| 不同岩性火山岩孔隙度压力敏感性及其影响因素：以长岭断陷火山岩为例 |
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| 引用本文： | 张丽华,王敏,单刚义,潘保芝,曹玥.不同岩性火山岩孔隙度压力敏感性及其影响因素：以长岭断陷火山岩为例[J].吉林大学学报(地球科学版),2022,52(2):382-389. |
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| 作者姓名： | 张丽华 王敏 单刚义 潘保芝 曹玥 |
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| 作者单位： | 1.吉林大学地球探测科学与技术学院,长春130026
2.中国石化东北油气分公司, 长春130000 |
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| 基金项目： | 国家自然科学基金项目（NSFC 42074119）；国家重点研发计划项目（2020YFE0201300） |
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| 摘 要： | 为了解不同岩性火山岩孔隙度的压力敏感性，笔者选取长岭断陷安山岩、角砾凝灰岩和凝灰岩的代表性岩样，分别进行3.4、8.3、13.1、17.9、22.8、27.6、32.4、37.2 MPa多个覆压条件下的气体法孔隙度测量。结果表明，随着压力的增大，3种岩性岩样的孔隙度呈不同幅度的减小，幅度减小程度由大到小的岩性依次为凝灰岩、角砾凝灰岩、安山岩；说明凝灰岩的孔隙压力敏感性较强、角砾凝灰岩的孔隙压力敏感性居中、安山岩的孔隙压力敏感性最弱。经X射线衍射全岩分析、偏光显微镜下岩石薄片鉴定、高压压汞仪实验和基于CPMG脉冲序列的核磁共振实验分析显示，岩石组份、颗粒分选、孔径分布是影响孔隙压力敏感性的关键因素；塑性矿物体积分数越大、颗粒越小、孔径越小，相应孔隙度的压力敏感性越强。
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| 关 键 词： | 火山岩 压力敏感性 孔隙度 压汞 岩石薄片 全岩分析 |
| 收稿时间： | 2018-05-16 |
Analysis on Porosity Stress Sensitivity of Volcanic Rocks with DifferentLithology and Its Influencing Factors:#br#
Taking Volcanic Rocks in Changling Fault Depression as an Example |
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| Zhang Lihua,Wang Min,Shan Gangyi,Pan Baozhi,Cao Yue.Analysis on Porosity Stress Sensitivity of Volcanic Rocks with DifferentLithology and Its Influencing Factors:#br#
Taking Volcanic Rocks in Changling Fault Depression as an Example[J].Journal of Jilin Unviersity:Earth Science Edition,2022,52(2):382-389. |
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| Authors: | Zhang Lihua Wang Min Shan Gangyi Pan Baozhi Cao Yue |
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| Institution: | 1. College of GeoExploration Science and Technology, Jilin University, Chang chun 130026，China
2. Sinopec Northeast Oil & Gas Company, Jilin, Changchun 130000，China |
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| Abstract: | In order to understand the pressure sensitivity of porosity of volcanic rocks with different lithology,the representative rock samples of andesite, breccia tuff and tuff in Changling fault depression were collected to measure porosity by gas method under the overburden pressures of 3.4, 8.3, 13.1, 17.9, 22.8, 27.6, 32.4 and 37.2 MPa respectively. The results show that with the increase of pressure, the porosity of the three lithological types of samples decreases in different ranges, and the decreasing level is tuff, breccia tuff and andesite from large to small，whichindicates that the pore stress sensitivity of tuff is the strongest, breccia tuff is in the middle, and andesite is the weakest. The analyses of whole rock X-ray diffraction, rock slice identification under polarizing microscope, high-pressure mercury porosimeter experiment and nuclear magnetic resonance experiment based on CPMG pulse sequence show that rock composition, particle sorting and pore type are the key factors affecting pore pressure sensitivity; The larger the volume fraction of plastic minerals, the smaller the particles and the smaller the pore size, the stronger the pressure sensitivity of the corresponding porosity. |
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| Keywords: | volcanic rock pressure sensitivity porosity mercury intrusion rock thin section whole rock analysis |
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