Introduction . The current regulatory calculation procedure for piles in rocks provides a means to determine the bearing capacity of pile embedded solid rock mass containing no weak interlayers. However, it is not uncommon actual design practice rocky soils be interbedded with softer and less stiff dispersive soils, whose presence affects performance. In this case, summation estimated resistanc...

More percentage of new productions in oil industry is from unconventional oil and gas such as oil shale, tar sand, laminated sand, tight oil (siltstone), tight gas, gas hydrate, and igneous rock, because the conventional oil and gas can no longer meet the need of the world. Researchers in response pay more attentions to the unconventional resources. Formation properties such as total organic ca...

the study area is located in the northeast of iran. miankuhi formation is 500m thick and comprises homogeneous shales, brown granular sandstone and siltstone. in this study, 45 samples were taken from miankuhi shales and sandstones in order to determine their tectonic origin by using a polarizing microscope. samples were analysed by x-ray fluorescence (xrf) method to determine their chemical co...

features of the area. Sills of hornblende-porphyritic clioritc, are part of the Hedley Intrusive suite believed to bc Latf Triassic or Early Jurassi.: (199 Ma based on U-Pb dates 0 ' zircons from the Banbury stock, 3.5 kilometres west o' Hedley). In this location the sills, which vary.from I to 2f' metres in thickness, make up almost 50 per cent '3f thl: stratigraphic column whtxe they intrude ...

A method to estimate C66, which is a shear modulus of a transversely isotropic formation (with its symmetry axis parallel to the borehole), is developed and tested. The inversion for C66 is based upon a cost function which has three terms: a measure of the misfit between the observed and predicted wavenumbers, a measure of the misfit between the current estimate for CBB and the initial guess of...