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Carboniferous volcanic rocks of the Junggar Basin, China, are primarily andesite and tuff. Diagenetic processes that control reservoir quality are examined. The controlling factors for oil distribution in these volcanic rocks are faulting, fracture development, and degree of weathering.
American Association of Petroleum Geologists (AAPG)
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The purpose of this study is to understand the hydrocarbon charge history of a tight gas reservoir and to provide a model for further exploration through an integrated study including x-ray micro-computed tomography and scanning electron microscopy imaging, natural gas and light oil geochemistry, and fluid inclusion petrography.
American Association of Petroleum Geologists (AAPG)
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The mechanism for petroleum accumulation in the Qinghuangdao 29 oil field, Bohai Sea, China, is examined by analyzing the gas and fluid composition and conduit architecture and calculating the intensity of boundary faults in order to better understand petroleum exploration on the Shijiutuo uplift.
American Association of Petroleum Geologists (AAPG)
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Pervasive deformation band arrays delay water breakthrough and enhance sweep when the contrast of permeability between them and the host rock is at least of three orders of magnitude, resulting in larger final produced volumes and higher total recovery.
American Association of Petroleum Geologists (AAPG)
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Seismic reflection data should be used in conjunction with petrographic and geochemical techniques to determine the presence of karst and to help improve the characterization of carbonate reservoirs and associated drilling hazards.
American Association of Petroleum Geologists (AAPG)
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Brines currently being produced in the East Poplar and Northwest Poplar oil fields, Williston Basin, Montana, are of two chemically and isotopically distinct types. The solute chemistry and Sr composition of group I brines are similar to those that contaminated the groundwater.
American Association of Petroleum Geologists (AAPG)
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Deep-marine, synrift, axial, and transverse depositional systems were studied in the upper Jurassic deep-marine successions of the central North Sea in order to assess the temporal and spatial relationships of sediments and controls on reservoir quality.
American Association of Petroleum Geologists (AAPG)
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With intensely fractured tight oil sandstones, caliper log, acoustic log, compensated neutron log, density log, dual induction logs, and laterolog 8 show fracture responses to some extent although other properties can also cause similar responses.
American Association of Petroleum Geologists (AAPG)
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The authors describe and characterize structural styles, deformation timing, and thrusting sequence in the southern Junggar fold-and-thrust belt and show how the complex geometric and kinematic evolution of individual fault-related folds impacted petroleum prospectivity.
American Association of Petroleum Geologists (AAPG)
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Early diagenetic porosity and permeability deterioration has a direct relation with sedimentary dynamics and depositional features. This study explains the role of depositional fabric on early diagenetic processes and their collective effect on petrophysical properties.
American Association of Petroleum Geologists (AAPG)
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Recently Added in Interpretation

Recently Added in Environmental Geosciences
 
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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This study simulated the injection of supercritical phase CO2 into the South Georgia Rift (SGR) basin to evaluate the feasibility of long-term storage. Because of the lack of basin data, an equilibrium model was used to estimate the initial hydrostatic pressure, temperature, and salinity gradients that represent our study area. 

American Association of Petroleum Geologists (AAPG)
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Examination of historical water-quality data (major cations and anions and total dissolved solids [TDS]) for Rock Creek, located in eastern Nebraska’s saline wetlands north of the Platte River, revealed that concentrations of sodium (Na), chloride (Cl), and TDS increased significantly in the downstream reach below the town of Ceresco, exceeding the U.S. Environmental Protection Agency (USEPA) secondary drinking water standards of 250 mg/L for Cl and 500 mg/L for TDS.

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We use sediment ages and mercury (Hg) concentrations to estimate past and future concentrations in the South River, Virginia, where Hg was released between 1930 and 1950 from a manufacturing process related to nylon production. In a previous study, along a 40 km (25 mi) reach, samples were collected from 26 of 54 fine-grained deposits that formed in the lee of large wood obstructions in the channel and analyzed for grain size, Hg concentration, and organic content. We also obtained radiometric dates from six deposits. To create a history that reflects the full concentration distribution (which contains concentrations as high as 900 mg/kg [900 ppm]), here, we treat the deposits as a single reservoir exchanging contaminated sediments with the overlying water column, and assume that the total sediment mass in storage and the distribution of sediment ages are time invariant. We use reservoir theory to reconstruct the annual history of Hg concentration on suspended sediment using data from our previous study and new results presented here. Many different reconstructed histories fit our data. To constrain results, we use information from a well-preserved core (and our estimate of the total mass of Hg stored in 2007) to specify the years associated with the peak concentration of 900 mg/kg. Our results indicate that around 850 kg (1874 lb) of Hg was stored in the deposits between 1955 and 1961, compared to only 80 kg (176 lb) today. Simulations of future Hg remediation suggest that 100-yr timescales will be needed for the South River to remove Hg-contaminated sediments from the channel perimeter through natural processes.
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 SONAR, historical and aerial photographs, and vibracoring were used to assess the type and thickness distribution of sediments impounded by Gold Ray Dam on the Rogue River in southern Oregon. From these data, a volume of about 400,000 cubic yards (

Equation EG13006eq1

) of sediment was determined for the inundated area of the reservoir.

Overall, sediment volumes in the impounded part of the reservoir were less than expected. There are three possibilities that may explain the perceived absence of sediment: (1) the gradient of the Rogue River in this stretch is less, and therefore sediment yields are less; (2) the extraction of gravels and/or other impediments upstream decreased the availability of sediments delivered into the reservoir; and/or (3) sediment was deposited by a prograding delta that filled in the inundated area of the floodplain upstream from Gold Ray Dam. The amount of sediment deposited on this inundated floodplain may have been as much as 1,800,000 cubic yards (Equation EG13006eq2), bringing the total amount of sediment impounded by Gold Ray Dam to Equation EG13006eq3 yards (Equation EG13006eq4).

Applied sedimentology is not only vital to developing a depositional model for the filling of a reservoir, but also providing insights into depositional and erosional changes that will occur upon the removal of a dam. In particular, the processes of delta formation, reoccupation of abandoned channels, and avulsion are paramount in determining sediment accumulation and distribution in reservoirs.

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