Paleomagnetic Study on the Oil-Gas Geology of the Ordos Basin

Key words: 
• Ordos Basin /
• Paleomagnetism /
• Oil and Gas resources

Abstract: The results of paleomagnetic research show that the Ordos Basin was located within the paleolatitude of 14°～20°N during the Cambrian and Early-middle Ordovician Periods with a warmer and moist climate, of which the littoral-neritic sedimentary strata in the north and south margins were very rich in organic materials, being favorable fields to find Early Paleozoic oil and gas. From the Late Ordovician to Early Carboniferous, the Ordos Basin may have a large-scale N-S horizontal tectonic displacement. In the Late Carboniferous and Permian Period, the location of Ordos Basin was at around 20°N with widespread limnogenic deposits,being important source rocks of Coal-oil and coal-gas. From the Triassic to Jurassic Period,the Ordos Basin was located at 24°～31°N. And the change of arid and humid climate and the differential tectonic rotations among the Ordos Block and other blocks resulted in favorable conditions for oil and gas formation and accumulation within the marginal areas of the basin. Thus, much more Mesozoic oil and gas reources should be found hopefully.