
第29卷第5期 2015年10月
现代地质 GEOSCIENCE
青海聚乎更水合物赋存区岩心微观孔隙、
裂隙的微CT图像表征
李承峰,刘昌岭,孟庆国,胡高伟,张巍,卢振权”
文怀军4,李永红’,王伟超”
No.5 Vol. 29
Oct.2015
(1.国土资源部天然气水合物重点实验室青岛海洋地质研究所,山东青岛266071;2.中国石油大学信息与控制工程学院山东青岛266555;3.中国地质调查局油气资源调查中心,北京100029;4.青海煤炭地质局,青海西宁810001:
5.青海煤炭地质局一0五勘探队,青海西宁810007)
摘要:孔隙和裂隙的微观结构是影响岩石声波速度、渗透率等物性参数的重要因素,这些物性参数是冻土区天然气水合物成藏规律研究和资源勘探的重要依据。针对青海聚乎更钻探区钻井岩心,采用微米级计算机断层扫描技术(微CT)对岩心内部的微观孔隙和裂隙进行了形态表征和定量分析。结果表明:泥岩样品中的裂隙较为丰富且连通性较好,裂隙宽度多为100~200μm;而砂岩样品中孔隙分布较为分散且少有显著的连通喉道,数量上以体积小于0.1mm的微孔隙为主;通过三维图像体素统计法估算了孔隙和裂隙相对整个岩心的体积含量,其中砂岩样品的孔(裂)隙度为2.36% ~2.89%,泥岩样品的孔(裂)隙度为1.04%~3.64%。
关键词:微CT;天然气水合物;聚乎更钻探区;岩石;微观结构
中图分类号:P618.1
文献标志码:A
文章编号:10008527(2015)05118905
CT Image Characterization of Pores and Fissures in Rock
CorefromJuhugengGasHydrateAreainQinghai
LI Cheng-feng', LIU Chang-ling', MENG Qing-guo', HU Gao-wei', ZHANG Wei?,
LU Zhen-quan,WEN Huai-jun',LI Yong-hong,WANG Wei-chao
(1. Key Laboratory of Gas Hydrate, Ministry of Land and Resources, Qingdao Institute of Marine Geology, Qingdao, Shandong 266071, China:
2. College of Information and Control Engineering, China Unisersity of Petroleum, Qingdao, Shandong 266555, China ;
3. Oil & Gas Suney, China Geological Suney, Beijing 100029, Chine; 4. Qinghai Bureau of Coal Geology, Xining, Qinghai 810001, China;
5. Qinghai No. 105 Coal Geological Exploration Team, Xining, Qinghai810007, China)
Abstract : Microstructure of pores and fissures is an important factor which influences the rock physical parame-ters such as acoustic velocity, permeability. These physical parameters are the important foundation for the gas hydrate accumulation and exploration in permafrost. The rock core samples recovered from Juhugeng district in Qinghai Province were studied in this paper. The pores and fissures of these samples were detected by the mi-cro-focus computer tomography (micro CT). The results show that fissures widely exist in mudstone in good connectivity with the widths between 100 to 200 μm. However, pores are distributed dispersedly and there are poorly connected throats in sandstone with volumes of most pores lower than O. 1 mm. The porosities of cores are estimated to be 2.36% -2.89% (sandstone samples) and 1.04% -3.64% (mudstone samples) respec-tively by the method of counting the voxel of 3D gray images.
收稿日期:2015-03-10;改回日期:2015-07-25;责任编辑:威开静基金项目:国家自然科学基金项目(41376078,41302034,41474119)。
作者简介:李承峰,男,研究实习员,1987年出生,光学工程专业,主要从事天然气水合物模拟实验技术研究。
Emial : chengfenglee@ 163. com。
通信作者:刘昌岭,男,研究员,博士生导师,1966年出生,海洋地质专业,主要从事天然气水合物研究工作。
Email : qdliuchangling@163, com。