Elastic equivalent numerical modeling based on the dynamic method of Longmaxi Formation shale digital core
文献类型：期刊论文
| 作者 | Jian ShiKai2,3; Fu LiYun2,3; Wang ZhiWei1; Han TongCheng2,3; Liu JianLin3 |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2020-07-01 |
| 卷号 | 63期号:7页码:2786-2799 |
| 关键词 | Longmaxi Formation shale Digital core Elastic equivalent numerical modeling based on the dynamic method Biot poroelastic equation Finite-difference simulation |
| ISSN号 | 0001-5733 |
| DOI | 10.6038/cjg2020N0312 |
| 英文摘要 | It is a widespread method to analyze rock elastic properties based on digital cores. As the result of many minerals, complex microstructures and strong heterogeneity in Longmaxi Formation shale, the accuracy of elastic equivalent analysis modeling by conventional rock physics method is limited, and the current popular static numerical equivalent modeling method also has strong limitations. We apply multi-threshold segmentation method to divide the high-resolution digital core images of shale into six types including pore, TOC, clay, quartz, feldspar and pyrite, whose elastic modulus were calculated by the mineral components equivalent modulus method. The changes of pore deformation and grain-to-grain contact in rock mass under different pressures were characterized by binary function watershed method. And we use orientation distribution function (ODF) to quantitatively characterize the anisotropy of mineral grain distribution. Finally, Biot poroelastic equation, applying the rotated staggered grid finite-difference technique with unsplit convolution perfectly matched layer (CPML), is used to simulate the propagation of elastic waves in digital core models under different pressures. Taking the uncompressed digital core model as the criterion, the average time delay of elastic wave propagation under different pressures is calculated, which contributes to estimate the equivalent velocity of the digital core models in each pressure. The numerical equivalent velocity is slightly higher than the velocity measured by ultrasonic experiment on the same core, so the binary function characterizing change of the rock mass microstructure and grain-to-grain contact dependent-pressure can be corrected to effectively improve the accuracy of dynamic elastic equivalent numerical modeling. |
| WOS关键词 | MICROTOMOGRAPHIC IMAGES ; CONVOLUTIONAL PML ; COMPUTATION ; SIMULATION |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000550583600023 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/97571]  |
| 专题 | 地质与地球物理研究所_中国科学院油气资源研究重点实验室 |
| 通讯作者 | Fu LiYun |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China 2.China Univ Petr East China, Sch Geosci, Qingdao 266580, Peoples R China 3.China Univ Petr East China, Key Lab Deep Oil & Gas, Qingdao 266580, Peoples R China |
| 推荐引用方式 GB/T 7714 | Jian ShiKai,Fu LiYun,Wang ZhiWei,et al. Elastic equivalent numerical modeling based on the dynamic method of Longmaxi Formation shale digital core[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2020,63(7):2786-2799. |
| APA | Jian ShiKai,Fu LiYun,Wang ZhiWei,Han TongCheng,&Liu JianLin.(2020).Elastic equivalent numerical modeling based on the dynamic method of Longmaxi Formation shale digital core.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,63(7),2786-2799. |
| MLA | Jian ShiKai,et al."Elastic equivalent numerical modeling based on the dynamic method of Longmaxi Formation shale digital core".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 63.7(2020):2786-2799. |
入库方式： OAI收割
来源：地质与地球物理研究所
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