教师：Dr. Michael Fehler

时间：12月9日（周一）- 12月12日（周四）13：30 – 15：30

地点：地质宫529教室

教师简介：

Michael Fehler is a Senior Research Scientist in the Department of Earth, Atmospheric and Planetary Sciences at the Massachusetts Institute of Technology. He previously worked in the College of Oceanography at Oregon State University and Los Alamos National Laboratory where he was leader of the Geophysics Group and later the Division Director of the Earth and Environmental Sciences Division. He was Technical Project Manager for two joint partnerships run by the SEG Advanced Modeling Project focusing on issues related to petroleum exploration and pore pressure prediction in deep water environments. He was Editor-in-Chief of the Bulletin of the Seismological Society of America for nine years and subsequently was President of the Seismological Society of America from 2005-2007. He has coauthored two editions of a book on seismic wave propagation and scattering published in 1998 and 2012. He has authored or coauthored more than 125 peer-reviewed papers. His interests include seismic imaging, reservoir characterization, seismic scattering, geothermal energy, and induced seismicity.

课程简介：

Lecture 1 Title: Can humans create earthquakes? An overview of how hydraulic fracturing can induce seismicity

Summary: Hydraulic injections are routinely used in oil and gas extraction, in the development of engineered geothermal systems, and in the geological sequestration of carbon dioxide. This method may increase the permeability of source rock, making it possible for oil, gas, or heat, to be recovered. Alternatively, the injections are done at low pressure to inject waste water or CO2. While applied frequently, there are many aspects of hydraulic fracturing that are not well understood, such as the induced seismicity produced during these operations. While this induced seismicity is useful to monitor the hydraulic fracturing processes, it may also cause fear to nearby communities. I will discuss several cases where induced seismicity has been observed that illustrate several aspects of the seismicity. I will discuss the mechanisms of hydraulic fracturing and how earthquakes are caused by it. Finally I will discuss the benefits of studying the induced seismicity.

Speaker: Michael Fehler

Lecture 2 Title: Seismicity and Joint Geophysical Analysis of the Krysuvik Region, Southwest Iceland

Summary: The Krysuvik region of Southwest Iceland is located along the Reykjanes Ridge, which is an extension onto land of the mid-Atlantic ridge system. It is thus an active spreading system that is undergoing volcanism. We will discuss the seismicity and structure of the region near Krysuvik, which is an area of interest for geothermal energy development. We use both earthquake and magnetotelluric data to infer the structure of this region

Speaker: Michael Fehler

Talk 3 Title: Induced Seismicity Accompanying Gas Injection into a Depleted Oil Reservoir

Summary: Induced seismicity accompanying fluid injections is a topic of increasing interest because of the information that can be obtained from studying it and because of the risk it occasionally brings to surrounding populations and infrastructure. I will present a case study of induced seismicity into a depleted oil reservoir located offshore Spain. The seismicity began soon after injection started and continued well after the injection was terminated. It culminated in a series of Magnitude 3.8 – 4.2 earthquakes that occurred several weeks after injection was terminated. I will discuss new analysis of the seismic data and the modeling of the geomechanical response of accompanying flow and subsequent shut in period that allow us to better understand the nature and possible causes of the seismicity.

Speaker: Michael Fehler

Talk 4 Title: Using Multidisciplinary Simulation to Address Problems in the Petroleum Industry

Abstract:Numerical simulation is becoming more widely used to investigate a range of basic and applied problems. As simulation algorithms become better and faster, simulation is also increasingly used to develop extensive benchmark datasets for testing data processing algorithms that are used to infer model parameters from laboratory and field data. I will discuss a project that was recently undertaken to develop a model and simulation data that can be used to test methods that can predict pore pressure in rock pores at depth prior to drilling. Such predictions are essential to develop a safe and economical drilling plan. The steps used to develop the model included the development of a 3D geological model for the region, the development of a geological history that resulted in the current geological condition, the simulation forward in time of the geological evolution including the deposition of sediments and the changes in the spatial distribution of fluid pore pressure within the rock pores, the application of rock physics to convert the resulting geological model with pore pressures into a geological model, and finally seismic simulation to collect data that can be used to test pore pressure prediction methodologies.

Speaker: Michael Fehler