远源细粒辫状河三角洲沉积特征与单砂体构型分析

发布时间：2019-05-06 17:54

【摘要】：应用研究区丰富的取心井及密井网资料,对老君庙油田L油藏远源细粒辫状河三角洲分流河道和河口坝单砂体进行表征并明确其内部结构样式,建立远源细粒辫状河三角洲的沉积构型模式。研究表明:缓坡、距物源较远是远源细粒辫状河三角洲发育的必要条件,沉积粒度较细、沉积构造规模及单一河道砂体厚度较小是其较明显的沉积特征;远源细粒辫状河三角洲平原分流河道呈交织近连片型和交织条带型两种组合样式,其中交织近连片分流河道由主干分流河道不断分叉合并而成,分流河道演化主要有3种模式,经历3个阶段,早期典型分流河道孤立分布,中期河道以决口演化模式为主成交织状分布,末期以侧向侵蚀和河道间岔口冲刷演化模式为主成近连片分布;远源细粒辫状河三角洲前缘河口坝呈大面积近连片分布,其由不同期单一河口坝拼接叠置而成,前缘演化初期以坝边部部分侧向拼接样式为主,演化中期坝边部完全侧向拼接样式较常见,至演化末期河口坝间呈现坝主体完全垂向叠置和坝主体部分垂向叠置的样式。
[Abstract]:Based on the abundant data of coring wells and dense well patterns in the study area, the authors characterize the distributary channel of the braided river delta and the single sand body of Hekou dam in L reservoir of Laojunmiao Oilfield, and define the internal structure pattern of the distributary channel and estuary dam single sand body. The sedimentary configuration model of the distant fine grain braided river delta is established. The results show that the gentle slope and the distance from the provenance are the necessary conditions for the development of the distant fine grain braided river delta, and the fine grain size of the sediment, the small size of the sedimentary structure and the thickness of the single channel sand body are the obvious sedimentary characteristics. The distributary channels of the braided delta plain of the far-source fine grain are interlaced and interlaced strip-type, in which the interweaved near-connected distributary channels are composed of the main distributary channels and merged continuously, and there are three main models of distributary channel evolution. Through three stages, the typical distributary channel is isolated in early stage, in the middle stage it is dominated by break evolution model, and the late stage is dominated by lateral erosion and inter-channel fork erosion evolution model. The distal fine grain braided river delta front estuary dam is distributed in a large area, which is composed of a single estuarine dam splicing at different stages, and the initial stage of the front evolution is dominated by the lateral splicing pattern of the dam edge part. In the middle stage of evolution, the complete lateral splicing pattern of the dam edges is more common, and at the end of the evolution, the dam main body is completely vertically superposed and the dam main body part is vertically superposed between the dams at the end of the evolution period.
【作者单位】：中国石油勘探开发研究院;中国石油大学地球科学学院;中国石油玉门油田分公司勘探开发研究院;
【基金】：国家重大科技专项(2016ZX05010-005) 中国石油天然气集团公司重大科技专项(2013E-3305)
【分类号】：P618.13

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