The Integration of Inorganic and Organic Geochemistry as a Powerful Approach for Evaluating the Generative Potential and Thermal Maturity of the Organic Matter from Lower Triassic Deposits.Case Study: Al-Fayd - Abu Rabah - Al-Sharifa – Tiyas.

Abstract

A comprehensive geochemical analysis of the Lower Triassic deposits was carried out along a section in the Al-Du Basin in central Syria. The section consisted of four fields: Al-Fayd, Abu Rabah, Al-Sharifa, and Tiyas. The evaluation of the deposits was based on ROCK EVAL parameters, which revealed that they contain a significant amount of organic carbon and belong

to the kerogen of Type II. These deposits correspond a transitional zone between the oil and gas windows. Subsequently, a bitumen extraction process was conducted to study its quantitative (hydrocarbon potential and generating capacity) and qualitative (maturity) changes. The results from the ROCK EVAL and extraction tests indicated that the thermal maturity of the organic matter increases from the Al-Fayd field in the southwest to the Tiyas field in the northeast. Furthermore, a separate investigation was conducted to analyze the trace element content and its behavior in each field of the study section. The findings demonstrated the shared geochemical deposition conditions for both the rock and the organic matter, in addition, an increase in the content of rock deposits and organic matter trace elements with decreasing maturity, highlighting their significance and reliability as parameters for determining the relative maturity of organic matter.