Report
A method for automatic shale porosity quantification using an Edge-Threshold Automatic Processing (ETAP) technique
| العنوان: | A method for automatic shale porosity quantification using an Edge-Threshold Automatic Processing (ETAP) technique |
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| المؤلفون: | Tian, Shansi, Bowen, Leon, Liu, Bo, Zeng, Fang, Xue, Haitao, Erastova, Valentina, Greenwell, H. Chris, Dong, Zhentao, Zhao, Rixin, Liu, Jinzhong |
| بيانات النشر: | ELSEVIER SCI LTD |
| سنة النشر: | 2021 |
| المجموعة: | Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences) / 中国科学院广州地球化学研究所机构知识库 |
| مصطلحات موضوعية: | Energy & Fuels, Engineering, Automatic image processing, Pore extraction on shale sample, Edge detection method, Threshold method, SEM, Pore size distribution, Chemical, PORE STRUCTURE, GAS-ADSORPTION, FE-SEM, ELECTRON-MICROSCOPY, POSIDONIA SHALE, SICHUAN BASIN, SCALE PORES, RICH SHALES, BIB-SEM, IMAGE |
| الوصف: | Scanning electron microscopy (SEM) is one of the most prevalent methods used to image and quantify the pore size distribution of shale rock, critical in understanding unconventional petroleum systems and production. Generally, digital greyscale SEM images of shale are currently processed for pore quantification either by a manual drawing method, manual threshold method, automatic threshold method, edge detection or watershed methods, all of which have some limitations that impact the quality of pore extraction results. A new, EdgeThreshold Automatic Processing (ETAP) method is reported here to enable robust extraction and quantification of pore data in shale images. Image pre-treatment makes the greyscale of regions brighter than that of kerogen set to the peak value of kerogen greyscale. The pore image is subsequently obtained using an edge detection method. A discriminant function has been designed to determine the best threshold of the greyscale image to obtain the pore image. Finally, combination of both processed pore images gives the final pore image. Our new method overcomes the impact of kerogen, mineral, roughness and artificial debris caused by pretreatment of samples, which potentially introduce errors using alternative methods. We compare our new method to a systematic manual drawing method. The processing results through ETAP provide reliable results, and gets the highest value of 0.7466 using a discriminant function Qt, compared with the automatic threshold methods, the edge detection method and watershed method. The application of the ETAP method on shale samples of the Longmaxi Formation and Qiongzhusi Formatiosn in Sichuan basin shows that samples from the Longmaxi Formation have more organic pores than that of the Qiongzhusi Formation, however a larger size of inorganic pores develop in the Qiongzhusi shale. This indicates that shale of the Longmaxi Formation has better reservoir properties and reliable preservation conditions. |
| نوع الوثيقة: | report |
| اللغة: | English |
| Relation: | FUEL; http://ir.gig.ac.cn/handle/344008/62866 |
| DOI: | 10.1016/j.fuel.2021.121319 |
| الاتاحة: | http://ir.gig.ac.cn/handle/344008/62866 https://doi.org/10.1016/j.fuel.2021.121319 |
| رقم الانضمام: | edsbas.8A9B719F |
| قاعدة البيانات: | BASE |
| DOI: | 10.1016/j.fuel.2021.121319 |
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