TITLE:
Thermal History Simulation Restoration of Burial History of Paleozoic Source Rocks in Western Margin of Ordos
AUTHORS:
Lanxin Zhang, Fengqi Zhang
KEYWORDS:
Ordos Basin, Thermal Evolution, PetroMod, Ro
JOURNAL NAME:
Open Access Library Journal,
Vol.9 No.12,
December
30,
2022
ABSTRACT: The western margin of ordos basin as the main exploration area, because the thermal evolution process of source rocks in the western margin of the basin system research is not deep enough, seriously restricts the evaluation and exploration of oil and gas resources, regional exploration has not been a big breakthrough. In view of this, based on the restoration of burial history and thermal evolution history of source rocks, this paper analyzed and summa-rized the differences in thermal evolution of coal measure source rocks in Taiyuan Formation of different tectonic units in the study area by using PetroMod basin simulation software. The results show that the thermal evo-lution degree of organic matter in the source rocks in the western margin of Ordos presents a zonal distribution from south to north. On the whole, the thermal evolution degree of organic matter in source rocks of different hori-zons in Tianhuan depression is obviously higher than that in the Western margin thrust belt. The maximum Ro value of the source rocks in the Taiyuan Formation of the Western margin thrust belt of the Ordos Basin is 1.0% - 1.4%, and most of them have reached the late stage of mature oil and gas generation and gradually entered the early stage of high mature pyrolysis gas generation. The maximum Ro value of source rocks in the Taiyuan Formation in the west of Tianhuan depression is 1.4% - 2.0%, which reaches the high maturity stage of thermal cracking. This study can provide reference for oil and gas exploration and hydrocarbon accumulation research in the western margin of sedimentary basin.