PLATE TECTONIC CONTROL OVER THE GEOLOGICAL EVOLUTION OF EXMOUTH PLATEAU AND ITS BEARING ON PETROLEUM ACCUMULATION
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摘要: North Carnarvon盆地位于澳大利亚西北大陆架的南部,是一个自晚古生代至新生代持续沉降形成的巨型含油气盆地,其中Exmouth高地是该盆地主要的地质单元,自2008年以来发现三叠系Mungaroo组气田30个。在对Exmouth高地进行地震资料解释时发现,该区域具有许多特殊的地质现象,如具有大量各异的区域不整合面;断裂系统靠近外缘展布且具有一定规律;三叠系三角洲地层沉积现象特殊等。结合区域地质资料,利用板块运动理论,进一步对上述现象进行了分析和总结。通过对各个时期区域板块间相对位置和相对运动的分析发现,板块运动控制着这个区域的构造沉积演化,进一步控制着区域的油气成藏。通过对板块运动的研究,总结了区域油气勘探的一般性规律。Abstract: The North Carnarvon Basin is located in the northwest part offshore Australia. It evolved from late Palaeozoic to Cenozoic. The Exmouth plateau is one of the biggest tectonic units of the North Carnarvon Basin. Since 2008, 30 gas fields have been discovered in this place. A lot of specific geological phenomena have been discovered when doing seismic interpretation. There have found many regional unconformities, of which some are related to plate motion. The distribution of fault system is regular. Special sedimentation is also found in this basin, such as the special deltaic front. By using seismic and regional geological data, we made integrated study of the geology of the plateau. Plate tectonic affects the evolution of regional geology as well as the distribution of petroleum in this basin.
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Key words:
- Exmouth plateau /
- plate tectonics /
- unconformity /
- fault system /
- geological evolution /
- petroleum distribution
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