松辽盆地徐家围子北部宋站地区沙河子组地震相与沉积相解释应用

发布时间：2018-05-21 19:33

本文选题：地震相 + 沙河子组　；参考：《西安石油大学学报(自然科学版)》2017年04期

【摘要】：综合运用岩心、测录井以及地震等资料,对松辽盆地徐家围子北部宋站地区沙河子组层序地层与沉积相类型进行分析,并在此基础上重点研究了该区沙河子组地震相类型、特征及其沉积解释。结果表明,研究区沙河子组可划分4个三级层序,其沉积相类型主要有扇三角洲、辫状河三角洲、湖泊、火山碎屑岩和近岸水下扇等。根据沙河子组地震相外部形态和内部反射结构可划分为前积地震相、杂乱地震相、席状平行-亚平行地震相、发散地震相以及条带反射地震相5大类型。部分可进一步细分,它们通常代表着不同的沉积环境或构造背景。通过剖面地震相-沉积相分析,并结合平面地震相与砂砾岩数据,认为盆地东部缓坡带早期发以育扇三角洲沉积为主,随着盆地范围的扩大,东部缓坡带开始过渡为辫状河三角洲沉积,湖泊沉积主要分布于中央深断带内,西部陡坡带始终以发育扇三角洲沉积为主。
[Abstract]:Based on the core, logging and seismic data, the sequence stratigraphy and sedimentary facies types of Shahezi formation in Songzhan area of northern Songliao Basin are analyzed, and the seismic facies types of Shahezi formation in this area are emphatically studied. Characteristics and sedimentary interpretation. The results show that the Shahezi formation in the study area can be divided into four third-order sequences. The sedimentary facies types are mainly fan delta, braided river delta, lake, pyroclastic rock and nearshore underwater fan. According to the external morphology and internal reflection structure of the seismic facies of Shahezi formation, there are five types of seismic facies, namely, the forward seismofacies, the random seismic facies, the table-shaped parallel subparallel seismic facies, the divergent seismic facies and the strip reflection seismic facies. Parts can be further subdivided and they usually represent different sedimentary environments or tectonic settings. Based on the analysis of seismic facies and sedimentary facies in the section, combined with the plane seismic facies and sandy gravel data, it is concluded that the early occurrence of the gentle slope zone in the eastern part of the basin is dominated by fan-delta deposition, and with the enlargement of the basin scope, The eastern gentle slope belt begins to transition to braided river delta deposit, the lake deposit mainly distributes in the central deep fault zone, and the western steep slope belt is dominated by the developed fan delta deposit.
【作者单位】：中国地质调查局武汉地质调查中心;长江大学地球科学学院;中国石油华北油田公司勘探开发研究院;中国石油华北油田公司采油四厂;
【基金】：国家“十三五”重大科技专项(编号:2016ZX05007-002) 油气资源与勘探技术教育部重点实验室开放基金项目(编号:K2016-07)
【分类号】：P618.13;P631.4

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