... Clay minerals such as illite and smectite are common constituents of sedimentary rocks, especially mudstones, and have a significant influence on the reservoir geomechanical and petrophysical properties (Boles, 1979; Brown et al., 2001; Tolhurst et al., 2002; Dong et al., 2018). The illite...

... rock physics model only if clay and quartz were considered structural in dry and partly disseminated in saturated conditions. In-situ smectite-to-illite transformation can explain the observations in that it creates products at pore linings that remain loosely connected with the matrix behaving like...

... fraction modeling porosity cementation evolution structural geology smectite geologic time mineral composition microstructure compaction evolutionary rock physics seg international exposition upstream oil & gas reservoir geomechanics reservoir characterization mudrock pressure modeling...

... and contain diverse clay types. To fill this gap, we have innovatively synthesized nine tight sandstones that contain different clay types and content. The experimental results show that saturated smectite-rich tight sandstones caused a significant weakening of the shear modulus while a reducation...

... ABSTRACT It is essential to quantitatively study how shale properties change during smectite-to-illite transition, which can assist us to better predict pore pressure and understand the shale diagenesis. We develop rock physics models to characterize how elastic stiffness and porosity of shale...

... elastic moduli clay mineral structural geology shale assumption fraction smectite elastic property porosity brine saturation background medium axial stress contact moduli moduli iso-frame value upstream oil & gas reservoir characterization fluid saturation shear modulus...

... smectite reservoir characterization depositional environment clay mineral structural geology Modelling of seismic properties during diagenesis in fluvial depositional environments Anders Dræge1,2 1Department of Earth Science, University of Bergen, Norway 2Centre for Integrated Petroleum Research...

... indicates the silicified zone associated with high resistivity, the smectite zone with low resistivity, and the reconstructed high chargeability portion corresponds to the pyrite disseminated zone in the hydrothermal breccia zone. Types of epithermal gold deposits are divided into two on the depth...

... properties Figure Log-log plot of mode velocities vs. for micas (3 highest density points) and for chlorite at = Mode is shown at left of trend line. Adsorbed water, smectites and mixed-layer clays: Figure 2. Log-log plot of mode velocities vs. density for micas (3 highest density points) and for chlorite...

... ABSTRACT No preview is available for this paper. fluid effect shale critical frequency reduction frequency upstream oil & gas velocity dispersion weakening effect reservoir characterization saturation seismic velocity mechanism smectite correction porosity transition...

... ABSTRACT No preview is available for this paper. interlayer water borehole burial neutron lifetime log pore water high pressure shale smectite well logging density log shallower depth investigation capture cross-section neutron capture cross-section reservoir...

... illite mole expulsion transformation water content shale upstream oil & gas pressure gradient reaction pore water smectite layer smectite interlayer water darcy velocity illite layer reservoir characterization porosity proportion fluid pressure gradient osmotic water...

... ABSTRACT No preview is available for this paper. coefficient high fluid pressure gradient reservoir characterization stress-strain relation reaction 2 equation fluid pressure shale porosity illite mole gradient subsidence rate smectite enthalpy smectite layer pressure...