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.

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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.

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Distinguished Lecturer Steve Dorobek’s Asia Pacific Region tour, originally slated for March, has been delayed until May – but the AAPG DL program will remain active in March with four speakers ready to tour.

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Alternative Resources, Coal, Gas Hydrates, Geothermal, Renewable Energy, Bioenergy, Hydroelectric Energy, Hydrogen Energy, Solar Energy, Wind Energy, Uranium (Nuclear), Business and Economics, Economics, Reserve Estimation, Resource Estimates, Risk Analysis, Development and Operations, Engineering, Conventional Drilling, Coring, Directional Drilling, Infill Drilling, Drive Mechanisms, Production, Depletion Drive, Water Drive, Hydraulic Fracturing, Primary Recovery, Secondary Recovery, Gas Injection, Water Flooding, Tertiary Recovery, Chemical Flooding Processes, Microbial Recovery, Miscible Recovery, Thermal Recovery Processes, Reservoir Characterization, Environmental, Ground Water, Hydrology, Monitoring, Natural Resources, Pollution, Reclamation, Remediation, Remote Sensing, Water Resources, Geochemistry and Basin Modeling, Basin Modeling, Maturation, Migration, Oil and Gas Analysis, Oil Seeps, Petroleum Systems, Source Rock, Thermal History, Geophysics, Direct Hydrocarbon Indicators, Gravity, Magnetic, Seismic, Petrophysics and Well Logs, Carbonates, Sedimentology and Stratigraphy, (Carbonate) Shelf Sand Deposits, Carbonate Platforms, Carbonate Reefs, Dolostones, Clastics, Conventional Sandstones, Deep Sea / Deepwater, Deepwater Turbidites, Eolian Sandstones, Estuarine Deposits, Fluvial Deltaic Systems, High Stand Deposits, Incised Valley Deposits, Lacustrine Deposits, Low Stand Deposits, Marine, Regressive Deposits, Sheet Sand Deposits, Shelf Sand Deposits, Slope, Transgressive Deposits, Evaporites, Lacustrine Deposits, Salt, Sebkha, Sequence Stratigraphy, Structure, Compressional Systems, Extensional Systems, Fold and Thrust Belts, Geomechanics and Fracture Analysis, Salt Tectonics, Structural Analysis (Other), Tectonics (General), Coalbed Methane, Deep Basin Gas, Diagenetic Traps, Fractured Carbonate Reservoirs, Oil Sands, Oil Shale, Shale Gas, Stratigraphic Traps, Structural Traps, Subsalt Traps, Tight Gas Sands
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Explorer Emphasis


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

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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.

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Tough terrain, challenging locales, political upheavals: Welcome to the world of international seismic work, where the hardest part of the job might be just getting to the job.
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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.

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Field Seminar

Muscat Oman 21 January, 2016 22 January, 2016 21264
Muscat, Oman
21-22 January 2016

This field trip consists of two days discussing concepts related to structural and stratigraphical seals both in exploration and production scales.

Muscat Oman 19 January, 2016 19 January, 2016 20942
Muscat, Oman
19 January 2016

Known worldwide for its spectacular geology, the key geological units in the stratigraphy of Oman are exposed in the Muscat area. It is only a short distance to some excellent outcrops ranging from the Permo-Triassic basement to the Permo-Triassic sequence and the Semail Ophiolite found in the oceanic crust and upper mantle emplaced on the autochthonous Mesozoic carbonate succession of the Oman margin during the Late Cretaceous.


Muscat Oman 18 January, 2016 20 January, 2016 16517
Muscat, Oman
18-20 January 2016

This workshop has the primary goal to share knowledge, case studies, techniques and workflows pertaining to the understanding and prediction of hydrocarbon seals for exploration and production in the Middle East. These seals range in age from Pre-Cambrian to Tertiary.    

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