Geochemistry at the Rig Site Optimized Reservoir Petrophysical and Fluid Characterization in Riksah and Butain Fields

Advanced wellsite analytical technologies for measuring inorganic elemental and mineral analysis of rock, hydrocarbon components, hydrocarbon isotopic components, and hydrocarbon pyrolysis are proving to be very useful when drilling and completing different type of wells. Experience in different wells have shown that these techniques can be used to assist in predicting rock properties, fluid type, delineating potential pay zones and compartmentalization for reservoir evaluation and further production stages based on rock and chemical properties. A combination of technologies involves instruments for real-time fluid composition analysis using a high resolution hydrocarbon analysis (C1-C8) dissolved in the drilling fluid along with a high resolution Cavity Ring-Down Spectroscopy (CRDS) laser spectroscope for carbon isotopic analysis. Drill cuttings and core chips are also collected and evaluated on well site using X-ray fluorescence (XRF) for the elemental breakdown of the composition of the rock and X-ray diffraction (XRD), which provides the mineralogical composition of the rock. Pyrolysis analysis performed to evaluate residual oil content in source rock (S1), remaining hydrocarbon generation potential (S2) and thermal maturity (Tmax). Furthermore the Thermal Extraction gas chromatography (C9-C25) was performed at well site to evaluate hydrocarbon quality and elaborate fluid quality profile.