李闯^1,,
赵建国^2,,,
王宏斌¹,
潘建国¹,
龙腾²,
邓继新³,
李智²
1. 中国石油勘探开发研究院西北分院, 兰州 730020
2. 中国石油大学(北京)油气资源与探测国家重点实验室, 北京 102249
3. 成都理工大学信息工程学院, 成都 610059

基金项目: 国家科技重大专项课题"下古生界-前寒武系地球物理勘探关键技术研究"（2016ZX05004-003），国家自然科学基金项目"针对碳酸盐岩储层的跨频段（从地震频率-超声频率）岩石物理实验与建模研究"（41574103），以及"跨频段岩石物理实验与理论驱动的地震速度频散成像研究"（41974120）联合资助


详细信息

作者简介: 李闯, 男, 1982年7月生, 高级工程师, 主要从事岩石物理、储层预测研究.E-mail:lichuang@petrochina.com.cn

通讯作者: 赵建国, 男, 1976年12月生, 主要从事跨频段地震岩石物理实验技术与理论研究.E-mail:zhaojg@cup.edu.cn

中图分类号: P631

收稿日期:2018-10-16
修回日期:2020-01-09
上线日期:2020-02-05

Multi-frequency rock physics measurements and dispersion analysis on tight carbonate rocks

LI Chuang^1,,
ZHAO JianGuo^2,,,
WANG HongBin¹,
PAN JianGuo¹,
LONG Teng²,
DENG JiXin³,
LI Zhi²
1. Northwest Branch of Petro China Research Institute of Petroleum Exploration and Development, Lanzhou 730020, China
2. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China
3. Institute of Geophysics, Chengdu University of Technology, Chengdu 610059, China


More Information

Corresponding author: ZHAO JianGuo,E-mail:zhaojg@cup.edu.cn

MSC: P631

--> Received Date: 16 October 2018
Revised Date: 09 January 2020
Available Online: 05 February 2020


摘要
摘要:致密碳酸盐岩在成岩和后成岩过程中形成了复杂的孔隙结构特征，其速度等地震弹性参数不仅与孔隙度有关，而且还与孔隙结构特征密切相关.为了进一步研究致密碳酸盐岩内部流体相关的速度频散特征，针对致密碳酸盐岩进行实验室的频散测量与频散理论分析尤为重要.本研究选用了一块典型的致密型碳酸盐岩样品，在对样品进行了精细的包括CT扫描与镜下薄片的孔隙结构描述基础上，进行了实验室跨频段（从地震频段-超声频段）的频散测量与频散响应分析.比较实验室跨频段岩石物理频散测量可以获得如下认识：1）较之于典型的"喷射流"机制，改进的"喷射流"模型可以半定量地解释频散测量的结果，这大大提高了对致密碳酸盐岩频散响应的理解与认识；2）改进的"喷射流"模型还不能完全精确地匹配实验室频散测量结果，这说明除了微观尺度下的"喷射流"机制，还存在着其他控制频散与衰减的机制；3）本项工作对研究致密碳酸盐岩储层中不同频段地震波响应以及对储层预测与流体识别提供了理论依据.
关键词: 致密碳酸盐/
频散/
跨频段岩石物理/
喷射流/
储层预测

Abstract:Tight carbonate rocks have formed complex pore structure through diagenesis and post-diagenesis. Their elastic properties are not only related to porosity, but also closely related to pore structure. In order to further study the velocity dispersion characteristics of fluid correlation in tight carbonate rocks, it is very important to measure the dispersion and analyze the dispersion theory in the laboratory. In this study, a typical tight carbonate rock sample is selected. Based on the detailed description of the pore structure of the sample, including CT scanning and microscopic thin section, the laboratory cross frequency (from seismic frequency band to ultrasonic frequency band) dispersion measurement and dispersion response analysis are carried out. Comparing laboratory cross-band measurement results and dispersion curve from theoretical modeling, we can obtain the following understanding:1) Compared with the typical squirt flow mechanism, the improved squirt flow model can semi-quantitatively explain the results of frequency dispersion measurements, which greatly improves the understanding of the dispersion response of tight carbonate rocks; 2) The improved squirt flow model still cannot exactly match laboratory dispersion measurement results. This shows that in addition to the microscopic squirt flow mechanism, there are other mechanisms that control dispersion and attenuation; 3) This work provides a theoretical basis for studying seismic wave responses in different frequency bands in tight carbonate reservoirs for reservoir prediction and fluid identification.
Key words:Tight carbonate/
Dispersion/
Cross-band rock physics/
Squirt flow/
Reservoir prediction



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