Palaeochannle Interpretation and Significancein Oil& Gas Expleration
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摘要: 古河道沉积是一种比较特殊的沉积体，它在地震剖面上的表现形态多种多样，且一般不易识别，必须经过仔细观察和认真分析才能发现。河道有其独特的沉积方式，能形成多种不同类型的沉积砂体，而这些砂体如果接近油源，则有可能成为高产油气藏。我国已在许多油田发现了河道沉积体，其中有些河道砂岩体已打井并获高产油气流。因而如何在地震剖面上识别古河道，一直是地质人员所关注的重要问题。本文通过我国西部某盆地Ｔ凹陷古河道的解释实例，阐明了古河道的沉积特点和在地震剖面上的地震相及反射特征。Abstract: Palaeochannel deposits are a type of special lithosomic body with various forms on seismic profile. I-dentification of the lithosomic body is of difficulty and needs careful observation and detalled analysis.The channel sedimentation is of its own speciality and can form several types of sedimentary sandstoneswhich may be highly productive hydrocarbon reservoirs if they approach source rocks. Channle depositshave been found in many fields in China, and in some of them commercial oil and gas flow of high produc-tion has been discovered by drilling. Therefore, identification of palaeochannel deposition from seismicdata has been an important research subject concerned by many geologists. This paper gave a detaileddiscussion on sedimentary features and seismic facies as well as reflectional characteristics of seismic pro-files of the palaeochannel sedimentation.
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Key words:
- palaeochannel /
- channel sandstone /
- seismic facies /
- lithologic trap
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