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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Bulletin Geologic Note

 
Precise dating and correlation of drilled wells through continental successions is challenging for hydrocarbon exploration, especially where preservation and recovery of age-diagnostic fossils is poor. As a complement or alternative to biostratigraphic dating we demonstrate the effectiveness of U-Pb geochronology via LA-ICP-MS on detrital zircon from well cuttings.
American Association of Petroleum Geologists (AAPG)
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Explorer Article

 
Integration and creative thinking were recurring themes in the 2015 Discovery Thinking forums held at the AAPG Annual Conference and Exhibition (ACE) in Denver last month.
American Association of Petroleum Geologists (AAPG)
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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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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.

American Association of Petroleum Geologists (AAPG)
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American Association of Petroleum Geologists (AAPG)
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Explorer Emphasis

 
Selected highlights from international exploration activity in 2015.
American Association of Petroleum Geologists (AAPG)
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A number of interesting stories came out of international exploration in 2015. Let’s get to the big one right away: Everybody – everybody – was talking about the Eni SpA discovery of a supergiant gas accumulation offshore Egypt. It became the year’s mind-blower.
American Association of Petroleum Geologists (AAPG)
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Some highlights from international activity in 2014.

American Association of Petroleum Geologists (AAPG)
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A year to remember: Here’s a look at the important discoveries that made global “hit” parade in 2007.

American Association of Petroleum Geologists (AAPG)
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