远源、细粒型浅水三角洲沉积特征与演化——以准噶尔盆地腹部莫索湾地区八道湾组为例

发布时间：2018-06-15 14:23

本文选题：准噶尔盆地 + 莫索湾地区　；参考：《沉积学报》2016年01期

【摘要】：准噶尔盆地腹部中央坳陷莫索湾地区八道湾组沉积时期气候相对湿润,地形相对平缓,物源供给充足,湖岸线变化相对频繁,具备形成浅水三角洲有利条件;由于距离物源区较远,沉积砂体以细砂岩、中—细砂岩为主,粒度相对较细,垂向上形成多期正旋回沉积序列。三角洲前缘分布广、延伸长、面积大,平面主要呈朵状,由多期水下分流河道切割、叠置形成的复合砂体构成;水下分流河道砂体发育,厚度较大,数量众多,垂向相互叠置,横向互相切割,连通性较好,单砂体具有不同叠置方式,构成了主要油气储集砂体,泥岩隔层较薄,河口坝砂体不发育;总体上,形成了该区远源型、分布广、粒度较细的浅水曲流河三角洲沉积体系。不同的沉积时期,来源于两个物源方向的三角洲前缘和水下分流河道沉积形态和范围发生变化,最终形成由宽阔的复合河道砂体为主构成的浅水三角洲。
[Abstract]:The Badaowan formation of Mosuowan area in the central depression of Junggar basin has a relatively humid climate, a relatively gentle topography, a sufficient supply of provenance and frequent changes of the lacustrine line during the sedimentary period, which has favorable conditions for the formation of shallow water deltas. Because of the distance from the source area, the sedimentary sandbodies are composed of fine sandstone, medium fine sandstone and relatively fine grain size. The delta front has a wide distribution, a long extension and a large area, and the plane is mainly in the shape of a flower, which is composed of a composite sand body which is cut and superimposed by a multi-stage underwater distributary channel, the sand body of the underwater distributary channel is developed, the thickness is large, the quantity is numerous, and the vertical distribution channel is superimposed on each other. Transverse cutting, good connectivity, different superposition of single sand body, forming main oil and gas reservoir sand body, thin mudstone barrier layer and undeveloped estuarine bar sand body, in general, formed the far source type and wide distribution in this area. A fine-grained shallow meandering river delta sedimentary system. In different sedimentary periods, the depositional form and range of delta front and underwater distributary channel from two source directions changed, and the shallow water deltas composed mainly of broad composite channel sand bodies were formed.
【作者单位】：中国石油新疆油田分公司勘探开发研究院;
【基金】：国家重点基础研究发展计划(973计划)项目(2011CB201106) 国家科技重大专项(2011ZX05001-006)~~
【分类号】：P618.13

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