Articles

Article Image
April 2015

On the use of coincident shots and receivers in Megabin geometry and in orthogonal geometry

Gijs J. O. Vermeer

Recently two papers were published in the RECORDER that dealt with a comparison of Megabin geometry with orthogonal geometry in the context of 5D interpolation (Duncan et al., 2014; Harger and Schweigert, 2014). What struck me is the use of coincident shots and receivers in the Megabin geometries and also…

Article Image
April 2015

The advantages of applying cableless technology: A case study in Colombia

Hector A. Alfonso

The results and experiences from a 3D survey recently carried out by Ecopetrol and its partner Talisman, in the Llanos Basin of Colombia, are presented. More than 8000 channels patch on land were used for the first time in Colombia using cableless technology.

...
Article Image
April 2015

Seismic exploration in extreme topography: Acquisition for optimal imaging

Mike Hall, Peter Maxwell, and Anna Leslie

Seismic exploration in areas of rugged and extreme topography is dangerous, difficult and expensive. Because of these environmental and economic factors it is not uncommon for data acquired in such areas to be inadequately sampled in space for imaging purposes. Also, long source-receiver offsets are often required in order to…

Article Image
April 2015

An integrated strategy: constrained tomography inversion of multi-type data for near surface velocity model building

Liansheng Liu, Lidong Gao and Zhiyu Zhang

After analyzing the theory assumptions and the pros and cons of three methods in near surface model building, which have been widely used in data processing, the three of us all agree that an “Integrated Strategy”, based on constrained first arrival tomography inversion, should be introduced as described in this…

Article Image
April 2015

CRS azimuth gathers and CRS shot gathers for improved fault imaging in Alpine 3D seismic data

Henning Trappe, Eliakim Schuenemann, Juergen Pruessmann, Sonja Suckro, Hans-Gert Linzer, Martin Schachinger

In a case study from the Austrian Alps, the capability of Common-Reflection-Surface processing (CRS) for comprehensive fault imaging and analysis is demonstrated. CRS processing is used to generally improve the signal-to-noise ratio and to regularize the dataset in different domains. We show an offset-azimuth regularization to generate well populated gathers…

Article Image
April 2015

Introduction to April Technical Articles

Amanda Knowles

Because we had a surplus of fantastic papers for last month’s Value of Integrated Geophysics (VIG) Edition, the April RECORDER carries a continuation of similarly themed articles.

...
Article Image
April 2015

Geophysical Methods for Mapping a Shallow Unconsolidated Gas Sand

Rebecca Daniels and Brian Schulte

In southwest Saskatchewan Talisman Energy holds the surface to basement rights in several sections of land over an older Devonian Birdbear field. Producers in this area have re-visited this field, drilling for heavy oil in the thin, unconsolidated McLaren sands draped over Devonian highs. These new wells utilize Cold Heavy…

Article Image
April 2015

Reliable Geophysics

Marian C. Hanna and Doug Uffen

Geophysics rocks! If you are a geophysicist and you’re reading, this you know what geophysics can offer, but does your team know that too? It is fair to say that over the past ten (10) years, the E&P industry has seen a step increase in seismic acquisition and processing, especially…

Article Image
March 2015

Hierarchical Seismic Imaging: A Multiscale Approach

Jean Virieux

Different challenges of resources discovery and management, better mitigation of natural hazards, and acute understanding of the earth’s system require high-resolution imaging of the earth in more complex regions at various scales. Dense multicomponent surveys with a broad range of frequencies have been deployed by the industrial and academic communities…

Article Image
March 2015

Introduction To March Focus: Value of Integrated Geophysics

Amanda Knowles

For years I have lived my life by the mantra, ‘When you don’t know what to do, you know what to do: research!’ There is great comfort knowing that you can turn to history or more knowledgeable, experienced people to provide facts and guide you. This tactic can be applied…

Article Image
March 2015

Overview of VIG Columns in RECORDER: May 2013 – March 2014

George Fairs

As part of the VIG (Value of Integrated Geophysics) initiative, a series of articles and columns were published in the RECORDER from May 2013 until May 2014 inclusive. The purpose was to advance the use of geophysics for business purposes by educating and inspiring our readership. The articles and columns…

Article Image
March 2015

Articulating the time, cost, and benefits of a seismic processing project

Lee Hunt

The net value of seismic is measured in various ways, but is usually reduced to a calculation of what additional economic benefit we expect to gain from the seismic information, weighed against the cost of the seismic information itself. The costs of the seismic are typically assumed to be quite…

Article Image
March 2015

Rock Physics Driven Seismic Data Processing for the Athabasca Oil Sands, Northeastern Alberta

David Gray, Seann Day and Scott Schapper

Canada has the third largest oil reserves of any country in the world. The bulk of the economically recoverable oil reserves is bitumen found in Alberta; Alberta has 26.7 Gm3 of remaining crude bitumen reserves (Alberta Oil Sands Industry Quarterly Update, Summer 2013). The Athabasca Oil Sands reservoirs of Northeastern…

Article Image
March 2015

VOQC: Value Oriented Quality Control in Seismic Processing

Lee Hunt, Peter Cary, Dan Tican, Mike Perz, Ritesh Kumar Sharma, Nirupama Nagarajappa, Xinxiang Li, and Satinder Chopra

The practicality of carrying out similar work to that of our case study example may be debated by some. There is little doubt that the phase and scaling issues that we encountered do require further thought. Our approach of applying single constant phase corrections and amplitude scalers to the gathers…

Article Image
March 2015

Value In Integrated Geophysics Where Do We Go From Here?

John L.J. Duhault

You have now read or scanned through several articles that embrace the concept of adding value by illustrating how one can improve the return on capital for their own oil and gas properties. Where is the VIG going for 2015 and beyond?

...
Article Image
February 2015

Known Knowns, Known Unknowns and Unknown Unknowns in Land Exploration Seismology

Peter Cary

We geophysicists and geologists are generally not eager to compare ourselves with politicians. We are, after all, scientists who come to an understanding of nature from evidence of what is true rather from what we want to be true. But in this case Rumsfield’s efforts to infer definite conclusions about…

Article Image
February 2015

Introduction To February Focus: Electromagnetic Methods

Martyn Unsworth

This special issue of the CSEG RECORDER features three contributed articles describing recent developments in electromagnetic (EM) methods. While EM methods were some of the first geophysical methods to be developed for mineral exploration, they were rapidly surpassed by the number of seismic surveys undertaken in hydrocarbon exploration. Thus today…

Article Image
February 2015

Imaging SAGD steam chambers: traditional ERT vs broadband electromagnetic methods

Sarah G. R. Devriese and Douglas W. Oldenburg

The Athabasca oil sands, located in Northern Alberta, Canada, are one of the largest oil reserves in the world. Over the last 30 years, industry has developed the Steam Assisted Gravity Drainage (SAGD) method to extract heavy oil that is too viscous to be extracted using conventional methods and is…

Article Image
February 2015

New developments in audio-magnetotelluric exploration: Case study from Darnley Bay area, N.W.T

David K. Goldak and Ryan W. Olson

Darnley Bay occurs within the Amundsen Gulf and is located within the Inuvialuit settlement region of the Western Canadian Arctic. It is home to one of the largest gravity anomalies in the world. With a diameter of approximately 60 km and an amplitude exceeding 130 mGal, the source of the…

Article Image
February 2015

Magnetotelluric studies of lithospheric structure beneath Western Canada: insights into plate tectonics both past and present

Martyn Unsworth

Electromagnetic (EM) methods were originally developed for mineral exploration owing to the large contrast in electrical resistivity between many ore bodies and the host rock. They have subsequently found application in a range of fields including geothermal exploration, hydrogeology and environmental geophysics. In addition to applied studies, EM methods are…