| The remnant Paleozoic strata are Carboniferous-Permian rocks bordered by Wudi Arch-Binxian Arch-Chenjiazhuang Arches in Jiyang depression, which are separated into the south and the north areas. It is estimated that the thickest strata (nearly 1200m) lies in the west part of Huimin Sag. Source rock include coal measures, calcareous mudstone and dark mudstone,in which Taiyuan and Shanxi coalbeds and dark mudstone are most developed.Three alternated cyclic tectonic evolutions of the source rock were undergone during Indo -Sinian,Yanshanian and Himalayan orogenies.The first hydrocarbon generation occurred during the end of Middle Triassic period,and the second hydrocarbon generation, or the most important period, was during the end of Early Tertiary. The resemblance of Upper Paleozoic thermal history curve with the burial history curve indicates that the tectonicburied process is the main factor controlling the thermal evolution for the source rock. Based on different tectonicburied histories, four different assemblages of tectonic evolution may be classified in Jiyang Depression.Some potential reservoirs favorable to hydrocarbon discovery are suggested. |
