Method for determining the content, quality and maturation of organic matter in marine environment for exploration of oil wells

A method for determining a content, quality and maturation of organic matter in a marine environment for exploration of oil wells, the method comprises:

• i) performing (multi) one dimensional one-dimensional or multi-dimensional simulation of the content and quality of total organic carbon in marine sedimentary basins along a chronostratigraphic profile of an exploratory well;
• ii) grouping environmental variables in a structure of biological matter production equations in the marine environment, transport rates, decay towards ocean floor and efficiency with which it is buried;
• iii) determining a terrestrial organic carbon (COte) transfer regime for a marine site under analysis, in which terrestrial fractions referring to kerogen (qCO) and residual carbon (rCO) are estimated from sand fraction (SF), where therCO is calculated from an equation of rCO=a*SF+b in which a and b are constants and the qCO comes from a conditional logic where if SF<75%, qCO=a*SF, and if SF>=75%, qCO=a*SF+b;
• iv) designating a preservation factor (PF) associated with generation of an anoxia interval at the site under analysis, which enhances conservation of the organic matter along its depositional route;
• v) defining a quality of organic matter from a three-source mixture model;
• vi) calculating values of hydrogen index, oxygen index and carbon isotopic signature along the profile of the exploratory well;
• vii) performing one-dimensional or multi-dimensional simulation of maturity of organic matter in sedimentary basins and categorizing this matter into indices of amount, quality and maturity, and evaluating advanced diagenesis and catagenesis processes to determine a generator potential of oil and/or natural gas;
• viii) selecting laboratory tests that provide starting estimates for the maturity process of the organic matter;
• ix) evaluating characteristics of the organic matter related to its amount, quality, stage of thermal maturation and relative potential to generate hydrocarbons;
• x) grouping data referring to the total organic carbon and a peak in a Rock Eval gradual heating diagram that represents generation of hydrocarbons by cracking of kerogen in the sample (S2) for determination of active and inert fractions of the total organic carbon to determine geochemical parameters of maturation of the organic matter to expand oil exploration to deep marine environment.