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Title: Mineralogical alteration of Mancos shale under conditions relevant to unconventional gas reservoirs.

Abstract

Abstract not provided.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Laboratories, Carlsbad, NM
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1376825
Report Number(s):
SAND2016-8080C
646745
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the ACS Fall 2016 Meeting held August 21-25, 2016 in Philadelphia, Pennsylvania.
Country of Publication:
United States
Language:
English

Citation Formats

Kruichak, Jessica Nicole, Ilgen, Anastasia Gennadyevna, Xiong, Yongliang, Rodriguez, Mark A., Griego, James, and Wang, Yifeng. Mineralogical alteration of Mancos shale under conditions relevant to unconventional gas reservoirs.. United States: N. p., 2016. Web.
Kruichak, Jessica Nicole, Ilgen, Anastasia Gennadyevna, Xiong, Yongliang, Rodriguez, Mark A., Griego, James, & Wang, Yifeng. Mineralogical alteration of Mancos shale under conditions relevant to unconventional gas reservoirs.. United States.
Kruichak, Jessica Nicole, Ilgen, Anastasia Gennadyevna, Xiong, Yongliang, Rodriguez, Mark A., Griego, James, and Wang, Yifeng. 2016. "Mineralogical alteration of Mancos shale under conditions relevant to unconventional gas reservoirs.". United States. doi:. https://www.osti.gov/servlets/purl/1376825.
@article{osti_1376825,
title = {Mineralogical alteration of Mancos shale under conditions relevant to unconventional gas reservoirs.},
author = {Kruichak, Jessica Nicole and Ilgen, Anastasia Gennadyevna and Xiong, Yongliang and Rodriguez, Mark A. and Griego, James and Wang, Yifeng},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 8
}

Conference:
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  • Abstract not provided.
  • The Mancos B interval of the Mancos Shale is an unusually thick (up to 1345 ft or 410 m) assemblage of sandy mudstone and muddy sandstone deposited in the Western Interior seaway approximately 100 mi (161 km) offshore. The basic sedimentation unit for the Mancos B is a thin couplet consisting of a basal fine-grained sandstone component and an upper mud rock component. Individual couplets are lenticular and generally less than 0.3 ft (0.09 m) thick and 2.5 ft (0.8 m) across. The sand component has sharp upper and lower contacts and is characterized by ripple lamination, wavy lamination, flasermore » lamination, and graded lamination (rare), whereas the mud rock component has discontinuous horizontal lamination accentuated by thin sandy streaks. Paleocurrents taken from ripples are to the southeast. Sequential deposition of sand/mud couplets resulted in formation of muddy sandstone sequences that range in thickness from 25 to 90 ft (8 to 27 m). The gross sand content in a sequence increases from approximately 30% at the base to 50 to 80% at the top. Bioturbation, which is characterized by members of the Cruziana ichnofacies, increases proportionally with sand content. Sequences are usually capped by thin intervals of sandy Fe-dolomite (beds and concretions). Sequences are typically stacked into packages, ranging in thickness from 175 to 480 ft (53 to 146 m). Four main packages are present in the Mancos B. A depositional model involving uplift, sea-bottom shoaling, and sediment winnowing by episodic shelf currents is proposed for the generation of the Mancos B shelf-sand complex.« less
  • The Mancos B interval of the Mancos Shale, a major gas producer on the Douglas Creek arch is a shelf-sand complex represented by up to 1345 ft (404 m) of thinly interstratified claystone, siltstone, and very fine to fine-grained sandstone deposited approximately 100 mi (161 km) offshore in the Western Interior seaway. In the subsurface, the Mancos B is subdivided into four major units, ranging in thickness from 175 to 480 ft 953 to 146 m). Each unit thins over the arch's crest and, in the process, becomes more sand rich. In outcrops along the southern flank of the arch,more » the lower Mancos B forms a series of coarsening-upward sequences, 25 to 90 ft (8 to 27 m) thick. A typical sequence begins with silty claystone or bioturbated mudstone at the base, followed upward by bioturbated muddy sandstone, and topped with sandy dolomite (as concretions or thin beds). Sedimentary structures include horizontal lamination, wavy lamination, lenticular bedding, flaser bedding, and ripple lamination. Paleocurrent measurements from ripple foresets have a mean azimuth of 111/sup 0/. Burrows characteristic of the Cruziana ichnofacies are common to abundant in all lithofacies.« less
  • Drip tests which simulate the unsaturated conditions expected in the potential repository at Yucca Mountain are in progress to evaluate the long-term performance of spent fuel. This paper examines the corrosion behavior of the spent fuel matrix under conditions in which water is introduced at a rate of 1.5 mL every 7 days. Our recent results suggest a rapid reaction rate of the spent fuel matrix, the formation of alteration products that are similar to the sequence found in ore deposits in uranium mines, and the presence of colloidal species in the leachate. These results are compared to results frommore » two models developed for a potential repository in an unsaturated zone.« less
  • The hypothesis of French nuclear waste glass disposal in a geological repository implies a comprehensive assessment of all the glass elements liable to participate in controlling the material alteration kinetics. The hypothetical existence of kinetically limiting elements other than silica could account for the observed R7T7 glass behavior in the presence of certain clays, and notably the continued high alteration rates observed even after silica saturation occurs. Flowing experiments with solutions near silica saturation but highly subsaturated with respect to aluminum hydroxide were defined to investigate the possible limiting role of aluminum. Experiments were conducted at different flow rates withmore » the same constant steady-state H{sub 4}SiO{sub 4} activity for all the tests. The glass dissolution rate was observed to depend on the solution flow rate, indicating that under these conditions the kinetics are not controlled by dissolved silica alone. An additional experiment, in which only the Al(OH){sub 4}{sup {minus}} activity in solution was allowed to vary, demonstrated the critical role of this element. Several interpretations are discussed.« less