Abstract Anisotropies exist in many sedimentary rocks, particularly naturally fractured reservoirs, causing horizontal stress anisotropies. Case studies indicate that when a rock formation contains high dip-angle fractures or factures (e.g. bedding planes), it has very distinguished stresses. In these cases, the conventional isotropic method for estimating stresses may give erroneous results. U...

Alongside volcanic eruptions in the middle and late Permian, sedimentary environment process changed, lithofacies mineralogical characteristics varied conspicuously from marine sediments this period. Marine tuffaceous rocks beared strong witness to actions time. With experimental studies relying on field outcrop, thin section, scanning electron microscope, X-ray diffraction (XRD), mercury injec...

The study of organic matter content and composition in source rocks using the methods geochemistry is an important part unconventional reservoir characterization. aim this work was structural group analysis directly rock combination with a quantitative assessment surface distribution sample by FTIR spectroscopy microscopy. We have developed new experimental procedures for semi-quantitative cont...