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Recently Added in Bulletin
 
Depositional interpretation and sequence stratigraphic analysis of carbonate mudrocks requires numerical analysis and data integration to achieve quantitative, predictive stratigraphic and geochemical models. A depositional and sequence stratigraphic analysis is built for a basinal interval of the Tuwaiq Mountain and Hanifa Formations, Saudi Arabia.
American Association of Petroleum Geologists (AAPG)
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Confidently defining the trajectory of faults that control structural traps is a recurring challenge for seismic interpreters. In regions with fault related folds, seismic and well data often constrain the upper fold geometry but the location and displacement of the controlling fault are unknown.
American Association of Petroleum Geologists (AAPG)
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Well logs such as spontaneous potential and gamma ray historically have been the only tools available for facies evaluation of non-cored wells in the McMurray Formation.
American Association of Petroleum Geologists (AAPG)
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The fault-related folds observed in the south Pyrenean fold and thrust belt are hybrid structures with elements of detachment folding as well as elements of fault bend and fault propagation folding.
American Association of Petroleum Geologists (AAPG)
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Studying fine-grained siliciclastic deposits of late Middle Devonian in the northern Appalachian Basin provides an exquisite natural laboratory to observe the complex environments in which mud can accumulate. More detailed correlation and facies characterization of this succession provide a wealth of information and insight into the diverse transport mechanisms responsible for distributing clastics hundreds of kilometers away from a tectonically active source area.
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Exceptional outcrop conditions in the Dolomites of northern Italy allow appreciation of facies variability, depositional geometries, and platform-to-basin relationships at seismic scale that developed during a complex sedimentary evolution. This itinerary focuses on two Triassic microbial carbonate platforms, the Latemar and Sella, providing examples of key concepts that are fundamental for the interpretation of subsurface geologic bodies.
American Association of Petroleum Geologists (AAPG)
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The carbonate and siliciclastic outcrops of the Guadalupe Mountains in the Permian Basin of West Texas and New Mexico have provided a rich set of basic and advanced conceptual models for geologists across the entire spectrum of experience for carbonate-ramp and steep-rimmed–platform settings as well as the adjacent deep-water siliciclastics not dealt with here.
American Association of Petroleum Geologists (AAPG)
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The Roda Sandstone Member (Lower Eocene, Tremp-Graus Basin, Spanish Pyrenees) is interpreted as a well-exposed multiscale Gilbert-type delta. It is formed by multiple prograding lobate-shaped sandstone bodies up to 5 km (3 mi) long and 2–3 km (1–2 mi) wide, each constructed by a number of smaller scale (hunderds of meters) lobes that stack in a compensational mode responding to relative base level changes.
American Association of Petroleum Geologists (AAPG)
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The southern Canadian Rockies is an excellent area in which to examine and discuss compressional hydrocarbon traps for three main reasons.
American Association of Petroleum Geologists (AAPG)
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The Mut Basin in southcentral Turkey contains a rich variety of Cenozoic carbonate deposits that developed on a complex pre-Miocene topography and can be studied in seismic-scale, three-dimensional outcrops. These include open and rimmed carbonate shelves with steep slopes, small isolated platforms, and mixed carbonate–siliciclastic systems showing reciprocal sedimentation.
American Association of Petroleum Geologists (AAPG)
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Recently Added in Interpretation

Recently Added in Environmental Geosciences
 
Cambrian–Ordovician strata of the midwestern United States are considered a promising reservoir for geologic storage of carbon dioxide. To assess the potential of the Ordovician St. Peter Sandstone, storage-resource estimates were generated using a hierarchical approach to estimating prospective storage resources.
American Association of Petroleum Geologists (AAPG)
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The successful implementation of geologic carbon sequestration depends on the careful evaluation of the petrophysical characteristics of the storage reservoir. Two petrophysical properties, porosity and permeability, constrain the reservoir in terms of its storage potential and injectivity.
American Association of Petroleum Geologists (AAPG)
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Two different approaches have been used to evaluate the potential for CO2 geologic sequestration and CO2-assisted enhanced oil recovery in the major oil fields in Ohio: a volumetrics-based method, which uses field volumetric data to calculate CO2 storage capacity, and a production-based method, which uses historical oil and gas production data to calculate CO2 storage capacity.
American Association of Petroleum Geologists (AAPG)
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Two-dimensional seismic refraction tomography was used to map the bedrock topography beneath Hallsands beach in southwest Devon, United Kingdom. Seismic refraction data were acquired from 11 spreads, 4 parallel to the beach and 7 normal to the beach, with either 12 or 24 geophones at 5-m (16-ft) spacing. Eight sediment cores were used to calibrate the velocity model.
American Association of Petroleum Geologists (AAPG)
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Drilling for oil/gas and trawling on a continental shelf can cause damage to hard-bottom communities. Moving these activities offshore poses a threat to offshore communities. Habitat complexity is correlated with species diversity. The relationship of bottom relief to benthic species richness is not well understood in deeper communities.
American Association of Petroleum Geologists (AAPG)
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Upward migration of brine because of pressurization resulting from injection is a risk of disposal of water produced with oil and geologic carbon storage. Analysis of the net production in each zone associated with oil production activities in the southern San Joaquin Valley, California, determined that net injection caused by disposal of water produced with oil occurred in zones above the shallowest zone with net production in several oil fields.
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The reservoir sedimentology and depositional environment of the Lower Cretaceous Alam El Bueib Formation in the Betty-1 well, Shoushan Basin, were investigated by studying lithofacies, petrography, and calcareous nannofossils. The sedimentary lithofacies indicate a fluvial to shallow-marine depositional environment.
American Association of Petroleum Geologists (AAPG)
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Numerical geochemical modeling was used to study the effects on pore-water composition and mineralogy from carbon dioxide (CO2) injection into the Pennsylvanian Morrow B Sandstone in the Farnsworth Unit in northern Texas to evaluate its potential for long-term CO2 sequestration.
American Association of Petroleum Geologists (AAPG)
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Substrate relief is a common characteristic of hard-bottom offshore banks and is associated with benthic biodiversity. Earlier studies revealed varying relief associated with offshore mesophotic communities.
American Association of Petroleum Geologists (AAPG)
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We report the results of analysis and interpretation of 19,278 predrilling groundwater samples from water wells in the Appalachian Basin for dissolved methane collected from 2009 to 2012 (11,309 samples from northeastern Pennsylvania and 7969 samples from a western area that included north–central West Virginia, eastern Ohio, and southwestern Pennsylvania).
American Association of Petroleum Geologists (AAPG)
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