东营凹陷南缓坡浅水三角洲沉积特征与源—汇过程

发布时间：2018-06-22 12:26

  本文选题：浅水三角洲 + 古地貌　； 参考：《地球科学》2017年11期

【摘要】：源-汇系统研究是当今地质学研究热点.东营凹陷南缓坡沙二段沉积时期是构造稳定的斜坡带,与其物源区广饶凸起构成完整的源-汇系统.基于岩心、测井、分析化验及三维地震资料,精细刻画研究区古地貌形态及沉积物搬运通道,明确沙二段浅水辫状河三角洲沉积特征;通过地震属性与钻井岩性标定,明确沉积体系分布及时空演化关系,探讨沉积主控因素及源-汇体系配置关系.结果表明,物源区自西向东发育i~iii三个汇水单元,及V1~V4四个古沟谷,碎屑沉积物通过古沟谷搬运输送,向滨-浅湖沉积环境的缓坡(0.52°~1.29°)沉积区供源,形成平面上河道频繁分叉改道、垂向上多个正韵律叠置、岩性以分选中等、磨圆较好的含砾砂岩为主的浅水辫状河三角洲沉积.自沙二下亚段沉积期到沙二上亚段沉积期,沉积体向前推进,规模增大,沉积体系垂向演化主要受控于古气候变化导致的湖平面升降.平面上,Ⅰ~Ⅲ沉积区内朵叶体形态及规模受控于源区汇水单元面积、垂向高差及通道形态与规模,朵叶体面积与垂向高差及汇水单元面积呈正相关.
[Abstract]:The study of source-sink system is a hot topic in geology. The sedimentary period of the second member of the south gentle slope of Dongying sag is a stable slope belt, which, with its provenance, Guangrao uplift, constitutes a complete source-sink system. Based on core, logging, analysis of laboratory data and 3D seismic data, the paleogeomorphology and sediment transport channels in the study area are described in detail, and the sedimentary characteristics of shallow water braided river delta in the second member of Shahejie are clarified, and the seismic attributes and drilling lithology are calibrated. The distribution of sedimentary system and the relationship between temporal and spatial evolution were clarified, and the main sedimentary control factors and the relationship between source and sink system configuration were discussed. The results show that from west to east, three catchment units of i~iii and four paleogranes of V1 / V4 are developed in the provenance region, and the detrital sediments are transported through the paleogrid valley and supplied to the gentle slope (0.52 掳/ 1.29 掳) of the shore-shallow lake sedimentary environment. The channel diverts frequently on the plane, and many positive rhythms are overlaid vertically. The lithology of the channel is composed of shallow water braided river deltas, which are mainly gravel-bearing sandstone with medium separation and good grinding. From the sedimentary period of the lower member of the second member to the sedimentary stage of the upper member of the second member, the sedimentary body advances forward and the scale increases. The vertical evolution of the sedimentary system is mainly controlled by the lake level fluctuation caused by the paleoclimate change. On the plane, the shape and scale of the flower leaf body in the 鈪，

本文编号：2052830