Based on a combination of high resolution 3-D seismic, drilling and well logging and core data, this study focuses on describing the depositional features of the Neogene Minghuazhen Formation shallow water delta in Huanghekou area (HHKA), Bohai offshore basin and discussing the evolution and controlling factors of shallow water delta sandbody. An obvious meandering fluvial delta system developed in sequence 1 (SQ1) of the Neogene in HHKA with thinner sandbody of distributary channels and poor development of mouth bar. The sequence texture obviously influences the vertical development and stacking pattern of sandbodies and controls the distribution of sandbodies in plain view as well. In shallow water lacustrine basins, relative topographic height difference leads to change of distribution of accommodation space, and sandbodies of distributary channels usually develop well in local low-lying areas where accommodation space increases. The delta is dominated by distributary channel sandbodies during the early period of base level rising. Sandbodies contact with each other in a lateral stacking pattern and are characterized by a fan shape in plain view. Distributary channels gradually narrow and tend to shift during the mid- late-period of base level rising, while the sandbodies are characterized by a net shape in plain view. During the period of base level slow falling, the multistory/multilateral channel sandbodies dominated the inner front of shallow-water delta and the delta sand dispersal distributes as a lobe shape.

中文翻译：

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渤海盆地黄河口地区新近系明化镇组浅水三角洲发育特征及控制因素分析

本研究结合高分辨率3D地震、钻井和测井及岩心数据，重点描述渤海盆地黄河口地区（HHKA）新近系明化镇组浅水三角洲沉积特征并探讨其演化过程。浅水三角洲砂体的控制因素。HHKA新近系层序1（SQ1）发育明显的蜿蜒河流三角洲体系，分流河道砂体较薄，河口坝发育不良。层序结构明显影响砂体垂向发育和堆积格局，也控制砂体平面分布。在浅水湖盆中，相对地形高差导致可容纳空间分布的变化，分流河道砂体通常发育在当地低洼地区，容纳空间增加。三角洲在基面上升初期以分流河道砂体为主。砂体以横向堆积方式相互接触，在平面视图中以扇形为特征。分流河道在基面上升中后期逐渐变窄并趋于移动，砂体平视呈网状。浅水三角洲内前缘以多层/多支流河道砂体为主，三角洲砂体散布呈叶状分布。三角洲在基面上升初期以分流河道砂体为主。砂体以横向堆积方式相互接触，在平面视图中以扇形为特征。分流河道在基面上升中后期逐渐变窄并趋于移动，砂体平视呈网状。浅水三角洲内前缘以多层/多支流河道砂体为主，三角洲砂体散布呈叶状分布。三角洲在基面上升初期以分流河道砂体为主。砂体以横向堆积方式相互接触，在平面视图中以扇形为特征。分流河道在基面上升中后期逐渐变窄并趋于移动，砂体平视呈网状。浅水三角洲内前缘以多层/多支流河道砂体为主，三角洲砂体散布呈叶状分布。分流河道在基面上升中后期逐渐变窄并趋于移动，砂体平视呈网状。浅水三角洲内前缘以多层/多支流河道砂体为主，三角洲砂体散布呈叶状分布。分流河道在基面上升中后期逐渐变窄并趋于移动，砂体平视呈网状。浅水三角洲内前缘以多层/多支流河道砂体为主，三角洲砂体散布呈叶状分布。