Geochemical (Thermal) Modeling, Burial History, Oil and Gas Generation of Petroleum System in an oil field in the South-West Iran by Using Pars Basin Modeler (PBM

There are three risks that must be addressed before drilling a well: trap and seal, reservoir and hydrocarbon charge. These three components must be in-place for an exploration, or production well to be successful. Assessing the trap and reservoir risk is routine task of an earth scientist in all hydrocarbon exploration companies. Seismic, well and out crop data provide abundant information that explorationists use to determine quality and viability of these two constituents. Assessing the hydrocarbon charge risk is not routine in all companies. One of the basic objectives of reservoir geochemistry is to deal with hydrocarbon charge within sedimentary basin. Thermal history and burial history reconstruction lead to an estimation of the timing of hydrocarbon generation and expulsion.In this study for thermal modeling method, time-temperature parameters were put together and then, thermal maturity of organic matter (e.g. R0) were calculated through Lopatin’s method simply referred as Time Temperature Index (TTI). Accuracy of calculations was distinguished by comparison between measured and calculated thermal indicators. In addition, the location of oil and gas generation windows and timing of hydrocarbon generation were determined in the study area.According to TTI method the mature source rocks were recognized as Kazhdumi, Gadvan and Garau formations which entered the early maturity region 12, 13 and 35 million years ago respectively and also entered the early maturity region at the depth of 3200, 3150 and 2900 m respectively.General trend of maturity in the field shows an increase suggesting that from north to the south more mature source rocks are located in the southern part of the field.

Keywords:

Source Rock , Thermal Modeling , Lopatin’s Method , Vitrinite Reflection , TTI , Burial History , Azadegan oil field