首页> 外文期刊>Petroleum exploration and development >Genetic types and sedimentary model of sandbodies in a shallow-water delta: A case study of the first Member of Cretaceous Yaojia Formation in Qian'an area, south of Songliao Basin, NE China
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Genetic types and sedimentary model of sandbodies in a shallow-water delta: A case study of the first Member of Cretaceous Yaojia Formation in Qian'an area, south of Songliao Basin, NE China

机译:浅水三角洲砂体的成因类型和沉积模式-以松辽盆地南部黔安地区白垩纪姚家组第一段为例

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AbstractBased on outcrop, core, logging and mud logging data, and modern deposition analog, the sandbodies genetic types and spatial distribution in different facies belts of the shallow water delta in the first Member of Cretaceous Yaojia Formation (K2y1) of Qian'an area in Changling sag of southern Songliao Basin were analyzed, and the sedimentary model of shallow water delta was established according to deposition process. Active channel sandbodies, point bar sandbodies and bifurcation bar sandbodies in distributary channels and complex sandbodies formed the main sandbodies in the delta plain, while terminal distributary channels and mouth bar sandbodies formed the main sandbodies in the delta front. The delta prograded gradually under the construction of river mouth and reconstruction of river erosion, the early delta front evolved into delta plain and was reformed by distributary channels, and new delta fronts were formed at the river mouth ahead constantly. Under the control of the above deposition process, the size of main distributary channels in delta plain-delta front declined, while mouth bars developed increasingly. The sandbodies of different genetic types formed framework of river-dominated shallow water delta. The point bar and active channel sandbodies in main distributary channels of the delta, with the best reservoir quality, are lithologic reservoir targets in future exploration.
机译:摘要基于露头,岩心,测井和录井资料,结合现代沉积模拟,研究了迁安地区白垩纪姚家组(K2y1)第一段浅水三角洲不同相带的砂体成因类型和空间分布。分析了松辽盆地南部的长岭凹陷,并根据沉积过程建立了浅水三角洲的沉积模型。三角洲平原的主要河床主体为分布河道中的主动河道砂体,点坝沙洲和分叉河床沙洲,而三角洲前缘的主要河床主体为末级分布河道和河口沙洲。三角洲在河口建设和河流侵蚀重建后逐渐发展,早期三角洲锋面演变成三角洲平原,并经分流河道改造,新的三角洲锋面不断形成。在上述沉积过程的控制下,三角洲平原三角洲前缘的主要分布通道的尺寸减小,而口条逐渐增加。不同遗传类型的沙体形成了以河流为主的浅水三角洲的框架。储集层质量最好的三角洲主要分布河道中的点坝和活动河道砂体是未来勘探的岩性储层目标。

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