交代石英方解石、交代结构铁白云石、与有机质伴生的方解石/白云石和与黄铁矿伴生的方解石/白云石；碳酸盐矿物含量与TOC值呈明显的正相关关系，说明碳酸盐矿物有利于有机质的沉积；在碳酸盐矿物含量低于10%时，碳酸盐矿物含量与页岩孔隙度相关性差，当碳酸盐矿物高于10%时，页岩孔隙度随碳酸盐矿物含量的增加而减少；研究区龙马溪组页岩微孔孔隙体积和比表面积与碳酸盐矿物含量呈正相关，大孔和中孔的孔隙体积和比表面积与碳酸盐矿物含量呈负相关，但相关系数均较低，碳酸盐矿物含量对中孔的孔隙体积影响最为明显；总体而言，研究区龙马溪组页岩碳酸盐矿物颗粒作用类似于石英颗粒，起到对储层的支撑作用，但其含量增加对页岩储层具有破坏作用。

关键词： 页岩; 四川盆地; 碳酸盐矿物; 龙马溪组; 储集性能

本文引用格式

郭芪恒, 金振奎, 耿一凯, 赵建华, 常睿, 崔学敏, 王金艺 . 四川盆地龙马溪组页岩中碳酸盐矿物特征及对储集性能的影响[J]. 天然气地球科学, 2019 , 30(5) : 616 -625 . DOI: 10.11764/j.issn.1672-1926.2018.12.002

Abstract

In order to investigate the characteristics of carbonate minerals in gas shale and its effect on the reservoir performance,the Longmaxi Formation in the Sichuan Basin is selected for this study.Based on the analyses of X-ray diffraction,scanning electron microscope,porosity analyses of high-pressure mercury injection and nitrogen adsorption experiments,combined with data of thin sections and well logging,different types and some characteristics of carbonate minerals present in the Longmaxi Formation gas shale have been discussed and its influence on reservoir performance was revealed.Carbonate mineral types are mainly calcite,dolomite and ankerite.Six different types of microscopic occurrence have been identified,and pore types associated with carbonate minerals are mainly intragranular dissolution pores and inter-partical pores.TOC and carbonate mineral contents have positive correlation,which indicates high carbonate minerals content may favour the enrichment of organic matter in this gas shale.It's found that when the carbonate mineral content in the Longmaxi Formation is less than 10%,the carbonate mineral content has no correlation with shale porosity.When the carbonate mineral in the shale increases to higher than 10%,the shale porosity decreases with increasing carbonate mineral content.The pore volume and specific area of micropore and carbonate mineral content have negative correlations for both the mesopore and macropore,especially for the pore volume of the mesopores.In conclusion,the carbonate mineral particles act similarly to quartz particles supporting reservoir skeleton,however,the increase of carbonate mineral contents has an adverse effect on shale reservoirs by reducing its porosity.

Key words： Shale; Sichuan Basin; Carbonate minerals; Longmaxi Formation; Reservoir performance

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