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首页> 外文期刊>Journal of Petroleum Science & Engineering >Sedimentary characteristics and pattern of distributary channels in shallow water deltaic red bed succession: A case from the Late Cretaceous Yaojia formation, southern Songliao Basin, NE China
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Sedimentary characteristics and pattern of distributary channels in shallow water deltaic red bed succession: A case from the Late Cretaceous Yaojia formation, southern Songliao Basin, NE China

机译：浅水浅水红床中分布式渠道的沉积特征及格局推进：以黄土古鸡南部玉嘉盆地南部南部南部南部

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摘要

Shallow water delta developed during the Late Cretaceous greenhouse climate depositing in the red bed succession of the Yaojia Formation in the Southern Songliao Basin, NE China. The shallow water delta deposits provide an opportunity to understand the influence of high discharge variability in a semi-arid climate on the fluvial patterns, internal sedimentary details, and reservoir quality of distributary channels. The sedimentary process of the shallow water delta in the Yaojia Formation was controlled by a dual-stage process, including a high-flow stage and a low-flow stage within a semi-arid paleoclimate. During the high-flow stage, crevasse channels formed through avulsion of major distributary channels on the delta plain. Subaqueous terminal distributary channels and mouth bars formed at the delta front during progradation of the delta. During the low-flow stage after flood events, crevasse channels were abandoned and frequently exposed becoming reddish in color. This process can be reason for the classification for two main types of distributary channels: major distributary channels and crevasse channels in the delta plain. Sand bodies in distributary channels are distinguished by sedimentary structures indicate critical and supercritical flow conditions. Based on well logs and 3D seismic data, the sand distribution of was analyzed from the sandstone isopach map of the 2nd sand bed in the first member of the Yaojia Formation. The framework sand belts develop coincides with distribution of the major distributary channels. Based on detailed observational and reservoir test data from cores, the distribution of major distributary channels revealed a belt of high-quality reservoirs in the shallow water delta. This study provides a new perspective on the sedimentary pattern of distributary channels in shallow water deltas with high discharge variability, which has important implications for reservoir exploration in lacustrine basins.
机译：浅水三角洲在晚餐温室气候沉积期间开发，在玉鸡盆地南部玉鸡盆地玉米山区的红色成功。浅水三角洲矿床提供了理解在河流模式，内部沉积细节和分销渠道的水库质量的半干旱气候中的高放电可变异性的影响。姚家形成浅水δ的沉积过程由双阶段过程控制，包括高流动阶段和半干旱古古镇的低流动阶段。在高流动阶段，通过在三角形平原上穿过主要分布通道的撕开形成的裂缝通道。在三角洲促成期间在三角洲前部形成的末端终端分布通道和嘴杆。在洪水事件后的低流量阶段，裂缝渠道被遗弃并经常暴露于颜色的红色。这个过程可以是两个主要类型的分销渠道分类的原因：三角洲平原中的主要分销渠道和裂缝渠道。分销通道中的砂体是由沉积结构的特征指示临界和超临界流动条件。基于良好的日志和3D地震数据，在耀家地层的第一件成员的第二砂床的砂岩Isopach地图中分析了砂岩Isopach地图的砂分布。框架砂皮带与主要分销渠道的分布产生一致。基于来自核心的详细观察和水库测试数据，主要分配渠道的分布揭示了浅水三角洲高质量水库带。本研究提供了一种新的浅水倾角沉积模式，具有高放电可变性，对湖泊盆地的水库勘探具有重要意义。

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