‘Understanding Carbonate Mudrocks’: Sedimentary rocks that produce oil and gas

A special lecture by Dr. John D. Humphrey at GUtech

Carbonate mudrocks are limestones that exist in many parts of Oman and elsewhere. The process of their formation and significance in different environments and their application within the oil and gas sector was explained yesterday by Prof. Dr. John D. Humphrey at the German University of Technology in Oman (GUtech) as part of a special student lecture tour organized by the European Association of Geoscientists and Engineers (EAGE). Dr. Humphrey is from King Fahd University of Petroleum & Minerals in Saudi Arabia. He presented a lecture entitled “Understanding Carbonate Mudrocks” in the University’s Research Hall. According to Prof. Humphrey, Oman is a great place to study carbonate rocks, for both conventional carbonate systems and unconventional deep-water carbonates. During the lecture, case studies of mudstone/chalk reservoirs were presented. Carbonate mudrocks are made of calcium carbonates, many of which are so-called source rocks that produce and store reservoirs of oil and gas. They have been deposited millions of years ago as chalks, starting with the Jurassic age. These carbonate mudrocks are increasingly becoming the targets of unconventional petroleum system exploration and development. These deposits are important for both conventional and unconventional petroleum systems. Amal Al Hajri, 4th year student in Applied Geosciences said that Prof. Humphrey’s talk helped her to plan for her thesis. “I would like to include chalks in my Bachelor thesis studies,” she said.

Prof. Humphrey visited Oman in 2002 for the first time from the USA. He has more been recently working at KFUPM, and has been a regular visitor for summer school excursions with his students. “There are many amazing, remarkable geological exposures in Oman,” he said. He and his students and other professors usually visit and explore different rock formations in Jebel Shams, Wadi Tiwi, Salalah, and other sites in Oman every summer. There are plans to have joint summer excursions with GUtech in future.

Dr. John D. Humphrey is Associate Professor and Assistant Chairman of Geosciences at King Fahd University of Petroleum and Minerals. His appointment is in the Department of Geosciences, within the College of Petroleum Engineering and Geosciences. Prof. Humphrey received his Ph.D. degree from Brown University/ USA in Geological Sciences. Prior to joining KFUPM in 2017, he spent 25 years on the faculty of Geology and Geological Engineering at Colorado School of Mines in USA. He was Head of Department for seven years there.

His areas of specialisation include carbonate diagenesis and geochemistry, carbonate sedimentology and stratigraphy, carbonate reservoir characterization, unconventional carbonate reservoirs, stable isotope geochemistry, and paleoclimatology. He has been a consultant to the oil and gas and mining industries for thirty years. Dr. Humphrey is a Fellow of the Geological Society of America and a Trustee Associate of the American Association of Petroleum.

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