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Thermal Evolution and Petroleum-charging Times in the Northeast Area of Ordos Basin

Author: DingChao
Tutor: ChenGang
School: Northwestern University
Course: Mineral prospecting and exploration
Keywords: The northeastern part of the Ordos Basin Mesozoic-Cenozoic Thermal evolution history Hydrocarbon accumulation period
CLC: P618.13
Type: Master's thesis
Year: 2010
Downloads: 254
Quote: 1
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Abstract


Tectonic thermal history of the Upper Paleozoic Gas accumulation period and its relationship hot issue of concern is the the Ordos Basin tectonodynamics research and oil and gas exploration. This article select the period of the Upper Paleozoic gas reservoir characteristics significantly northeastern Ordos basin is a key research areas, on the basis of the northeastern part of the basin unconformity - tectonic events in the evolution and present geothermal field awareness, especially through the apatite fission trace the thermal history simulation, recovery reveals The northeast Cenozoic tectonic thermal evolution history and the use of fluid inclusions indirect dating and since students illite directly given years of methods to explore analysis of The northeast ancient Paleozoic gas's into possession stages and thermal evolution history of the relationship. (1) According to the unconformity strata construction portfolio and its interface to clear the three stages of events and tectonic sequence stratigraphic framework in the Cenozoic unconformity in the northeastern part of the basin, and the tectonic evolution of the Mesozoic basin. (2) Existing geothermal field research results show that the distribution of this ground temperature gradient of the northeastern part of the basin in the 2.7 to 3.0 ℃ / 100m, heat flow changes in 58-70mW/m2 South High North, is mainly controlled by deep heat flux changes. (3) by the thermal history of AFT Solve explore building a tectonic thermal history model of the northeastern part of the Ordos Basin, the middle Yanshanian tectonic thermal events of 120 ± 10Ma exists that the study area. Show that the combination of the paleo-geothermal gradient evolution: the evolution of the northeastern part of the basin has experienced four tectonothermal evolution stage: Triassic - Late Jurassic lower geothermal gradient background under the slow warming constructed hot stage; Late Jurassic - Early Cretaceous high ground temperature gradient background under the rapid warming construct thermal evolution stage; early as chalk World - Palaeogene century higher ground temperature gradient background under the ground temperature gradually trend lower tectonic thermal evolution stage; since the late Paleogene lower ground temperature gradient background under the fast cooling tectonothermal evolution stage. (4) gas-bearing sandstone illite dating years and fluid inclusion geothermometry analysis results show that there are at least: the northeastern part of the basin, Upper Paleozoic three hydrocarbon charging events. Early hydrocarbon charging events occurred in the Late Jurassic, 175-155Ma medium-term oil and gas injection events are mainly concentrated in the Early Cretaceous, 135-125Ma; the late hydrocarbon charging events occurred in the Paleogene 30Ma. (5) by tectonic thermal history of gas accumulation period relativities analysis, the northeastern part of the basin as early Yanshan possession of two Tibetan events closely related, medium-term warming process with the the Upper Paleozoic original angry middle Yanshanian tectonic thermal events are the main factors that contributed to the study area generate large-scale natural gas original possession; late significant the tectonic uplift cooling effect occurs mainly in the area of ??Upper Paleozoic gas adjustment the fugitive and late times to generate 60-30Ma, arising possession.

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