Abstract: Method of characterizing the chemical signature of petroleum oil contained in reservoir rock for the purpose of production allocation, estimation of vertical drainage, and monitoring of production. Reservoir rock samples from petroleum pay zones are cleaned from surface contaminations, and then loaded with water into pressure vessels and seals to airtight. The vessels are heat treated with elevated pressure to release trapped oil. Oil is extracted from the products from the vessels and analyzed for chemical compositions. The measured compositions of extracted oils are used to construct geochemical fingerprinting for the characterization of fluid-in-place in the pay zones.

Abstract: Methods and systems for assessing permeability, porosity, and production fluids pressure or analyzing reservoir fluids in connection with a drilling operation are provided, comprising collecting from a series of depths mud gas samples and reservoir cuttings of a minimum size; allowing the cuttings to evolve a headspace gas within one or more time delays to obtain headspace gas samples; determining within the time delay carbon isotope ratio differences between the mud gas and headspace gas samples; and identifying the depths having isotope ratio differences smaller than those from nearby depths.

Abstract: The present application provides a method for determining one or two parameters of a sensor system for detecting a gaseous sample. The sensor system comprises a light source to generate a light beam, a hollow waveguide to receive the light beam and the gaseous sample, and a detector to detect an absorption peak of the gaseous sample, where the length and inner diameter of the hollow waveguide satisfy relationships as disclosed herein.