DLP Webinar with Per Avseth

From Cradle to Grave – The Rock Physics ‘Life Story’ of a Clastic Sediment, And Its significance in QI Studies

 

When

  Thursday 26 October 2017 - 10.00 AM (CEST)

Duration

  1 hour lecture + 30 minutes Q&A

Language

  English

Fee

  Free for EAGE members 

Requirements

  Computer with Internet connection and audio/video capabilities

 

EAGE webinars are live presentations with lecturers selected from the best presentations at EAGE Conferences. After the lecture, participants can interact with the instructor and ask questions. Joining a webinar is simple: all you need is a computer with Internet connection and audio/video capabilities (no software installation required). This service is complimentary for EAGE members and places are limited.

 

Webinar description

Present day rock physics properties and associated seismic signatures are controlled by depositional and burial history, tectonic events and diagenetic alterations. Hence, in order to fully understand the seismic signatures of a prospect, we should honor the geologic processes through time, or what we call “the memory of rocks”.

Taking into account sedimentary processes, diagenesis and tectonic events, we can predict rock physics and seismic velocities in areas with complex facies distribution and burial history. We include the effect of both mechanical and chemical compaction, as well as uplift episodes and corresponding erosion. We show how we can combine basin modeling principles and simulate porosity and rock texture evolution of sandstones during geological time, and combine these results with rock physics models in order to estimate tectonic uplifts and to predict expected seismic properties as a function of the burial history. The compaction trends of shales are also investigated, and here we rely more on empirical trends.

The resulting rock physics trends help us to better understand expected seismic contrasts for a given prospect, and to better evaluate the potential to discriminate hydrocarbons from seismic AVO data. The compaction trend controls the background slope in AVO crossplots and the low frequency model in simultaneous AVO inversion, whereas the contrast between sand and shales at a given depth controls the corresponding seismic reflectivities. The depth/burial dependent rock physics trends can be used to highlight seismic anomalies that deviates from the expected trends, whether these are associated to pressure, fluid or lithology anomalies. Furthermore, the link between rock physics and burial history allow us to generate depth-dependent probabilistic training data for the classification of AVO/seismic inversion data.

Examples from different areas are shown, focusing on the Norwegian Shelf/Barents Sea.

 

Participants' Profile

The lecture is aimed at graduate students, academics and industry professionals working in the areas of petroleum geoscience and exploration seismology

 

About the Lecturer

Per AvsethPer Avseth is a geophysical advisor at Tullow Oil in Oslo, Norway, and adjunct professor in geophysics at the Norwegian University of Science and Technology (NTNU) in Trondheim, Norway. Per received his M.Sc. in Applied Petroleum Geosciences from NTNU in 1994, and his Ph.D. in Geophysics from Stanford University, California, in 2000. Per worked as a research geophysicist at Norsk Hydro in Bergen, 2001-2006, and a consultant at Rock Physics Technology, 2006-2008, and at Odin Petroleum, 2008-2012. Per’s research interests include applied rock physics and AVO analysis, for quantitative seismic exploration and reservoir characterization.

 

Registration CLOSED

In order to ensure an interaction of good quality and a sufficient time for questions and answers, spaces for this webinar are limited. The applications for this webinar have reached the maximum capacity and registration is now closed. 

This service is dedicated to EAGE members: only applicants with a valid EAGE membership will be admitted. Admitted applicants will receive a confirmation of their registration and the link for connecting to the webinar. If you were admitted, you can expect to receive a confirmation one week prior to the webinar. The link will be sent to you about 1 hour prior to the start of the webinar and you will be able to join the connection 30 minutes before the scheduled start time.

If you were not admitted to this session, please consult our Calendar of Events to learn about future webinars. EAGE webinars are also organized on demand for groups of at least 10 member: click here to learn more about requesting a webinar.