东营凹陷北部陡坡带利563区块沙四上亚段砂砾岩扇体沉积特征及沉积模式

doi:10.13278/j.cnki.jjuese.20190061

摘要/Abstract

摘要： 东营凹陷北部陡坡带发育的大量砂砾岩扇体在油气勘探与开发中占据重要地位。本文研究针对东营北带利563区块沙四上亚段砂砾岩扇体及其中发育的重力流沉积，通过岩心精细描述，依据岩性、粒度、构造将砂砾岩扇体划分出12种岩相。然后以发育相同水动力条件为单元，依据岩性和沉积机理将岩相在垂向上进行组合，划分8种水动力类型和8种岩相组合类型。再基于砂砾岩沉积的空间分布、尺度大小、接触关系和根据沉积物中泥岩的结构、纹理所细分出的7种泥岩类型所代表的各种环境，定义了5种砂砾岩扇体沉积形态特征：近端厚层砾石沉积、限制性水道沉积、非限制性舌状体沉积、非河道薄层沉积、远端细粒沉积。认为该区砂砾岩扇体为近岸水下扇，包括扇根沟道、沟道间、扇中辫状水道、水道间、扇中前缘、扇端泥6种沉积微相类型并归纳其综合鉴定特征。最终建立本区砂砾岩扇体的沉积过程和沉积模式。

关键词: 砂砾岩扇体, 沉积特征, 沉积模式, 沙四上亚段, 东营凹陷北部陡坡带

Abstract: A large number of glutenite fans are developed in the north steep slope of Dongying depression;which is important in oil and gas exploration and development. In this paper, we focus on the sand-bearing conglomerate fan body and its gravity flow sedimentation in the north member of the No. 563 block in the northeast part of Dongying. Through the fine description of the core, the glutenite fan body is divided into eleven facies by lithology, grain size,and structure;then, with the same hydrodynamic conditions as the unit, according to lithology and sedimentary mechanism the lithofacies are combined vertically into eight hydrodynamic types and eight lithofacies combination types. Based on the spatial distribution, scale, contact relationship,and various environments represented by the seven types of mudstone subdivided by the structure and texture of the mudstone in the sediment, five types of sediments are defined for the glutenite fan:thick gravel deposits at the proximal end, restricted water channel deposit, unrestricted tongue deposit, non-channel thin layer deposit, and distal fine grain deposit. Based on a comprehensive analysis of features,six sedimentary microfacies types are identified,including fan root channel, channel, fan-shaped water channel, water channel, fan front edge,and fan end mud. It is believed that the glutenite fan in this area is a near-shore submerged fan. On the basis above, the sedimentary process and sedimentary model of the glutenite fan in this area are finally established.

Key words: glutenite fans, sedimentary characteristics, sedimentary model, Upper Es₄, north steep slope of Dongying depression

中图分类号:

TE121.2

王鑫, 林承焰, 马存飞, 陈柄屹, 杜凯, 李志鹏. 东营凹陷北部陡坡带利563区块沙四上亚段砂砾岩扇体沉积特征及沉积模式[J]. 吉林大学学报(地球科学版), 2020, 50(3): 705-720.

Wang Xin, Lin Chengyan, Ma Cunfei, Chen Bingyi, Du Kai, Li Zhipeng. Sedimentary Characteristics and Sedimentary Model of Glutenite Fans in Upper Es₄ in L563 Area,North Steep Slope of Dongying Depression[J]. Journal of Jilin University(Earth Science Edition), 2020, 50(3): 705-720.

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