D. P. Sinha

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D. P. Sinha
MSc Science Technology in Exploration Geophysics
MSc university Osmania University

D. P. Sinha is a renowned geophysicist with more than 37 years of experience in the E&P industry. He is currently Vice President and Director at EESH Energy Enterprises and Technical Director (Processing) in EnerGeo India Ltd. He has been chosen as an Honorary Lecturer by the Indian Institute of Technology in Kharagpur, Indian School of Mines in Dhanbad and the 2013 SEG Honorary Lecturer for South and East Asia. He also was chosen as a Visiting Professor by the Indian Institute of Technology in Mumbai.

During his 35 years of tenure with Oil and Natural Gas Corporation of India (ONGC), he has been involved in executive management of highly dynamic multi-disciplinary exploration teams. He has in-depth knowledge and hands-on experience on geo-statistical techniques for techno-economic analysis and project monitoring. Seismic data processing, depth imaging, and Earth velocity field modeling are his key areas of expertise. He has a thorough understanding of various geo-scientific applications and its use in solving complex geophysical problems, especially in time and depth domain.

He has been awarded as the best geophysicist and recognized and awarded for his leadership, managerial and mentoring skills in ONGC for developing the next generation of technical leaders. He was declared outstanding coach by Right Management, USA and ONGC. He has been awarded a Gold Medal for his outstanding work and best technical paper ‘Pre-stack Merging and Depth Imaging' in 2008 by SPG India. As a keen and active researcher, he has been awarded for number of his technical publications in various national and international journals. Mr. Sinha obtained his Masters of Science Technology in Exploration Geophysics from Osmania University, India.

2013 SEG Honorary Lecturer, South and East Asia

Earth velocity estimationː Bridge the gap of interdependency between geology and geophysics

3D depth migration has created many opportunities for exploration and production. At the same time, it has brought many challenges. An essential prerequisite for accurate imaging in depth is, of course, an accurate estimation of the velocity Earth model. Depth imaging essentially consists of two processes – traveltime computation and downward extrapolation of the observed wavefield through a suitable algorithm. For computing traveltimes, we need to start with an accurate depth-velocity interval model, which in turn, requires accurate reflection geometries in depth with layer interval velocities. During the process, one can check the various geologic hypotheses which match the observed data (i.e., whether the horizons and velocities used in the depth model make geologic sense). For this purpose, we combine the prestack velocity analysis and model building tools to obtain the accurate initial velocity model.

Either layered or non-layered velocity models or a combination of two can yield the best possible Earth velocity model which may bridge the gap between geology and geophysics. In many geologically complex areas, especially in hilly terrain, we do not get velocity semblance that is sufficiently adequate to obtain a good velocity Earth model for the area. In such areas, estimation of the Earth velocity model has a certain amount of uncertainty regarding layer velocity and layer geometries. This can be quantified with interpretation efforts and prior geologic information.

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D. P. Sinha
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