Paleomagnetic Study on the Oil-Gas Geology of the Ordos Basin
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摘要: 古地磁研究结果表明，鄂尔多斯盆地寒武纪－早中奥陶世位于北纬１４°～２０°的古纬度区内，气候温暖潮湿，其南部和北部边缘的滨浅海相地层中可能富含生物有机质，是寻找该时期油气资源的有利地区；晚奥陶世－早石炭世，它可能经历了大规模的南北向水平构造迁移；晚石炭世－二叠纪，盆地处于北纬２０°左右地区，广泛发育的湖沼相沉积地层是煤成油、气的主要源岩层；三叠纪－侏罗纪，它位于北纬２４°～３１°，干湿交替的气候环境和差异构造旋转作用，为盆地边缘的油气形成和聚集创造了良好条件，因此有希望找到更多的中生代油气资源。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.
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Key words:
- Ordos Basin /
- Paleomagnetism /
- Oil and Gas resources
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