Bulletin Article

 

Field analogs allow a better characterization of fracture networks to constrain naturally fractured reservoir models. In analogs, the origin, nature, geometry, and other attributes of fracture networks can be determined and can be related to the reservoir through the geodynamic history. In this article, we aim to determine the sedimentary and diagenetic controls on fracture patterns and the genetic correlation of fracture and diagenesis with tectonic and burial history. We targeted two outcrops of Barremian carbonates located on both limbs of the Nerthe anticline (southeastern France). We analyzed fracture patterns and rock facies as well as the tectonic, diagenetic, and burial history of both sites. Fracture patterns are determined from geometric, kinematic, and diagenetic criteria based on field and lab measurements. Fracture sequences are defined based on crosscutting and abutting relationships and compared with geodynamic history and subsidence curves. This analysis shows that fractures are organized in two close-to-perpendicular joint sets (i.e., mode I). Fracture average spacing is 50 cm (20 in.). Fracture size neither depends on fracture orientation nor is controlled by bed thickness. Neither mechanical stratigraphy nor fracture stratigraphy is observed at outcrop scale. Comparing fracture sequences and subsidence curves shows that fractures existed prior to folding and formed during early burial. Consequently, the Nerthe fold induced by the Pyrenean compression did not result in any new fracture initiation on the limbs of this fold. We assume that the studied Urgonian carbonates underwent early diagenesis, which conferred early brittle properties to the host rock.

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Desktop /Portals/0/PackFlashItemImages/WebReady/tectonic-versus-diagenetic-origin-of-fractures.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Tectonic versus diagenetic origin of fractures in a naturally fractured carbonate reservoir analog (Nerthe anticline, southeastern France)
 
The fact that velocity models based on seismic reflection surveys commonly do not consider the near-surface geology necessitates filling the gap between the top of a velocity model and the surface of the Earth. In this study, we present a new workflow to build a shallow geologic model based exclusively on borehole data and corroborated by laboratory measurements. The study area is in Chemery (France), located at the southwestern border of the Paris Basin, where a large amount of borehole data is publicly available. The workflow starts with identifying lithologic interfaces in the boreholes and interpolating them between the boreholes. The three-dimensional (3-D) geometry of the lithologies then allows interpretation of the position, orientation, and offset of fault planes. Given the importance of the fault interpretation in the modeling process, a combination of different approaches is used to obtain the most reasonable structural framework. After creating a 3-D grid, the resulting 3-D structural model is populated with upscaled velocity logs from the boreholes, yielding the final near-surface P-wave velocity model. To better constrain the velocity model, we conducted laboratory measurements of P- and S-wave velocities in dry and water-saturated conditions on all lithologies in the model. The laboratory data were used to populate the 3-D near-surface model with VP/VS ratio values. The presented workflow accounts for one-dimensional borehole data and is much more iterative and time-consuming than workflows based on two-dimensional seismic sections. Nevertheless, the workflow results in a robust 3-D near-surface model allowing for structural interpretations and revealing the 3-D seismic velocity field.
Show more American Association of Petroleum Geologists (AAPG)
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Events Blog

 

Don't miss the chance to put your brand front and center and in the minds of geoscience professionals from around the globe. ICE London is the one event you can't afford to miss in 2017. Secure your sponsorships today!

American Association of Petroleum Geologists (AAPG)
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Explorer Article

 
Since the dramatic expansion of AAPG/ AAPG Foundation’s Visiting Geoscientist program in the fall of 2014, thousands of students around the globe have benefited from it.
American Association of Petroleum Geologists (AAPG)
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Team registrations are now being accepted for this year’s AAPG-AAPG Foundation’s Imperial Barrel Award program (IBA), an annual prospective basin evaluation competition for geoscience graduate students from universities around the world.

American Association of Petroleum Geologists (AAPG)
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Explorer Emphasis

 
While many are working to forecast when the price of oil might reach $80 a barrel again, renowned international strategist and geopolitical analyst Peter Zeihan, the author of “The Accidental Superpower,” predicts in stunning detail the rising and declining energy plays of 2025 and the countries that will ultimately triumph as the world’s leading producers.
American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/who-will-rule-the-world-oil-market-over-the-next-decade-hero.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Who Will Rule the World Oil Market Over the Next Decade?
 

Seismic acquisition crews in southwest France attempt to gather data without disturbing the locals.

American Association of Petroleum Geologists (AAPG)
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Explorer Foundation Update

 
The AAPG Foundation’s L. Austin Weeks Undergraduate Grant program annually awards deserving geoscience students and geoscience student organizations across the world with $500 in grant funds.
American Association of Petroleum Geologists (AAPG)
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Explorer Regions and Sections

 
It has been an interesting and eventful year in Europe for AAPG. With all the less-than-good news around, we felt it was important to maintain a program of events and activities throughout the year. Although we are constrained by the events in the industry we have still tried to match the wishes of the members.
American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/richardson-jeremy-2016-01jan.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true A Busy Year In Europe …

VG Abstract

 

This lecture will discuss the differences between carbonates and siliciclastics from their chemical composition through their distributions in time and space. Building on these fundamental differences, we will explore the challenges carbonates pose to petroleum geologists in terms of seismic interpretation, reservoir quality prediction, field development, etc. Peppered with humorous personal stories, still raging academic debates, and the heartfelt frustrations of real industry professionals, the aim is to inspire students and young professionals to rise to the occasion and embrace the reservoir rocks that petroleum geologists love to hate.

Show more American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/siliciclastic-reservoirs.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Confounding Carbonates: The Reservoir Rocks that Won’t Play Nice
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