鄂尔多斯盆地陕北地区长8优势砂体富集规律及成因分析
Enrichment Regularity and Genetic Analysis of Chang8 Dominant Sand Body in Shanxi Area, Ordos Basin
DOI: 10.12677/AG.2018.88150, PDF,    国家科技经费支持
作者: 楚美娟, 周新平, 邵晓州, 时孜伟, 左 静:中国石油长庆油田分公司勘探开发研究院,陕西 西安;低渗透油气田勘探开发国家工程实验室,陕西 西安
关键词: 陕北地区长8沉积特征湖岸线迁移规律有利储集砂体Chang8 of Shanbei Area Sedimentary Characteristics The Migration Regularity of the Shoreline Favorable Reservoir Sand Body
摘要: 鄂尔多斯盆地延长组长8沉积期处于三角洲沉积环境,盆地东北部的陕北地区距离物源区较远,湖盆底型较缓,厚层沉积砂体空间分布不均,储层非均质性较强,含油性分布规律比较复杂,勘探难度较大。本文通过大量的岩心观察及泥岩样品分析,结合500余口井的测井曲线特征,从沉积古环境恢复及砂体迁移演化成因入手,理清了陕北地区长8沉积微相类型特征及湖岸线的迁移变化规律,紧密结合陕北地区长8和长9小层暗色泥岩厚度及展布规律,明确了有利储集砂体的分布规律及成因,为陕北长8储层的有效勘探和开发提供地质依据,同时对盆地其它地区的有效储层预测具有借鉴意义。
Abstract: Chang8 sedimentary period was delta sedimentary environment in Ordos Basin. The northern part of the basin is far away from the source area, and the bottom of the lake basin is relatively flat, the spatial distribution of thick sand bodies is uneven, heterogeneity of reservoir is strong, the distribution law of oil bearing is complex, and the exploration is difficult. Based on the sedimentary paleoenvironment and the evolution of sand body migration, this paper clarifies the characteristics of sedimentary microfacies and the migration regularity of the shoreline about Chang8 sedimentary period in Shanbei area through core observation and analysis of a large number of mudstone samples, combined with the characteristics of logging curves of more than 500 wells. It starts from the restoration of sedimentary paleoenvironment and the evolution of sand body migration, and clarifies the characteristics of the Chang 8 sedimentary microfacies and the migration and change of the lakeshore line in northern Shaanxi, and it closely combines the thickness and distribution of dark mudstones of Chang 8 and Chang 9 small layers in northern Shaanxi, and clarifies the distribution law and genesis of favorable reservoir sand bodies. These findings provide a geological basis for the effective exploration and development of the Chang 8 reservoir in northern Shaanxi.
文章引用:楚美娟, 周新平, 邵晓州, 时孜伟, 左静. 鄂尔多斯盆地陕北地区长8优势砂体富集规律及成因分析[J]. 地球科学前沿, 2018, 8(8): 1368-1377. https://doi.org/10.12677/AG.2018.88150

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