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The Woodlands, TX, United States

Anadarko Petroleum Corporation is an American oil and gas exploration company and one of the world’s largest publicly traded oil and gas exploration and production companies, with approximately 2.79 billion barrels of oil equivalent of proved reserves and annual sales volumes of 274 million BOE as of December 31, 2013. Anadarko employs a worldwide workforce of about 6,000. The company is headquartered in The Woodlands, SPD Montgomery County, Texas.The company has been the subject of multiple environmental cases, including the largest environmental contamination settlement in American history in 2014. Wikipedia.


A suite of seep samples from the vicinity of the Marco Polo field in the Green Canyon area of the Gulf of Mexico provides an exceptional opportunity to study the impact of interference from sediment background organic matter and alteration by biodegradation on thermogenic hydrocarbons from seafloor seeps. These seep samples contain a range in both the concentration of seeped hydrocarbons present and level of biodegradation experienced. In addition, the subsurface oil that sources the seepage was available for comparison. The results of the study show that it is essential to have the biomarker data from the sediment's background organic matter when dealing with low concentration seepage. These data provide a means to characterize the contribution of background organic matter to the biomarker distributions. This, in turn, allows the identification of thermogenic hydrocarbons when the concentration of seeped oil in seafloor sediments is low. In high concentration seepage, the hopanes and regular steranes were found to be more susceptible to near-surface microbial alteration, while tricylic/tetracyclic terpanes, diasteranes, monoaromatic steroids, and triaromatic steroids were more resistant. If biodegradation is severe enough, all biomarker compounds are vulnerable to alteration and very little information is preserved. In an effort to reconstruct the altered distributions, low temperature pyrolysis of the seeped oils' asphaltenes was done to liberate occluded biomarkers compounds. Although biomarkers were recovered, they did not resemble the parent oil. Characteristics of some of the recovered biomarker distributions suggest alteration by biodegradation. This implies the three dimensional structure of the asphaltenes may not offer complete protection from microbial attack. These results demonstrate why interpretation of biomarker data from seafloor seeps can be a difficult task. Care must be taken to recognize contributions from the sediment's background organic matter as well as identify alteration by biodegradation. Failure to understand these processes can lead to erroneous interpretations being made about the seep's parent oil and source rock. © 2010 Elsevier Ltd. Source


Johnson B.R.,University of North Carolina at Chapel Hill | Johnson B.R.,Anadarko Petroleum Co. | Glazner A.F.,University of North Carolina at Chapel Hill
Contributions to Mineralogy and Petrology | Year: 2010

K-feldspar megacrysts in granite and granodiorite plutons are generally inferred to be early crystallizing phases (grown to large sizes when the magma was mostly liquid) owing to their large size, euhedral form, and features that suggest deposition by magmatic sedimentation. However, phase equilibrium experiments and natural examples of crystallization and partial melting demonstrate that K-feldspar is one of the last phases to nucleate and that most crystal growth must occur after the magma has exceeded 50% crystallization and is thus largely incapable of flow and sedimentation. Megacryst size distributions, compositions, and textural relationships from the Cretaceous Tuolumne Intrusive Suite, California, reveal that the gradational transition from equigranular to megacrystic granodiorite likely occurred via textural coarsening caused by thermal cycling. Experimental and theoretical studies demonstrate that rising temperature induces relatively more melting in small crystals than in large ones, whereas linear growth rates during cooling are similar. Thus, during thermal cycling material is transferred from small crystals to larger ones. Megacryst growth via thermal cycling during incremental emplacement is consistent with the required late growth of K-feldspar, explains the presence of megacrysts in the inner parts of theTuolumne Intrusive Suite and elsewhere, and may be a common process in formation of megacrystic granitic rocks. © 2009 Springer-Verlag. Source


Mount V.S.,Anadarko Petroleum Co.
Journal of Structural Geology | Year: 2014

New seismic and well data from hydrocarbon exploration and development activity associated with the Marcellus Formation shale gas play in north-central Pennsylvania provide insight to the structural style of the Appalachian Plateau fold belt in the region north and northwest of the Allegheny structural front in Potter, Tioga, Bradford, Sullivan, Lycoming, Clinton and Centre counties. The Plateau fold belt in this area developed over a detachment in Upper Silurian Salina Group evaporites during the Permian Alleghanian Orogeny in response to north-northwest directed shortening. At the Allegheny structural front, a deep detachment in Cambrian shales that underlies the Valley and Ridge province to the south-southeast, ramps up-section through Cambro-Ordovician carbonates and Lower-Middle Silurian clastics to a shallow detachment in Upper Silurian evaporites. At the northeastern plunge of the Nittany Anticline (south and east of Williamsport, PA), only a small amount of slip is interpreted to have been transmitted into the foreland on the shallow Upper Silurian detachment. Instead most slip was consumed in fault-propagation folds immediately north of the Allegheny structural front. The Plateau fold belt, developed above the Upper Silurian evaporites, can be divided into structural domains based on fold characteristics. Domain 1 folds have short wavelengths and low amplitudes. Domain 2 salt-cored anticlines have long wavelengths and large amplitudes. Domain 3 comprises large synclines, located between Domain 2 anticlines. Halite originally beneath Domain 3 synclines is interpreted to have been mobilized, or evacuated, into the cores of adjacent Domain 2 anticlines during folding. Seismic data indicate that the base of the salt detachment underlying Plateau folds is a non-planar, stepped surface. Possible scenarios for the development of the non-planar detachment include: 1) mobilization of halite from an evaporite sequence that contained an originally non-uniform distribution of halite, 2) it is an erosion surface that existed prior to deposition of the evaporite sequence, or 3) it developed in response to buckle folding of the stratigraphic layer overlying the evaporite sequence. © 2014 Elsevier Ltd. Source


Patent
Anadarko Petroleum Co. | Date: 2012-01-03

The instant disclosure relates to a system and method of constructing drilling and production platforms useful in remote, inaccessible and/or environmentally sensitive operating environments. According to one aspect of the invention, an arctic drilling platform is provided wherein various methods and means of interlocking neighboring platform modules are provided. Means for sealing the intersections formed between a plurality of interlocked platform modules are also disclosed. Other aspects comprise improved platform floor plans, with various wellhead cellar layouts and sealing means also being described. Methods and means of enhancing the usefulness of modular storage platforms are disclosed, and a number of support post installation and removal techniques are also provided. Also taught are methods and means of adjusting the height and level of an assembled drilling platform, and for adding extension members to extend the length of a support post as needed during installation, maintenance or operations.


Patent
Anadarko Petroleum Co. | Date: 2011-04-14

The instant disclosure relates to a system and method of constructing drilling and production platforms that are particularly useful in remote, inaccessible and/or environmentally sensitive operating environments. According to one aspect of the invention, an arctic drilling platform is provided wherein various methods and means of interlocking neighboring platform modules are provided. Methods and means for sealing the intersections formed between a plurality of interlocked platform modules are also disclosed. According to further aspects of the invention, improved platform floor plans are provided, and various wellhead cellar layouts and sealing means are also described. Methods and means of enhancing the usefulness of modular storage platforms are disclosed, and a number of support post installation and removal techniques are also provided. Also taught are a variety of methods of adjusting the height and level of an assembled drilling platform, and methods and means of adding extension members useful for extending the length of a support post are also described.

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