A method for estimating comprehensive gas diffusion coefficients for a sandstone and mudstone combination using acoustic interval transit time is proposed.

Porosity and permeability of sandstone near the sandstone-mudstone boundary is affected by the stacking pattern of sandstone and mudstone.

The theoretical and expe-rimental comparison of three effective medium resistivity models in laminated and dispersed shaly sands is addressed in d.

Research on rock mechanic characteristics of slight weather argillaceous sandstones in Sichuan Basin;

But the clean sand model through which we can calculate for- mation water resisitivity is unsuitable for argillaceous sandstone.

The argillaceous sandstone reservoir has a large distributed area in Linnan oilfield.

Generalized matrix-conducting pore combination resistivity model in laminated and dispersed shaly sands;

Experimental research of dispersion properties on shaly sands with different fluid properties is the petrophysical basis to evaluate the water cut or low resistivity oil-bearing formation using complex resistivity logging technique.

The complex resistivity of patial-water saturated shaly sands has been investigated under reservoir condition.

The experiment of NMR characteristics of shaly sand under different salinity;

Establishment of dual water conductivity model for laminated and dispersed shaly sands;

Experimental research on electrical properties of shaly sand under different sal inity.;