Characteristics of micropores in mudstones of the Cretaceous  Qingshankou Formation, Songliao Basin

doi:10.7623/syxb201301004

Editorial office of ACTA PETROLEI SINICA ›› 2013, Vol. 34 ›› Issue (1): 30-36.DOI: 10.7623/syxb201301004

• Petroleum Exploration • Previous Articles Next Articles

Characteristics of micropores in mudstones of the Cretaceous Qingshankou Formation, Songliao Basin

HUANG Zhenkai 1,2,3 　CHEN Jianping 1,2,3　 WANG Yijun 4　 XUE Haitao 5　 DENG Chunping 1,2,3 　WANG Min 5

Received:2012-07-25 Revised:2012-10-15 Online:2013-01-25 Published:2013-04-09

松辽盆地白垩系青山口组泥岩微观孔隙特征

黄振凯 1,2,3 　陈建平 1,2,3 　王义军 4 　薛海涛 5 　邓春萍 1,2,3　王　民 5

1. 提高石油采收率国家重点实验室北京 100083;2. 中国石油勘探开发研究院北京 100083; 3. 中国石油天然气集团公司油气地球化学重点实验室北京 100083;4. 大庆油田有限责任公司第一采油厂黑龙江大庆 163000; 5. 东北石油大学地球科学学院黑龙江大庆 163318

通讯作者: 黄振凯
作者简介:黄振凯，男，1985年8月生，2003年获大庆石油学院地球科学学院地球化学专业学士学位，现为中国石油勘探开发研究院博士研究生，主要从事油藏地球化学研究。
基金资助:
国家自然科学基金项目（No.41172134）、国家重点基础研究发展计划（973）项目（2011CB211701）和中国石油天然气股份有限公司科技攻关项目（2011A-0203）资助。

Abstract

Abstract:

This paper deals with mudstone sampled from the first member of the Cretaceous Qingshankou Formation in the Songliao Basin. We qualitatively and quantitatively investigated characteristics of its micropores using scanning electron microscope (SEM), field-emission SEM (FE-SEM), gas adsorption and high-pressure mercury-injection methods. The results indicate that there are mainly five pore types in the mudstone, including matrix intercrystal, organic, dissolution, intergranular and intracrystal pores as well as micron to nano microfissures. Pores in the mudstone are mainly composed of micropores and meso-pores with pore volume generally ranging from 0.0018 to 0.0300mL/mg, specific surface area from 0.91m²/g to 31.02m²/g and porosity from 1.2% to 3.9%. It is believed that compositions and concentrations of various minerals in the mudstone determine, to a certain extent, development of micropores. For instance, the mudstone porosity increases with increasing content of organic matter(OM), illite or pyrite but decreases with increasing content of chlorite, quartz, calcite or anorthose. Moreover, the mudstone porosity has a poor correlation with content of kaolinite, indicating that abundance of kaolinite may not affects variations of mudstone porosity.

Key words: micropore, pore volume, specific surface area, porosity, mudstone, Qingshankou Formation, Songliao Basin

摘要：

以松辽盆地白垩系青山口组一段泥岩为研究对象，综合利用扫描电镜、场发射电镜、气体吸附法及高压压汞法对其内部微观孔隙进行了定性和定量研究。结果表明该套泥岩主要发育5种类型孔隙（基质晶间孔隙、粒间孔隙、有机质孔隙、晶内孔隙、溶蚀孔隙）以及微米-纳米级微裂缝。泥岩孔隙主要以微孔和介孔为主，孔容为0.0018～0.0300mL/mg，比表面积为0.91～31.02m²/g，孔隙度较低，为1.20%～3.87%。岩石的组成成分和含量在一定程度上控制了孔隙的发育和分布。孔隙度随有机质、伊利石及黄铁矿含量的增加而增大，随绿泥石以及石英、方解石、斜长石含量的增加而降低，而与高岭石含量相关性差，表明孔隙度的大小可能不受高岭石的影响。

关键词: 微观孔隙, 孔容, 比表面积, 孔隙度, 泥岩, 青山口组, 松辽盆地

HUANG Zhenkai　CHEN Jianping　WANG Yijun　XUE Haitao　DENG Chunping　WANG Min . Characteristics of micropores in mudstones of the Cretaceous Qingshankou Formation, Songliao Basin[J]. Editorial office of ACTA PETROLEI SINICA, 2013, 34(1): 30-36.

黄振凯　陈建平　王义军　薛海涛　邓春萍　王　民 . 松辽盆地白垩系青山口组泥岩微观孔隙特征[J]. 石油学报, 2013, 34(1): 30-36.

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Characteristics of micropores in mudstones of the Cretaceous Qingshankou Formation, Songliao Basin

松辽盆地白垩系青山口组泥岩微观孔隙特征

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