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Denver Microseismic Study Group 6/18/13

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Dan Hollis will be presenting to the Denver Microseismic Study Group on Tuesday, 6/18/13. The presentation will discuss how NodalSeismic has used passive data to enhance active-source data using nodal recording systems. The Long Beach 3D survey, completed in April 2011, will be used as the case study.

The information will be helpful in considering the use of nodal systems, preserving passive data, and survey design ideas that optimize the value of the passive data.

Date: Tuesday, June 18th, 11:30am to 12:30pm

Location: WPX Energy 1001 17th Street (Ground Floor by Udi's), Downtown Denver


Mining the Long Beach 3D Passive Data Set - A Review of Analyses, Results and Planning Future Survey

Presented by: Dan Hollis, Nodal Seismic


This presentation shows results from the data mining of passive seismic data that can add value to active seismic data and better understanding of geology in and around the survey area. Traditionally, passive seismic monitoring in the oil and gas industry has been used for monitoring hydraulic fracturing and induced seismicity.  Recent introduction of autonomous-type (nodal) seismic data recording systems with continuous-recording capability for conventional active-source seismic reflection exploration surveys provide a valuable by-product, if the data is preserved:  a continuous passive seismic dataset from a dense seismic network over the survey area.  This presentation describes the results of applying various techniques to passive data acquired using a nodal seismic recording system from a 22 square mile 3D seismic reflection survey acquired in early 2011 in Long Beach, California.  This continuous passive data set was mined for information that adds value to the active source data, as well as other information that would benefit exploration and earthquake-related studies of the study area.  Natural seismicity and ambient noise provide the signal used to extract p-wave and shear-wave velocities, anisotropy information and seismic imaging products.  Types of analyses include time-lapse ground motion studies, micro-earthquake detection and location, surface wave interferometry, ambient noise correlation for reflection imaging, receiver functions, and teleseismic event amplitude analysis. 


Dan Hollis is Vice President of Technology for NodalSeismic, LLC, a seismic exploration company. Dan’s career includes a variety of seismic exploration positions with CGG, Subsurface Exploration Company and Geophysical Systems Corporation. His interests center on seismic exploration, in particular, autonomous seismic recording instrumentation and survey design, low-signal to noise data recovery, ambient noise analysis, and passive seismic data mining. Dan received a Bachelor of Science in Earth Science from California State University at Long Beach.  He is a member of PBGS, PC-SEG, GSH, EAGE, SEG, AAPG, SSA and is a registered geophysicist.

Study Group Format:  The Microseismic Study Group is a forum to present and discuss issues related to the acquisition, processing and interpretation of microseismic data.  It is designed for geoscientists interested in discussing case studies and furthering their understanding of all things microseismic. The initial format of the meeting will be a 20-minute presentation followed by 20-30 minutes of discussion.

Lunch is NOT provided but you are welcome to bring food to eat during the presentation.