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Shear wave velocity prediction:A review of recent progress and future opportunities

Energy Geoscience 2024年第4期5卷 36-54页

作者： John Oluwadamilola Olutoki Jian-guo Zhao Numair Ahmed Siddiqui mohamed elsaadany AKM Eahsanul Haque Oluwaseun Daniel Akinyemi Amany H.Said Zhaoyang Zhao State Key Laboratory of Petroleum Resources and Prospecting CNPC Key Laboratory of Geophysical ExplorationCollege of GeophysicsChina University of PetroleumBeijingChina Center of Excellence in Subsurface Seismic Imaging and Hydrocarbon Prediction Department of GeoscienceFaculty of Geoscience&Petroleum EngineeringUniversiti Teknologi PETRONAS(UTP)Malaysia Geology Department Faculty of ScienceAssiut UniversityAssiut71516Egypt

Shear logs,also known as shear velocity logs,are used for various types of seismic analysis,such as determining the relationship between amplitude variation with offset(AVO)and interpreting multiple types of seismic *** log is an important tool for analyzing the properties of rocks and interpreting seismic data to identify potential areas of oil and gas ***,these logs are often not collected due to cost constraints or poor borehole conditions possibly leading to poor data quality,though there are various approaches in practice for estimating shear wave *** this study,a detailed review of the recent advances in the various techniques used to measure shear wave(S-wave)velocity is carried *** techniques include direct and indirect measurement,determination of empirical relationships between S-wave velocity and other parameters,machine learning,and rock physics ***,this study creates a collection of employed techniques,enhancing the existing knowledge of this significant topic and offering a progressive approach for practical implementation in the field.

关键词： Shear wave(S-wave)velocity Direct and indirect measurement Empirical relationship Artificial intelligence(AI) Machine learning Rock physics model

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Problem of living liver donation in the absence of deceased liver transplantation program:Mansoura experience

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World Journal of Gastroenterology 2014年第37期20卷 13607-13614页

作者： mohamed Abdel Wahab Hosam Hamed Tarek Salah Waleed Elsarraf mohamed Elshobary Ahmed mohamed Sultan Ahmed Shehta Omar Fathy Helmy Ezzat Amr Yassen mohamed Elmorshedi mohamed elsaadany Usama Shiha Gatrointestinal Surgery Liver Transplantation Unit Gastrointestinal Surgical Center Mansoura University Daqahlia 35516 Egypt Anesthesia Intensive Care Department Gastrointestinal Surgical Center Mansoura Faculty of Medicine Mansoura University Daqahlia 35516 Egypt Internal Medicine Department Mansoura Faculty of Medicine Mansoura University Daqahlia 35516 Egypt Radiology Department Gastrointestinal Surgical Center Mansoura University Daqahlia 35516 Egypt

We report our experience with potential donors for living donor liver transplantation(LDLT), which is the first report from an area where there is no legalized deceased donation program. This is a single center retrospective analysis of potential living donors(n = 1004) between May 2004 and December 2012. This report focuses on the analysis of causes, duration, cost, and various implications of donor exclusion(n = 792).Most of the transplant candidates(82.3%) had an experience with more than one excluded donor(median = 3). Some recipients travelled abroad for a deceased donor transplant(n = 12) and some died before finding a suitable donor(n = 14). The evaluation of an excluded donor is a time-consuming process(median = 3 d, range 1 d to 47 d). It is also a costly process with a median cost of approximately 70 USD(range 35 USD to 885 USD). From these results, living donor exclusion has negative implications on the patients and transplant program with ethical dilemmas and an economic impact. Many strategies are adopted by other centers to expand the donor pool; however, they are not all applicable in our locality. We conclude that an active legalized deceased donor transplantation program is necessary to overcome the shortage of available liver grafts in Egypt.

关键词： Living donor Liver transplantation Excluded donors Deceased donor Liver disease

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