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

American Association of Petroleum Geologists (AAPG)
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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)
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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)
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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)
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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)
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Field Seminar

Muscat Oman 10 May, 2017 10 May, 2017 38285
 
Muscat, Oman
10 May 2017

Field Trip Date: 10 May
Field Trip Time: 3pm - 7pm
Field Trip Leader: Mohammed Al Kindi, GSO

Introduction:

The Saih Hatat Structure is a large deeply eroded anticline, 80km x 50km elongated in the E-W direction, and located south of Muscat, on the eastern part of the Oman Mountains. The structure is bounded by allochthonous units of Ophiolite and deep oceanic sediments that were obducted in Late Cretaceous. During and after the obduction process, this area was subducted, along NE-dipping subduction zone, to deep crustal levels and was subsequently exhumated to surface, leading to intensive ductile deformation, under medium to high grade metamorphism, that could be clearly examined across the section of Wadi al Mayh. Mega-sheet folds, often described as the best and largest in the world, and numerous imbrications are clearly visible in this area within the Permian shelf carbonates. Along the northern contact between the ophiolite and the shelf carbonates of Saih Hatat, lie several hot springs, such as the Old Ghala spring and the al Hammam Spring. These springs emerge along a fault that separates the two rock masses. As rains falls, water percolates to considerable depth, gets heated and seeps back to surface along the fault zone.

Plan:

The field trip includes four main stops covered in one afternoon. We depart after the conference from the hotel by bus and head to our first location in Qantab, where the contact between the ophiolite and shelf carbonate is nicely exposed. We aim to be in Qantab at 4pm. We then drive through Wadi Yiti, to observe the large scale sheeth folds and low-angle detachment zones. Later, we will visit the hot water springs at the contact between the ophiolite and the shelf carbonates of Saih Hatat. We will finish the trip at about 6:15pm.

Field trip routes and locations (image from Google Earth)
Field trip routes and locations (image from Google Earth)
 Mega folds in Wadi al Mayh
Mega folds in Wadi al Mayh
The contact between the shelf carbonates of Saih Hatat on right and the Ophiolie and Tertiary Sediments, in the area of Ghala. A number of old and recent settlements have been established around the hot springs that emerge
The contact between the shelf carbonates of Saih Hatat on right and the Ophiolie and Tertiary Sediments, in the area of Ghala. A number of old and recent settlements have been established around the hot springs that emerge

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: $1450 (includes transportation, all f&B and camping equipment)
Registration Deadline: 24 September 2017

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 Oman 09 May, 2017 11 May, 2017 32794
 
Muscat, Oman
9-11 May 2017

The workshop aims at providing a state of the art review of the contrasted structural styles of the Middle East. Based on this review, a focus should be dedicated to the implications of these regional styles and structural evolutions on the region's economical prospectivity in terms of hydrocarbon resources. Among others, the specific challenges occurring during the exploration and production of these resources should be tackled …

Muscat Oman 30 October, 2017 01 November, 2017 32799
 
Muscat, 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
 

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.

Request a visit from Mohammed Al Duhailan!

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