Time filter

Source Type

Oklahoma City, OK, United States

SandRidge Energy is an oil and natural gas exploration company headquartered in Oklahoma City, Oklahoma.SandRidge was founded in 1984 as Riata Energy, Inc. In 2006, the company changed its name to SandRidge Energy. SandRidge’s drilling activities are focused on its oil properties in the Mid-Continent and Permian Basin. The Company also maintains production in West Texas. The company owns and operates drilling rigs under the brand name Lariat Services, Inc.The company made its initial public offering on November 5, 2007, offering over 28 million common stocks at roughly $26.00 US a share. SandRidge is traded on the New York Stock Exchange under the symbol SD. However, the stock price began to drop when natural gas prices decreased in 2008. Today, SandRidge Energy has 490 million common stocks at approximately $6.00 US a share.Tom L. Ward joined the company in June 2006 when he purchased a significant interest in the company, becoming the CEO and chairman. Ward previously co-founded Chesapeake Energy and was the chief operating officer of that company from 1989 until 1996.On June 19, 2013, Tom L. Ward, who founded the company in 2006 and has served as chief executive officer and chairman of the company since it was founded, left the company, leaving James Bennett as CEO who retains his title as president. Former lead independent director Jeffrey Serota serves as interim non-executive chairman effective the same date.Bennett has served as chief financial officer of SandRidge since January 2011 and was promoted to president in March 2013. Prior to joining SandRidge he was managing director for White Deer Energy, a private equity fund focused on the oil and gas industry. From 2006 to December 2009, Bennett was employed by GSO Capital Partners, where he served in various capacities in its energy group, including as a managing director. His prior experience also includes serving as chief financial officer of Aquilex Services Corp., a First Reserve portfolio company, and as an investment banker in the energy group of Donaldson, Lufkin & Jenrette . He started his career at NationsBank. Bennett graduated with a Bachelor of Business Administration degree with a major in finance from Texas Tech University. He has served on the board of directors of the general partner of Cheniere Energy Partners L.P. and PostRock Energy Corporation. Wikipedia.

Pavlis T.L.,University of Texas at El Paso | Chapman J.B.,University of Texas at El Paso | Chapman J.B.,Sandridge Energy | Bruhn R.L.,University of Utah | And 5 more authors.
Geosphere | Year: 2012

Previous studies in the Yakataga foldthrust belt of the St. Elias orogen in southern Alaska have demonstrated high exhumation rates associated with alpine glaciation; however, these studies were conducted with only a rudimentary treatment of the actual structures responsible for the deformation that produced long-term uplift. We present results of detailed geologic mapping in two corridors across the onshore fold-thrust system: the Duktoth River transect just west of Cape Yakataga and the Icy Bay transect in the Mount St. Elias region. In the Duktoth transect, we recognize older, approximately eastwest- trending structures that are overprinted by open, northwest-trending fold systems, which we correlate to a system of northeasttrending, out-of-sequence, probably active thrusts. These younger structures overprint a fold-thrust stack that is characterized by variable structural complexity related to detachment folding along coal-bearing horizons and duplexing within Eocene strata. In the Icy Bay transect, we recognize a similar structural style, but a different kinematic history that is constrained by an angular unconformity at the base of the syntectonic Yakataga Formation. At high structural levels, near the suture, structures show a consistent northwest trend, but fold-thrust systems rotate to east-west to northeast trends in successively younger structures within the Yakataga Formation. We present balanced cross sections for each of these transects where we project the top of basement from offshore seismic data and assume a subsurface structure with duplex systems similar to, but simplified from, structures observed in the onshore transects. These sections can account for 150-200 km of shortening within the fold-thrust system, which is <33% of the likely convergence based on the subsurface geometry of the subducted Yakutat terrane lithosphere. This mismatch with known convergence is the result of loss of the earliest thrust belt structures by erosion and recycling into the orogen, sediment subduction, and three-dimensional (3D) motions that move mass through the cross section. Based on order of magnitude estimates and regional geophysical studies, we suggest that sediment subduction has been significant and probably accounts for previously recognized low Vp/Vs (compressional to shear wave velocity) ratios in the mantle wedge above subducting Yakutat lithosphere. Our section restorations also provide a simple explanation for the observed elongate bullseye pattern of low-temperature cooling ages in the thrust belt as a consequence of exhumation above the growing duplex and/or antiformal stack. Comparison with analog model studies suggests that structural feedbacks between erosion and development of décollement horizons in coal-bearing strata led to this structural style. Although previous studies based on thermochronology suggested an active backthrust at the northern edge of the thrust belt, section restorations indicate that a backthrust is allowable but not required by available data. The Yakataga fold-thrust belt has been treated as a dominantly 2D system, yet our work indicates that 3D processes are prominent. In the Duktoth transect, we interpret a group of northeast-trending thrusts as younger, out-of-sequence structures formed in response to the rapid destruction of the orogenic wedge by glacial erosion and deposition immediately offshore. We infer that these northeast-trending thrusts transfer slip downdip into a duplex system that forms the antiformal stack modeled in cross-section restorations, and we infer that these structures represent thrusting stepping back from the active thrust front attempting to rebuild an orogenic wedge that is being destroyed as rapidly as, or more rapidly than, it is being rebuilt. In the Icy Bay transect, we use the relative chronology provided by an angular unconformity beneath the syntectonic Yakataga Formation to infer that early, northwest-trending fold-thrust systems were formed along the Fairweather transform as transpressional structures. Continued strike slip carried these structures into the tectonic corner between the Fairweather and Yakataga segments of the orogen, producing a counterclockwise rotation of the shortening axis until the rocks reached their present position. © 2012 Geological Society of America.

Chapman J.B.,University of Texas at El Paso | Chapman J.B.,Sandridge Energy | Pavlis T.L.,University of Texas at El Paso | Bruhn R.L.,University of Utah | And 3 more authors.
Geosphere | Year: 2012

The eastern syntaxis in the St. Elias orogen (Alaska, USA) is one of the most complex and least understood regions within the southern Alaska coastal mountain belt. The syntaxis contains many features unique to the orogen that are essential to understanding the structural architecture and tectonic history of the collision between North America and the allochthonous Yakutat microplate. The eastern syntaxis contains the transition from transpressional structures associated with the Queen Charlotte- Fairweather fault system in the east to the Yakataga fold-and-thrust belt (YFTB) to the west. Throughout the eastern syntaxis, a prominent uncon formity at the base of the synorogenic Yakataga Formation records an erosional event related to the development of the YFTB. Strain accumulations in the eastern YFTB predate the deposition of the Yakataga Formation, extending estimates for the early development of the St. Elias orogen. Structural and stratigraphic relationships in the eastern syntaxis suggest that forethrusts associated with the transpressional system shut down and were overprinted by foldand-thrust structures in the Early to latest Miocene. Basement in the eastern syntaxis consists of the Yakutat Group, part of the Chugach accretionary complex, which is carried by numerous low-angle thrust faults in the eastern syntaxis. Exposures of basement and fault patterns within the syntaxis have implications for tectonic reconstructions of the Yakutat microplate and the geodynamics of the orogen. © 2012 Geological Society of America.

Chapman J.B.,University of Texas at El Paso | Chapman J.B.,Sandridge Energy | Worthington L.L.,Texas A&M University | Pavlis T.L.,University of Texas at El Paso | And 2 more authors.
Tectonics | Year: 2011

The Suckling Hills and Kayak Island are isolated mountain blocks located along strike from each other within the foreland of the St. Elias orogen in southern Alaska. These blocks preserve an erosional surface that was deformed by slip on northwest-dipping reverse faults in the Pleistocene. We suggest that the Suckling Hills Fault and Kayak Island Zone form a segmented fault network that links with the Bering Glacier structure to the north. This fault network separates the central Yakataga fold and thrust belt from complex, multiply deformed structures in the western syntaxis. Ongoing accretion of the Yakutat microplate to North America results in translation of structures of the fold and thrust belt into the western syntaxis. The composite Suckling Hills Fault, Kayak Island Zone, and Bering Glacier structure may have formed because the older structures of the fold and thrust belt were unfavorably oriented within the western syntaxis region. This pattern of deformation provides a template for understanding the complex deformation within the core of the western syntaxis and predicts refolding and straightening of the western syntaxis margin with continued accretion. This study provides an analog for structural overprinting and changing deformation patterns through time in orogenic corners. Copyright 2011 by the American Geophysical Union.

Catlos E.J.,University of Texas at Austin | Baker C.B.,Sandridge Energy | Sorensen S.S.,Smithsonian Institution | Jacob L.,University of Texas at Austin | Cemen I.,University of Alabama
Journal of Structural Geology | Year: 2011

The Menderes Massif (western Turkey) is a metamorphic core complex that displays linked syntectonic plutonism and detachment faulting. Fabrics in S-type peraluminous granites (Salihli and Turgutlu) in the detachment (Alaşehir) footwall change from isotropic to protomylonitic to mylonitic towards the structure. Samples from the isotropic and protomylonitic zones were imaged in transmitted light, cathodoluminescence (CL), backscattered (BSE), and secondary electrons (SE), and show that these rocks contain abundant microcracks, and that plagioclase grains have zoning consistent with magma mixing. The granites contain fluid inclusion planes (FIPs), myrmekite replacing plagioclase, and the removal of blue luminescence in K-feldspar along microcracks and grain boundaries. Calcite and hydrous minerals commonly fill microcracks. The samples record features that formed due to (1) magma crystallization and ductile deformation (FIPs, mineral zoning), (2) changes in P and/or T (impingement and stress-induced microcracks in protomylonitic rocks), and (3) differences in intrinsic mineral properties (radial, cleavage, blunted, and deflected microcracks). Overprinted microcracks indicate exhumation during pulses. The Middle Miocene ages of these granites reported elsewhere are similar to those from large-scale extensional structures in Greece's Cycladic Massif. The Menderes and Cycladic core complexes may have developed simultaneously due to the widespread intrusion of subduction-related granitoids. © 2011 Elsevier Ltd.

Borell J.,Sandridge Energy
74th European Association of Geoscientists and Engineers Conference and Exhibition 2012 Incorporating SPE EUROPEC 2012: Responsibly Securing Natural Resources | Year: 2012

The Bray-Smith equation for direct calculation of permeability from the nuclear magnetic resonance (NMR) T2 response was recently applied in several different, difficult reservoirs with excellent results. The expected production rates from calculated permeability compared closely to actual production rates. Secondary porosity from fractures or vugs complicates the ability to establish an accurate permeability value. Fractures that are open or filled can have the same characteristic log signature on conventional logs, or they may remain undetected by these standard logs. Vugs can develop as isolated features, or can be well connected to create excellent petroleum reservoirs. An adequate description of these characteristics is desirable. This paper compares the magnetic resonance permeability from the Bray-Smith equation to actual production results in open, healed, and drilling-induced fractures. It also demonstrates these responses in connected vugs, as well as in situations in which the vugs do not interconnect (oomoldic reservoirs).

Discover hidden collaborations