... studies of polished thin-sections, and scanning electron microscope (SEM) observations show that most of the sandstones have a significant clay content (e.g., kaolinite, illite, and chlorite) and fractures. Most of the igneous rocks are chloritized. We show that the velocities and quality factors...

...D. S. Guo; M. E. Smith; K. E. Tucker Summary Systematic time-lapse pulsed-neutron capture (PNC) logging was conducted during a 2-year steam-foam mechanistic field trial in the steamflooded Monarch reservoir, which is composed of interbedded sandstones, conglomerates, siltstones, and diatomaceous...

... in-situ stress, the normalized Mohr failure envelope approach is in better agreement with the measured stress values (from mini-frac tests) in sandstone, while the sonic log approach gives closer match in shale. 7 12 1993 18 10 1996 29 10 1996 1 12 1996 1 12 1996 Copyright...

...C. B. Tjølsen; Gyrid Johnsen; Gunnar Halvorsen; Alf Ryseth; Eivind Damsleth Summary Heterogeneous reservoir units comprised of fluvial channel sandstones that alternate vertically and laterally with finer grained, nonreservoir lithologies pose a serious problem to production drilling and field...

.... In fields where there is both lateral and stratigraphic (vertical) com-partmentalization, it may be difficult sometimes to distinguish the two. The sampling strategy is key to being able to do this. In this section, we focus on data from the Ross sandstone, a continuous high net-to-gross reservoir...

...G. C. Borgia Summary Nuclear magnetic resonance (NMR) of 1 H nuclei of liquids in saturated porous rocks furnishes an increasingly important tool in core analysis as well as in well-logging. In particular, there are several basic questions regarding NMR downhole logging in reservoir sandstones...

... properties that makes SMAL a valuable logging concept. frequency application resonance phenomenon spe formation evaluation smal method wellbore resonance experiment wellbore transmitter resonance enhancement sandstone excitation log shear wave saturation upstream oil & gas vibration...

... deformation of the load-bearing grain framework, seem dominant in high-porosity (Statfjord-type) sandstones and should be incorporated into predictive models of production-induced compaction of quartz-rich reservoir rock. Equal loads were applied in all three directions perpendicular to the cube faces...

... samples consisting of grainstones, packstones, wackestones, and mudstones were studied. Also, Berea sandstone was tested for comparison with limestone. The results show linear negative correlations on a log-log scale between pore compressibility and differential pressure for all the tested samples...

...J. J. Rathmell; G. A. Tibbitts; R. B. Gremley; H. R. Warner, Jr.; E. K. White Summary A newly designed polycrystalline-diamond-compact (PDC) core bit and water-based muds with bridging solids are shown to provide 4-in. diameter cores with a 2.5-in. uninvaded center. High-permeability sandstones...

... the importance of composition, distribution, and accessibility of minerals in determining the macroscopic behavior of the rocks. For the studied samples, wettability of sandstones is related to the presence of kaolinite, while wettability of carbonates seems to be related to pore-size distribution...

... in river-dominated delta fringe sands of the Louisiana Gulf Coast. The excellent agreement warrants consideration of the new PNC log equation over the current industry standard equation as the primary method of evaluation in this type sandstone. The response of the natural gamma ray log to shaly sandstones...

... tectonic stresses are suspected. This model can account for situations where sandstones are under higher horizontal stress than adjacent shales. The overburden stress is a principal stress but not necessarily the maximum principal stress. If the strains are equal to zero, this model reduces to the uniaxial...

... pressure gradient basin structural hinge line fruitland formation coalbed methane fluid dynamics sandstone upstream oil & gas san juan basin hydrologic characterization thickness spe formation evaluation reservoir characterization Coalbed methane resources in the Upper Cretaceous...

... properly to be useful in reservoir models. Table 1 SUMMARY OF FRACTURES IN WELL SHCT-1 CORE   Paludal Zones 3 and 4 (60°) Cozzette (85°) Core recovered, ft 266 115 Sandstone in core, ft 92 115 Number of fractures intersected 23 37 Average fracture spacing, ft 2.8 3.0...

...Seetharaman Ganapathy; Dana G. Wreath; Min T. Lim; Bruce A. Rouse; Gary A. Pope; Kamy Sepehrnoori Summary Coreflood experiments in naturally heterogeneous sandstone outcrop cores were conducted 1ijld simulated. Displacements included waterfloods and polymer floods containing tracers for oil...

... sand pore drilling fluid chemistry gauge hole formation damage feldspar sandstone drilling fluid selection and formulation completion fluid drilling fluids and materials hydraulic fracturing smectite lower stevens sand kern county north cole levee field illite drilling fluid management...

... & gas capture cross section repeatability sandstone gamma ray curve interpretation base log well logging gamma ray log time-lapse comparison sigm curve perforation log analysis effective porosity porosity saturation change variation low-salinity environment evaluation reservoir pnc...

...James J. Howard; William E. Kenyon; Chris Straley Summary Proton nuclear-magnetic-resonance (NMR) longitudinal relaxation time, T 1 , in water-saturated sandstones is related closely to pore size distributions. Most of the sandstones shown in this paper exhibit a relatively narrow T 1 distribution...

... 1993 Copyright 1993, Society of Petroleum Engineers displacement test displacement berea sandstone production history pressure history enhanced recovery core sample fluid dynamics history upstream oil & gas dispersivity dispersion miscible displacement permeability...