skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Understanding the (co)variance in petrophysical properties of CO 2 reservoirs comprising sedimentary architecture

Authors:
; ;
Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1325340
Grant/Contract Number:
SC0C12504
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
International Journal of Greenhouse Gas Control
Additional Journal Information:
Journal Volume: 51; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-04 09:55:42; Journal ID: ISSN 1750-5836
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Ritzi, Robert W., Freiburg, Jared T., and Webb, Nathan D. Understanding the (co)variance in petrophysical properties of CO 2 reservoirs comprising sedimentary architecture. Netherlands: N. p., 2016. Web. doi:10.1016/j.ijggc.2016.05.001.
Ritzi, Robert W., Freiburg, Jared T., & Webb, Nathan D. Understanding the (co)variance in petrophysical properties of CO 2 reservoirs comprising sedimentary architecture. Netherlands. doi:10.1016/j.ijggc.2016.05.001.
Ritzi, Robert W., Freiburg, Jared T., and Webb, Nathan D. 2016. "Understanding the (co)variance in petrophysical properties of CO 2 reservoirs comprising sedimentary architecture". Netherlands. doi:10.1016/j.ijggc.2016.05.001.
@article{osti_1325340,
title = {Understanding the (co)variance in petrophysical properties of CO 2 reservoirs comprising sedimentary architecture},
author = {Ritzi, Robert W. and Freiburg, Jared T. and Webb, Nathan D.},
abstractNote = {},
doi = {10.1016/j.ijggc.2016.05.001},
journal = {International Journal of Greenhouse Gas Control},
number = C,
volume = 51,
place = {Netherlands},
year = 2016,
month = 8
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.ijggc.2016.05.001

Citation Metrics:
Cited by: 5works
Citation information provided by
Web of Science

Save / Share:
  • The authors have measured the velocities and attenuations of compressional and shear waves in 29 water-saturated samples of sandstones and shales at a confining pressure of 60 MPa and at frequencies of about 0.85 MHz. The measurements were made using a pulse echo method in which the samples (diameter 5 cm, length 1.5 cm to 2.5 cm) were placed between perspex buffer rods inside a high-pressure cell. The velocity of each seismic wave was determined from the travel time difference of equivalent phase points (corrected for diffraction effects) of the signals reflected from the top and from the base ofmore » each samples. Attenuation was determined in a similar way by comparison of the diffraction corrected amplitudes of the signals. The attenuation data are presented as quality factors'': Q[sub p] and Q[sub s] for compressional and shear waves respectively and shear waves respectively. The results show that Qs is strongly correlated with V[sub s], that Q[sub p] is weakly correlated with V[sub p], and that Q[sub p] is strongly correlated with Q[sub s] [center dot] Q[sub p] is strongly dependent on the volume percentage of the assemblage of intra-pore minerals, whether they are clays or carbonates. It is concluded that the attenuation mechanism is due to the local fluid flow arising from the differential dilation of the solid rock frame and the intra-pore mineral assemblage, which is a results of their very different elastic moduli.« less
  • An outcrop-based study combining detailed lithofacies analysis with high-resolution sequence stratigraphy in the Paradox Basin, southwestern United States. has shown that complex lateral and vertical facies variations occur in relatively consistent and predictable patterns. Large-scale facies shifts of several kilometers occur across major sequence boundaries whereas small-scale lateral and vertical variations develop from stacking of individual cycles. Understanding of vertical stacking patterns and lateral distribution of facies in outcrop can be directly applied to both three-dimensional distribution of reservoir facies in the subsurface as well as the evaluation of heterogeneity within individual reservoirs. The Desert Creek and Ismay intervals ofmore » the Paradox Formation (Pennsylvanian) exposed along the San Juan River in southeastern Utah are characterized by high-frequency cyclic repetition of carbonate and siliciclastic facies controlled primarily by 4th and 5th-order changes in relative sea level. These cycles are typically mixed and consist of a basal sandstone unit interpreted to have been deposited during a relative sea level lowstand and subsequently reworked during the early phases of the next marine transgression. Black sapropelic dolomudstones, typically referred to as {open_quotes}shales{close_quotes}, record the major part of the transgressive phase. Overlying carbonates, which may contain the phylloid algal mound facies, are characterized by a well-defined shallowing-upward trend deposited during latest transgression, highstand, and the earliest stages of the next fall. High resolution outcrop studies of this type may thus provide an invaluable tool for enhancing the predictability of subsurface reservoir facies at both the exploration and development scale.« less
  • Guneshli Field is one of several large fields on the Apsheron Ridge, a bathymmic, and structural high, separating the North and South Caspian deeps. In total this trend contains more than 4 billion barrels of oil equivalent. The main reservoir is the Middle Pliocene Productive Series which is interpreted as a series of stacked wave dominated deltas. Reservoirs are fine to very-fine-grained sublitharenites, to feldspathic litharenites with excellent well-connected macro and meso pore systems. Porosity and permeability are texturally controlled due to depositional energy and provenance (as opposed to diagenetically controlled) primarily by grain size, sorting and percent of ductilemore » shale rock fragments. Rarely, carbonate cement partially occludes primary pores. Six main lithofacies were recognized in core and described according to pore throat geometry and flow unit characteristics. Porosity, permeability, and mercury injection capillary pressure data were collected on reservoir and seal rocks. These data were used to define pore throat size distribution, hydrocarbon column height, sealing capacity, and irreducible water saturation for each facies. Porosity and permeability tests on reservoir samples at increasing confining stress conditions show only minor reductions in porosity and permeability. Permeability of poorly consolidated sands, in the absence of conventional plugs, can be estimated from mercury injection data on core chips or cuttings and from grain size data. Reservoir simulation models suggest Guneshli reservoirs have good displacement characteristics and are good waterflood candidates, with recovery being as high as 40% of the original oil-in-place.« less