Abstract:

As one of the important source rocks in Tarim basin, Yuertusi source rock, whose thermal evolution history is still lacking of objective knowledge which restricting the choice of exploration direction. On the basis of drilling data and analysis test, the Easy%R_o model of basin modeling technology was used to analyze the thermal evolution history and its dissimilarity of Yuertusi source rock in different tectonic units, and the favorable exploration areas were raised, that was important to the further deep carbonate reservoir exploration. The results showed that the source rocks with multiphase and differences dynamic characteristics in thermal evolution were controlled by tectonic movement and hydrothermal activity. The source rock in the ring with depression of Manjiaer and Tanggubasi entered the hydrocarbon generation threshold successively in Ordovician, but the source rock in the Kongquehe slope and eastern Guchengxu uplift entered the stagnation of hydrocarbon generation in Silurian. The Shunxi to Manxi area entered the stage of hydrocarbon generation dried up in Permian and Carboniferous and the range of depletion has gradually expanded. The thermal evolution process of the source rock in the eastern Maigaiti slope significantly was later than that of other areas; it was still in the late mature stage today. The predicted favorable zones were west Shaya uplift, west lower uplift of Shuntuoguole, east Maigaiti slope and west Tanggubasi depression slope.

Key words: Tarim, Yuertusi formation, thermal evolution modeling, exploration favorable area