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Recently Added in Bulletin
 
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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The Natih Formation in Oman is an exceptionally well–exposed and studied example of a large (>1000 km [621 mi]) epeiric, shallow marine, tropical carbonate platform system with adjacent organic-rich intrashelf basins. It serves as an outcrop analog for many of the mid-Cretaceous giant oil reservoirs as well as for unconventional reservoirs in the Mesozoic of the Arabian plate.
American Association of Petroleum Geologists (AAPG)
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The world-class Middle–Upper Devonian carbonate outcrops of the Lennard Shelf, Canning Basin, Western Australia, offer a unique opportunity to examine reefal carbonate shelf-to-basin evolution in response to multiple coeval extrinsic and intrinsic drivers. Variable styles of carbonate stratigraphic architecture and heterogeneity developed as a function of the interplay between long hierarchical accommodation trends, global biological crises, greenhouse-to-transitional climatic changes, and syndepositional tectonics.
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The classic angular unconformity at Siccar Point became a landmark location in the history of geology after a boat trip to the site by James Hutton and his colleagues Professor John Playfair and Sir James Hall in 1788. Hutton successfully used the unconformity to support his view that the Earth’s landforms and geological record resulted from uniform natural processes such as sedimentation, uplift, erosion, and renewed sedimentation through deep geologic time.
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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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Tide-dominated or tide-influenced coastal marine deposits form some of the most complicated and largest hydrocarbon fields in the world (Wood, 2004 and references cited therein). Good outcrop analogs can provide significant insight to geologists for recognizing tidal influence in core and interpreting petrophysical log data, thus reducing uncertainty and risk when developing depositional models and planning for field development.
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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Fault-related fold models that illustrate the geometry and kinematic development of petroleum traps and structures are frequently used to assist basin exploration and development of structurally complex oil fields. Worldwide, several petroleum-rich provinces are situated in convergent strike-slip settings with adjacent convergent structures that are commonly petroleum traps.
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 Danian carbonates exposed in the Urbasa–Andia plateau (western Pyrenees, North Spain) provide the opportunity to examine at different scales the facies types and architecture of a greenhouse ramp to rimmed shelf from the slope to coralgal reefal margin through to the highly restricted evaporitic inner shelf areas, integrated with a range of porosity-forming, early diagenetic phases associated with third-order highstands and lowstands.
American Association of Petroleum Geologists (AAPG)
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Recently Added in Interpretation

Recently Added in Environmental Geosciences
 
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 herein document temporal changes in dissolved and gaseous methane concentrations in 12 domestic water wells completed in Late Devonian clastic aquifers in northeastern Pennsylvania over time periods from 0.2 to 2 yr. Wells with initial methane concentrations regarded as low (<5 mg/L), moderate (5–15 mg/L), and high (>15 mg/L) were all used in our study for comparative purposes.
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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One of the challenges confronting carbon dioxide capture and sequestration (CCS) in geologic media over extended periods of time is determining the caprock sealing capacity. If the pressure of supercritical carbon dioxide (scCO2) injected in the repository overcomes the caprock sealing capacity, leaking of scCO2 may enter other porous formations, compromising the storage formation, or even may go back to the atmosphere, and thus the process of sequestration becomes futile.

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Net fluid production and pressure data were gathered to estimate the amount of CO2 storage space available and the potential for additional oil recovery using CO2-enhanced oil recovery (EOR) in the Phacoides sandstone, McKittrick oilfield, San Joaquin Valley, California. 

American Association of Petroleum Geologists (AAPG)
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