博兴洼陷沙四段下亚段红层油气成藏特征及勘探潜力分析
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摘要
胜利油区博兴洼陷沙四段下亚段广泛发育陆相红层。根据地化、钻井岩心等资料,结合地震相、古地形特征及陆相沉积体系的时空展布规律,认为红层岩性主要为红色、褐色砂岩、泥岩互层,是一套形成于滨浅湖背景下的洪水漫湖沉积。红层的油藏分布规律为:①构造背景控制油气运移的主要指向,油气主要集中在鼻状构造的较高部位;②受沉积影响,储层在横向上及纵向上的变化较快,储层平面特征决定油气的富集程度;③油源断层的断距决定油气输导体系的有效性,由于红层本身不具备生烃能力,油源断层的落差要大于150m,才能使上升盘的储层与下降盘的油源实现对接成藏。弄清红层油气藏成藏规律不仅能够从理论上指导博兴洼陷红层油气藏的勘探与生产,同时也对其他地区的红层研究具有普遍的借鉴意义。
The land facies red beds are developed broadly in the lower member of the Es4 in Boxing subsag in Shengli exploration area. The lithologies of the red bed are red, brown sand and mudstone interbed, it is a set of deposit of sheetflood of lake water according to the geochemical data, core data and combined with the seismic facies, ancient landform features and the distribution rules of the continental deposit system. the distribution rules of the red bed are: ① the hydrocarbon migration directions were controlled by structural setting, the hydrocarbon were centralized at the high of the nose, ② effected by the deposit, the reservoirs changed quickly in horizontal and vertical, the level of the petroleum concentration depended on the reservoir horizontal feature, ③ the validity of hydrocarbon transportation system depended on the amplitude of the oil sources fault, because the red beds were not able to generate the hydrocarbon itself, the oil sources in the upper and the lower could be connected to form reservoirs when the drop height of the oil source fault was over 1500m. Making certain of the reservoir forming of the red bed can theoretically guide not only the exploration and development in Boxing, but also the red bed research in other area.
The land facies red beds are developed broadly in the lower member of the Es4 in Boxing subsag in Shengli exploration area. The lithologies of the red bed are red, brown sand and mudstone interbed, it is a set of deposit of sheetflood of lake water according to the geochemical data, core data and combined with the seismic facies, ancient landform features and the distribution rules of the continental deposit system. the distribution rules of the red bed are: ① the hydrocarbon migration directions were controlled by structural setting, the hydrocarbon were centralized at the high of the nose, ② effected by the deposit, the reservoirs changed quickly in horizontal and vertical, the level of the petroleum concentration depended on the reservoir horizontal feature, ③ the validity of hydrocarbon transportation system depended on the amplitude of the oil sources fault, because the red beds were not able to generate the hydrocarbon itself, the oil sources in the upper and the lower could be connected to form reservoirs when the drop height of the oil source fault was over 1500m. Making certain of the reservoir forming of the red bed can theoretically guide not only the exploration and development in Boxing, but also the red bed research in other area.
引文
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