三角洲改造背景的浪控滨岸砂体成因类型及展布特征——以塔里木盆地东河塘地区“东河砂岩”为例

发布时间：2018-04-02 23:34

本文选题：塔里木盆地　切入点：东河砂岩　出处：《中国海洋大学学报(自然科学版)》2017年09期

【摘要】：塔里木盆地的东河砂岩体并不是简单的滨岸沉积产物,在不同地区具备独特的沉积背景,发育不同模式控制的砂体。根据钻井、测井和地震等资料,通过塔里木盆地东河1油田实例研究,揭示了该地区浪控滨岸砂体的沉积机制和分布样式。结果表明,东河塘地区东河砂岩沉积发育具有三角洲改造背景的浪控滨岸沉积体系,其形成源于区域上的浪控三角洲背景,海侵期遭受波浪及沿岸流的强烈改造,形成现今的滨岸沉积体系。在此基础上,将改造作用最明显的临滨带砂体按成因类型进一步分级,提出了临滨坝的三类砂体组成单元:正常滨岸沉积型、水下分流河道改造型以及河口坝改造型。同时,对其分布及演化进行了探讨,认为正常滨岸沉积的滩坝砂体整体呈相对席状平行于古海岸线分布,在局部构造较低部位形成不规则窄条带状的临滨槽沉积;三角洲前缘改造型滨岸砂体兼具原始三角洲和现代滨岸沉积的形态特征,原始水下分流河道砂体自北东方向呈树枝状向海延伸;河口砂坝在原始水下河道河口处呈舌状分布;席状砂发生明显侧向迁移、以片状分布。
[Abstract]:The Donghe sandstone body in Tarim Basin is not a simple coastal sedimentary product. It has unique sedimentary background in different areas and has developed sand bodies controlled by different models.Based on the drilling, logging and seismic data, the sedimentary mechanism and distribution pattern of the wave-controlled shoreline sand bodies in the Tarim Basin are revealed through a case study of Donghe 1 Oilfield in the Tarim Basin.The results show that the donghe sandstone deposits in Donghetang area have developed a wave-controlled shoreline sedimentary system with a delta retrofit background, which originated from the regional wave-controlled delta setting and was strongly transformed by waves and coastal currents during the transgression period.Forming the present shoreline sedimentary system.On the basis of this, the sand bodies of the most obvious reconstructing zone are further classified according to their genetic types, and three types of sand body composition units are proposed: normal shoreline sedimentation type, underwater distributary channel reconstruction type and estuarine dam reconstruction type.At the same time, the distribution and evolution of the sand bodies are discussed. It is considered that the sand bodies of the normal shoreline deposits are relatively flat parallel to the paleocoastline, and the irregular narrow strip-shaped riparian deposits are formed in the lower part of the local structures.The remade shoreline sand body in the front of the delta has the morphological characteristics of both the original delta and the modern shoreline sediment, the original underwater distributary channel sand body extends from the north to the east direction towards the sea, and the estuary bar distributes like a tongue at the mouth of the original underwater channel.Sheet sand has obvious lateral migration and distributes in flake shape.
【作者单位】：中国石油大学(北京)地球科学学院;国家海洋信息中心;中国石油塔里木油田分公司勘探开发研究院;中国石油勘探开发研究院;中国石油西南油气田分公司;
【基金】：国家科技重大专项“复杂油气藏精细表征与剩余油分布预测”项目(2011ZX05009-003)资助~~
【分类号】：P618.13

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