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本文讨论了有关海底扇和湖底扇相模式、砂体的形成及其分布规律。沃克(1978)的海底扇相模式和沉积层序也适用于渤海湾地区下第三系深水碎屑岩的相分析。提出了一个湖底扇相模式由五部分组成,即补给水道、上部扇(包括主沟道、主沟堤和阶地)、中部扇(包括辫状沟道、辫状沟堤、沟间和中心微相)、下部扇和深水平原,简述了各部分的沉积作用。该扇模式有助于预测深水碎屑岩的岩性圈闭和地层圈闭油气藏。在湖底扇的各个部分,上置扇叶状体中的中部扇辫状沟道砂体是最佳的石油储集层;其次,也能够预测补给水道末端和主沟道砂体和砂砾岩体。
This paper discusses the formation and distribution of sand bodies on the submarine fan and sublacustrine fan facies patterns. The seafloor fan facies pattern and sedimentary sequence of Walker (1978) are also suitable for the phase analysis of deep-water clastic rocks in the Lower Tertiary in the Bohai Bay region. Proposed a sublacustrine fan facies pattern composed of five parts, namely, the recharge channel, the upper fan (including the main channel, the main dyke and terraces), the middle sector (including braided channels, braided dykes, ditch and center micro Phase), the lower fan and the deep plain, a brief account of the deposition of various parts. This fan pattern helps predict the lithologic traps and stratigraphic trapped reservoirs in deep-water clastic rocks. In all parts of the sublacustrine fan, the middle fan braided trench sandbody in the upper fan blade is the best oil reservoir; secondly, it is also possible to predict the end of the recharge channel and the main channel sand body and glutenite body .