Bulletin Article

 

Select lacustrine and marine depositional settings show a spectrum of styles of carbonate deposition and illustrate the types of carbonates, with an emphasis on microbialites and tufa, to be expected in early rift settings. Early rift lake examples examined in this review article are all from East Africa: Lakes Turkana, Bogoria, Natron and Magadi, Manyara, and Tanganyika. Other lake examples include four from the western United States (Great Salt Lake and high lake level Lake Bonneville, Mono Lake and high lake level Russell Lake, Pyramid Lake and high lake level Lake Lahontan, and Searles Lake) and two from Australia (Lakes Clifton and Thetis). Marine basin examples are the Hamelin Pool part of Shark Bay from Australia (marginal marine) and the Red Sea (marine rift).

Landsat images and digital elevation models for each example are used to delineate present and past lake-basin margins based on published lake-level elevations, and for some examples, the shorelines representing different lake levels can be compared to evaluate how changes in size, shape, and lake configuration might have impacted carbonate development. The early rift lakes show a range of characteristics to be expected in lacustrine settings during the earliest stages of continental extension and rifting, whereas the Red Sea shows well advanced rifting with marine incursion and reef–skeletal sand development. Collectively, the lacustrine examples show a wide range of sizes, with several of them being large enough that they could produce carbonate deposits of potential economic interest. Three of the areas—Great Salt Lake and high lake level Lake Bonneville, Pyramid Lake and high lake level Lake Lahontan, and the Red Sea—are exceedingly complex in that they illustrate a large degree of potential depositional facies heterogeneity because of their size, irregular pattern, and connectivity of subbasins within the overall basin outline.

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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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A review of major oil and gas discoveries of 2013 shows a down year in terms of quantity—but that’s not the whole story.

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Described as "Gondwana's enigmatic twins" -- exploration in Africa and Latin America faces challenges above ground as well as below.

American Association of Petroleum Geologists (AAPG)
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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, Bitumen/Heavy Oil, Oil Shale, Shale Gas, Stratigraphic Traps, Structural Traps, Subsalt Traps, Tight Gas Sands
American Association of Petroleum Geologists (AAPG)
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Explorer Director’s Corner

 

It’s a big world out there and AAPG has Members living and working in all corners. It’s our pleasure to serve them as they explore and produce oil and natural gas to fuel the planet.

American Association of Petroleum Geologists (AAPG)
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Explorer Emphasis

 

Some highlights from international activity in 2014.

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“These days, shows like The Big Bang Theory seem to pass for science content.” That’s Scott Sampson, one of this year’s AAPG Geosciences in the Media Award winners.
American Association of Petroleum Geologists (AAPG)
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Seemingly endless images and slogans, from both industry supporters and critics, remind us almost daily that the public conversation about energy these days is about the future.

American Association of Petroleum Geologists (AAPG)
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The impact of the rapid economic growth of “Asian giants” China and India is such that African oil supplies now face increased demand to fuel this growth and, therefore, increased E&P activity.

American Association of Petroleum Geologists (AAPG)
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