利用FMI图像研究测井构造断裂对伊朗西南部某油田阿斯马里组储层质量的影响
Effects of tectonic fracture on reservoir quality of Asmari formation in one of south-west Iranian oilfields using formation micro imager image logs
Z.SOLUKI 1M.AZIZZADEH 2A.MAZDARANI 3F.KHOSHBAKHT2
作者信息
- 1. Department of Geology,Islamic Azad University(Tehran North Branch),Tehran,Iran
- 2. Department of Geology,Research Institute of Petroleum Industry(RIPI),Tehran,Iran
- 3. Department of Geology,Islamic Azad University Science&Research Branch,Iran
- 折叠
摘要
裂缝性碳酸盐岩中的储层质量受裂缝性质控制,天然裂缝性碳酸盐岩储层的裂缝系统特征对开发计划非常重要.本文分析了有效构造对波斯湾西北部伊朗Asmari储层油田质量的影响.这些是通过对FMI井眼成像测井(全井眼微成像仪)的分析和解释来完成的.研究的地区是NE-SW趋势背斜;Asmari储层包括两部分(上部和下部)以及它们之间的Ghar砂岩部分.使用Geolog软件处理并校正了研究井的图像测井,然后识别并解释了不同类型的自然结构,并测量了它们的姿态.结构的方向数据已通过绘制统计图(例如罗斯和极图)从结构的角度进行分析.结果表明,该井的层理几乎是水平的.此外,存在不同类型的裂缝和缝合线,它们在结构上可能与褶皱有关.观察到的主要结构可分为:纵向和横向的开放性裂缝,纵向填充的裂缝,与顺层针脚石平行和垂直.用孔隙度测井曲线(即中子,密度和声波测井曲线)对各种类型结构的频率分布进行比较,结果表明,开放的裂缝使孔隙度增加,但填充的裂缝和针孔石的孔隙度大幅度降低.通常,从井的顶部到底部显示的孔隙度增加,即Ghar砂岩段.因此,根据结构对阿斯马里储层质量的影响,建议针对储层的密度和方向(尤其是开放性裂缝)计划在储层中进行任何未来的钻探.
Abstract
In fractured carbonate rocks,reservoir quality is controlled by the fracture properties.Fracture system characteristics in naturally fractured carbonate reservoirs are vitally important to any development plan.This paper analyzes the effect of effective structures on reservoir quality of the Asmari Formation located in one of the Iranian oilfields in NW of the Persian Gulf.These were accomplished using analysis and interpretation of FMI borehole image logs(full bore formation micro imager).The studied field is a NE-SW trending anticline;Asmari Formation contains three parts(upper and lower Asmari)and the Ghar Sandstone section between them.The image log of the studied well has been processed and corrected using Geolog software.Then the different types of natural structures have been recognized and interpreted,and their attitudes were measured as well.The orientation data of the structures have been analyzed by drawing statistical graphs and also from a structural point of view.The results indicated that bedding is almost horizontal in this well.Moreover,different types of fractures and stylolites could be structurally related to folding.The main observed structures could be categorized as longitudinal and transversal open fractures,longitudinal filled fractures,and parallel and normal bedding stylolites.A comparison of the frequency distribution of various structures with porosity logs(i.e.,neutron,density,and sonic logs)shows that the open fractures cause an increase in porosity.However,in some part of the well the filled fractures and stylolites strongly decreased the porosity.Therefore,according to structural impacts on Asmari reservoir quality,it is suggested that any future drillings in the reservoir can be planned concerning the density and orientation of the structures(incredibly open fractures).
关键词
FMI日志/Asmari地层/结构特征/储层质量Key words
formation micro imager log/Asmari formation/structural features/reservoir quality引用本文复制引用
出版年
2023
NETL
NSTL
维普
万方数据