Abstract
The study of tectono-thermal evolution of sedimentary basins reveals both geothermal field characteristics and hydrocarbon generation and expulsion in the basin. However, there are only a few studies on the tectono-thermal evolution of the Fuyang Sag. This means the hydrocarbon exploration in the study area is restricted and unable to be effectively supported. Based on the geophysical exploration and drilling results, the tectono-thermal evolution of the Fuyang Sag has been studied for the first time in this paper. Using the organic geochemical data of the source rocks, the influence of tectono-thermal evolution on hydrocarbon exploration in the Fuyang Sag was discussed. The burial history of the Fuyang Sag since the late Paleozoic falls into four stages: stable sedimentation, rapid subsidence and deposition, long-term continuous uplift and denudation, and sedimentation. The heat flow evolution history of the Fuyang Sag since the late Paleozoic is characterized by ascending first and descending afterward. The main source rocks in the sag increased rapidly during the Permian and was gradually finalized in the Yanshanian period. The Fuyang Sag was reformed after the early hydrocarbon generation. The main source rocks with deeper burial depth, weaker uplift, and denudation reformation have greater potential for hydrocarbon exploration in the sag. The results of this study provide not only a scientific basis and important guidance for hydrocarbon exploration in the Fuyang Sag, and but also effective geothermal constraints for further geodynamics research in the Southern North China Basin.
Highlights
As a driving force of various geodynamic processes (Morgan, 1984; Wang, 1996), heat is an important influencing factor of oil and gas accumulation (Welte and Tissot, 1984; Tissot et al, 1987; Qiu et al, 2004)
1) The burial history of the Fuyang Sag since the Late Paleozoic can be divided into four stages
Long-term continuous uplift and denudation occurred in the Fuyang Sag during the Yanshanian tectonic period
Summary
As a driving force of various geodynamic processes (Morgan, 1984; Wang, 1996), heat is an important influencing factor of oil and gas accumulation (Welte and Tissot, 1984; Tissot et al, 1987; Qiu et al, 2004). Combined with regional geological background, two-dimensional seismic survey, and drilling data, this study reconstructed the stratigraphic burial history of the Fuyang Sag, restored heat flow and formation temperature evolution history of the Fuyang Sag by using vitrinite reflectance measured from drilling cores and cuttings as paleogeothermometers. The Ro values both from cores and cuttings show no significant change with the increase of depth (Figure 4) This indicates that the Carboniferous and Permian vitrinite reflectance data were generally more consistent and had experienced the same thermal evolution history. The Paleogene deposition rate was about 12 m/Ma, and the Neogene deposition rate was about 34 m/Ma. Based on the present-day geothermal field and paleogeothermometer data in the study area, the heat flow evolution history of WFD-1 since the late Paleozoic was systematically reconstructed (Figure 7). In the Himalayan period, the Fuyang Sag was deposited and buried again, the maturity degree did not increase again because the formation temperature experienced by each set of source rocks did not exceed the previous maximum formation temperature
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