Abstract Chlorite, an Fe-and Mg-rich aluminosilicate clay, may be either detrital or authigenic
in sandstones. Detrital chlorite includes mineral grains, components of lithic grain, matrix …

The genetic identification of different types of natural gas is notably important for assessment
of its sources and exploration potential. The chemical and isotopic (C and H, in particular) …

Biomarkers are compounds found in crude oil with structures inherited from once-living
organisms. They persist in oil spills, refinery products and archaeological artifacts, and can …

The association of dissolved sulfate and hydrocarbons is thermodynamically unstable in
virtually all diagenetic environments. Hence, redox-reactions occur, whereby sulfate is …

Porphyry deposits arguably represent the most economically important class of nonferrous
metallic mineral resources. These magmatic-hydrothermal deposits are characterized by …

Bacterial and thermochemical sulfate reduction apparently occur in two mutually exclusive
thermal regimes, ie, low-temperature diagenetic environments with 0< T< 60–80° C and …

Petroleum deposits form as a consequence of the increased temperatures that accompany
progressive burial of organic matter deep within sedimentary basins. Recent advances in …

The porosity and permeability of sandstone and carbonate reservoirs (known as reservoir
quality) are essential inputs for successful oil and gas resource exploration and exploitation …

The distribution of sulfur isotopes in geological materials reveals information about Earth
history and biogeochemical processes. Research during the last several decades has used …

The economic viability of gas production from deep reservoirs is often limited by the
presence of hydrogen sulphide (H2S) thought to be the result of thermochemical sulphate …