Oilfield Review Summer 2011: 23, no. 2. Copyright © 2011 Schlumberger. For help in preparation of this article, thanks to Nicholas Drenzek, Cambridge, Massachusetts, USA. FLAIR is a mark of Schlumberger. Rock-Eval is a mark of the Institut Français du Pétrole. Rock-Eval 6 is a mark of Vinci Technologies SA. Every oil or gas play originates from source rock. The viability of each play—convention...

Geothermal energy is a form of renewable with long tradition in European countries, although it scarcely used Spain. One the reasons for this poorly studied geothermal potential Spanish territory. In recent years, data published on terrestrial gamma radiation and geochemistry radioisotopes rocks have suggested that radiogenic heat production (RHP) some areas Spain high. work, we assessed RHP by...

Early Cambrian volcanic rocks of the Posht-e Badam tectonic block in Central Iran which is hydrothermally altered to green color rocks, hosts the Kiruna-type Iron Oxide-Apatite (IOA) mineralization in Anomaly 10 of Sechahun deposit. Geochemically, these volcanic rocks are classified as high-potassium calc-alkaline and mainly consist of rhyolite and trachyandesite. These rocks are important for ...

A 4-yr study of spatial and temporal variability in the geochemistry of vadose groundwaters from caves within the Edwards aquifer region of central Texas offers new insights into controls on vadose groundwater evolution, the relationship between vadose and phreatic groundwaters, and the fundamental influence of soil composition on groundwater geochemistry. Variations in Sr isotopes and trace el...

We report geochemical data of apatites from Mesozoic granitoids in the northeastern North China Craton (NCC), and discuss relationship between apatite whole-rock compositions with aim using to constrain granitoid petrogenesis. Measured Sr contents Sr/Y ratios exhibit positive correlations those their host rocks, εNd(t) values display a strong linear εHf(t) zircons granitoids. In addition, simil...

Petroleum is a mixture dominantly of hydrocarbons with varying proportions of non-hydrocarbon constituents and traces of organometallic compounds. Generally Petroleum has an average composition of 85% carbon, 13% hydrogen, and 2% of sulphur, nitrogen and oxygen. Organic geochemistry can be defined as the study of the fate and distribution of carbon compounds in contemporary environments, in Rec...

Crude oils and source rocks from the northern and offshore Niger Delta basin, Nigeria, have been characterized by gas chromatography-mass spectrometry in terms of their origin and thermal maturity based on the distribution of chrysene and its derivatives. The crude oils and source rocks were characterized by the dominance of chrysene over benzo[a]anthracene. 3-methylchrysene predominated over o...