路易斯安那近海SS91地层油田的发现和开发

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SS91油田的地层十分复杂,在地震资料上它由某种异常振幅组成,振幅的上倾边界与构造并不相符。该振幅与上中新统砂岩中的油气相对应。为精确预测产油砂岩的分布,随着开发钻探的进展,提出了几种地质模式。这些模式利用了自然电位曲线形态、岩芯和地震特征分析,并结合了计算机模拟研究、工程资料和扫描电子显微镜观察。地质模式的推演经历了四个阶段,从小断层形成的构造圈闭,到产油砂岩的地层尖灭,到河道砂,最后到复合河道砂。最终确立的模式为断裂的地层圈闭。确定井位的开发策略也因未预见到的钻井结果而在逐步修改和完善。最初以特征地震振幅的存在作为布井的依据,后来发现,单单振幅尚不能作为烃类的可靠指示。修改后的开发策略以包括振幅包络和加权频率在内的综合特征分析作为布井的依据。该地层油田的发现和开发要求有地质学、地球物理学和工程学的全面结合。SS91油田证明,复杂的地层油田也足有勘探价值的,而且,运用综合的方法可对之进行成功的开发。 The formation of the SS91 field is very complex and consists of some anomalous amplitude in the seismic data. The upward inclination boundary of the amplitude is not consistent with the structure. This amplitude corresponds to the oil and gas in the Upper Miocene sandstone. In order to accurately predict the distribution of oil-producing sandstone, several geological models have been proposed with the development of drilling. These models make use of natural potential curve patterns, core and seismic characterization, combined with computer simulations, engineering data and scanning electron microscopy. Geological model of the deduction has gone through four stages, from the fault formation of structural traps to the oil-producing sandstone pinch-out, to the river sand, and finally to the composite river sand. The final model for the formation of fractured trap. The development strategy for determining the well location is also gradually being revised and improved due to unforeseen drilling results. Originally, the presence of characteristic seismic amplitude was used as the basis for well drilling, and later it was found that amplitude alone was not yet a reliable indication of hydrocarbon. The revised development strategy is based on comprehensive feature analysis including amplitude envelope and weighted frequency. The discovery and development of this field oil field requires the full integration of geology, geophysics and engineering. The SS91 field proves that complex stratigraphic fields are also valuable for exploration and are successfully developed using a combination of methods.
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