Bulletin Article

 
Understanding the distribution and geometry of reservoir geobodies is crucial for net-to-gross estimates and to model subsurface flow. This article focuses on the process of dolomitization and resulting geometry of diagenetic geobodies in an outcrop of Jurassic host rocks from northern Oman. Field and petrographic data show that a first phase of stratabound dolomite is crosscut by a second phase of fault-related dolomite. The stratabound dolomite geobodies are laterally continuous for at least several hundreds of meters (sim1000 ft) and probably regionally and are one-half meter (1.6 ft) thick. Based on petrography and geochemistry, a process of seepage reflux of mesosaline or hypersaline fluids during the early stages of burial diagenesis is proposed for the formation of the stratabound dolomite. In contrast, the fault-related dolomite geobodies are trending along a fault that can be followed for at least 100 m (328 ft) and vary in width from a few tens of centimeters to as much as 10 m (sim1–33 ft). Petrography, geochemistry, and high homogenization temperature of fluid inclusions all point to the formation of the dolomite along a normal fault under deep burial conditions during the Middle to Late Cretaceous. The high 87Sr/86Sr ratio in the dolomite and the high salinity measured in fluid inclusions indicate that the dolomitizing fluids are deep basinal brines that interacted with crystalline basement. The dolomitization styles have an impact on the dimension, texture, and geochemistry of the different dolomite geobodies, and a modified classification scheme (compared to the one from Jung and Aigner, 2012) is proposed to incorporate diagenetic geobodies in future reservoir modeling.
Show more American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/linking-process-dimension-texture-and-geochemistry.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Linking process, dimension, texture, and geochemistry in dolomite geobodies: A case study from Wadi Mistal (northern Oman)

Explorer Article

 

Discoveries were comparatively sparse, but they persisted steadily throughout the year. Here are some of the more significant discoveries of the past year.

American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/discoveries-made-it-a-year-to-remember-hero.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Exploration highlights for 2013 Discoveries Made It a Year to Remember
 

Rocky road to success: AAPG member Simon Donato found adventure and much more – when he accepted the personal challenge of finding archaeological sites in the rugged and dangerous mountains overlooking the Strait of Hormuz.

American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/adventure-scientists-explore-remote-regions-2012-02feb-hero.JPG?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Oman’s Musandam Peninsula offered challenges 'Adventure Scientists' Explore Remote Regions

Explorer Emphasis

 

Every major producer in the Middle East will be represented at AAPG’s upcoming GEO 2016 conference in Bahrain next month.

American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/todays-geosciences-tomorrows-energy-hero.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true GEO 2016: Today’s Geosciences, Tomorrow's Energy
 

Improved imaging technology has helped explorationists in the Sultanate of Oman reawaken a sleeping giant.

American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/3-d-seismic-revives-dormant-field-in-oman-hero.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 3-D Seismic Revives Dormant Field in Oman
 

An added dimension: 3-D seismic data is an essential ingredient in operators’ efforts to understand the risks and nuances of shale plays.

American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/shales-complexity-boosts-seismic-activity-fig1.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Where would we be without shale plays? Shales’ Complexity Boosts Seismic Activity

Explorer Foundation Update

 

It has a new name, a new energy and a new lineup of experts, all primed to spread geoscience knowledge around the world. “It” is AAPG’s newly named Global Distinguished Lecture Program – emphasis on the “global” – which dates back to 1941 but continues to be the Association’s flagship initiative for offering the latest in geologic science to AAPG affiliated geological societies and universities.

American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/distinguished-lecture-tours-announced-for-2014-15-fig-1.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Distinguished Lecture Tours Announced for 2014-15

Explorer Spotlight On…

 

Geoscience students from the University of Utah took the top prize in this year’s AAPG/AAPG Foundation Imperial Barrel Award competition, beating out 10 other teams from geoscience departments from around the world.

American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/utah-team-wins-iba-fig1.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Global competition Utah Team Wins IBA

VG Abstract

 

To explore and develop unconventional petroleum resources, our focus should be on improving Knowledge, Technology, and a deeper comprehension of the natural processes controlling their existence.

American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/images/_site/AAPG-newlogo-vertical-morepadding.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true The Curious Case of Petroleum-Expulsion Fractures in Organic-Rich Shales: Genesis and Impact on Unconventional Pervasive Petroleum Systems
 
Desktop /Portals/0/images/_site/AAPG-newlogo-vertical-morepadding.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Looking at Exploration through the Arab-D Eyes

Field Seminar

Muscat Oman 12 December, 2017 12 December, 2017 39003
 
Muscat, Oman
12 December 2017

Date: 12 December
Duration: 12:30pm to 5:30pm
Field Trip Leader: Husam Al Rawahi, GSO
Field Trip Fee: The field trip fee is included as part of the workshop registration fees

Seats are limited and will be confirmed on a first come first served basis

For more information, contact Anastasia Kuzmenko

Wadi Al Khoud exposes a number of tectonostratigraphic units, including autochthonous siliciclastic and carbonate sediments that range in age from late Cretaceous to Quaternary. The main deposits in the area are divided into four formations, the late Cretaceous clastics of the Al Khoud Conglomerate Formation and the shallow marine carbonate units of the Al Jafnyn (Umm Er Radhuma in the subsurface), Al Rusail (Rus in the subsurface) and Al Seeb (Dammam in the subsurface) formations. These rocks uncoformably overlie a spectacular ophiolite succession which includes deep-oceanic sediments. The Oman ophiolite was thrust over the northern margin of Oman during the late Cretaceous orogenic event, resulting in the development of new sedimentation patterns, faults and fractures.

This fieldtrip will cover three main stops in Al Khoud village:

Stop 1: Deep-oceanic sediments and ophiolite.

Stop 2: The unconformity between the Al Khoud Formation and Al Jafnyn Formation.

Stop 3: Shallow marine carbonate sediments of Al Jafnyn, Al Rusail and Al Seeb Formations.

Stop 4: (optional) Foraminifera Graveyard.

In this fieldtrip, we will focus our discussions on the reservoir characteristics, seal potential and tectonostratigraphic evolution of this part of Oman. There will be a brief mention of the dinosaur collection found within the Al Khoud Conglomerate Formation and mineral usage of the limestones (Seeb) and gypsum (Rus) in cement manufacturing. If lucky, shark teeth might be found in the carbonates of the Seeb Formation.

Muscat Oman 27 October, 2017 28 October, 2017 37063
 
Muscat, Oman
27-28 October 2017

Field Trip: Reservoir Scales and Heterogeneities and their Impact on Project Decisions
Date: 27 — 28 October 2017
Field Trip Location: Northern Huqf Gharif Formation (Clastics)
Field Trip Registration Fee: $1500 (includes accommodation in a guest house, all f&b and travel arrangements)
Registration Deadline: 11 October 2017
Seats on the field trip are very limited. Please ensure your book your place well in advance to avoid disappointment

Field development requires certain decisions to be made depending on field life and each decision will require a specific type of model. The field trip will focus on aspects of sediment body geomentry, facies and linked reservoir properties as well as field scale barriers and baffles.

The Upper Gharif Formation is composed of fluvial sandstones with an overlying incised valley fill estuarine sequence leading to transgression of Khuff Carbonates. Stacking of channels, net to gross and potential barriers and baffles can be observed in these outcrops as well as facies variations.

Day 1: Travel to Northern Huqf by 4x4 vehicle and investigate outcrops. Camp overnight.

Day 2: Northern Huqf outcrops. Return to Muscat

Register Now

Workshop

Muscat Ad Dakhiliyah Oman 30 October, 2017 01 November, 2017 32799
 
Muscat, Ad Dakhiliyah, Oman
30 October - 1 November 2017

Unlike many workshops with focus on new technologies for doing “this” or “that”, this workshop is going to focus on “doing the right thing” for the “right reasons”. The outcome of Decision Based Integrated Modeling is expected to allow making better and more effective decisions faster.

Request a Visit
 

Request a visit from Saad Fahd Al-Awwad!

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