Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Tracking sand grains across super-continents narrows search for oil and gas off the west coast of Ireland

29.11.2007
Using laser analysis techniques never previously applied to sandstone, researchers at University College Dublin have discovered that sand grains in drill cores from the Corrib gas field off the west coast of Ireland originated from Greenland and Canada, not from Ireland as previously thought.

According to the findings published in Geology, a leading scientific journal published by the Geological Society of America, the sand grains were transported there by ancient rivers, up to 1,000 km long, which drained a now-vanished super-continent some 230 million years ago.

“With this new geological discovery, we can highlight other areas off the western Irish seaboard where similar sandstones to those from the Corrib gas field are likely to have been laid down by these newly-discovered ancient rivers,” says Dr Shane Tyrrell from the UCD School of Geological Sciences who led the research. “And because these sandstones are proven to act as good reservoirs for hydrocarbons, this will help narrow the search for potential oil and gas accumulations off the west coast of Ireland.”

Sandstones are made up of many individual grains of different minerals, and oil or gas can be stored in the spaces between these grains. Its potential to store oil and gas is related to the area from which the individual sand grains originated.

The new technique applied by the UCD geologists involves sampling individual grains using a laser. The laser drills a small hole into the sand grains and a stream of gas carries particles into a mass spectrometer which is used to measure the different isotopes of lead (Pb). “By sampling with a laser we were able to measure Pb isotopes in individual grains of the mineral K-feldspar, a common component in sandstones” explains Dr Tyrrell.

“Pb isotopes in K-feldspar grains have a very distinct fingerprint which they carry with them as they are released from rocks by erosion and are transported to where they form the sandstone under investigation. By linking the sand grains to their source, it is possible to track ancient rivers and the pre-historic pattern of uplands and basins”

“Rocks from different regions on Earth can have distinct abundances of Pb isotopes so we could tell that K-feldspar sand grains from the Corrib gas field could only have originated from Greenland and Canada” says Dr Tyrrell. “Greenland and North America were, of course, much closer to Ireland 230 million years ago, as the Atlantic Ocean had not yet formed.”

“Beneath the seas surrounding our island, there are deep sedimentary basins which have been developing for the last 250 million years,” says Dr Tyrrell. “These sedimentary basins have been the focus of much research at the UCD School of Geological Sciences, as they are current targets for oil and gas exploration.” This particular study, funded by Science Foundation Ireland, is currently being expanded to investigate other sandstones in basins along the NE Atlantic margins.

Dominic Martella | alfa
Further information:
http://www.ucd.ie

More articles from Earth Sciences:

nachricht Monitoring lava lake levels in Congo volcano
16.05.2018 | Seismological Society of America

nachricht Ice stream draining Greenland Ice Sheet sensitive to changes over past 45,000 years
14.05.2018 | Oregon State University

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Explanation for puzzling quantum oscillations has been found

So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics

Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...

Im Focus: Dozens of binaries from Milky Way's globular clusters could be detectable by LISA

Next-generation gravitational wave detector in space will complement LIGO on Earth

The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...

Im Focus: Entangled atoms shine in unison

A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.

The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...

Im Focus: Computer-Designed Customized Regenerative Heart Valves

Cardiovascular tissue engineering aims to treat heart disease with prostheses that grow and regenerate. Now, researchers from the University of Zurich, the Technical University Eindhoven and the Charité Berlin have successfully implanted regenerative heart valves, designed with the aid of computer simulations, into sheep for the first time.

Producing living tissue or organs based on human cells is one of the main research fields in regenerative medicine. Tissue engineering, which involves growing...

Im Focus: Light-induced superconductivity under high pressure

A team of scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg investigated optically-induced superconductivity in the alkali-doped fulleride K3C60under high external pressures. This study allowed, on one hand, to uniquely assess the nature of the transient state as a superconducting phase. In addition, it unveiled the possibility to induce superconductivity in K3C60 at temperatures far above the -170 degrees Celsius hypothesized previously, and rather all the way to room temperature. The paper by Cantaluppi et al has been published in Nature Physics.

Unlike ordinary metals, superconductors have the unique capability of transporting electrical currents without any loss. Nowadays, their technological...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Save the date: Forum European Neuroscience – 07-11 July 2018 in Berlin, Germany

02.05.2018 | Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

 
Latest News

Supersonic waves may help electronics beat the heat

18.05.2018 | Power and Electrical Engineering

Keeping a Close Eye on Ice Loss

18.05.2018 | Information Technology

CrowdWater: An App for Flood Research

18.05.2018 | Information Technology

VideoLinks
Science & Research
Overview of more VideoLinks >>>