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首页> 外文期刊>Arabian Journal for Science and Engineering. Section A, Sciences >Characterizing the Middle–Upper Miocene Reservoir Intervals of a Producing Field in the Niger Delta Basin: An Application of Facies, Sequence Stratigraphic and Petrophysical Analyses
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Characterizing the Middle–Upper Miocene Reservoir Intervals of a Producing Field in the Niger Delta Basin: An Application of Facies, Sequence Stratigraphic and Petrophysical Analyses

机译：尼日尔三角洲盆地某生产区中上新世储层间隔特征：相，层序地层和岩石物理分析的应用

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摘要

Well log and core data were used to carry out detailed facies, sequence stratigraphic, and petrophysical analyses of the "Iota field" in the onshore Niger Delta Basin. The aim was to recognize facies distribution, environments of deposition, stratigraphic framework, reservoir continuity, and property distribution for better understanding of reservoir characteristics across the field. Sedimentological evidence reveals the occurrence of fifteen lithofacies, which were further classified into eight facies associations. The facies associations depict deposition in the offshore, offshore transition, lower shoreface, upper shoreface, estuarine channel, tidal channel, and fluvial channel environments. Sequence stratigraphic analysis reveals the occurrence of three maximum flooding surfaces and three sequence boundaries, which reflect series of transgressive and regressive episodes during the Serravallian-Tortonian age. Two depositional sequences comprising lowstand system tract, transgressive system tract, and highstand system tract packages were recognized. The sand and shale of the fluvial, tidal, estuarine, shoreface and offshore deposits, constitute the reservoir and seal/source rock packages. Correlation indicates that the reservoir packages have good lateral continuity, except where channel incision has occurred. Petrophysical analysis shows that the reservoir units have fair-to-good porosity and good-to-excellent net-to-gross qualities. Dominance of oil-bearing zones were detected at shallow to deeper interval at the northern section of the study area, with few gas-bearing intervals occurring at the intermediate intervals of the southern section. Overall, integrated analytical approach has provided more insight into the facies and reservoir quality distribution, thus reducing subsurface reservoir uncertainties.
机译：测井和岩心数据被用来对尼日尔三角洲陆上陆上的“ Iota油田”进行详细的相，层序地层学和岩石物理分析。目的是认识相分布，沉积环境，地层框架，储层连续性和物性分布，以便更好地了解整个油田的储层特征。沉积学证据表明有15个岩相的发生，这些岩相又被分为8个相。这些相描述了近海，近海过渡，下岸面，上岸面，河口河道，潮汐河道和河道环境中的沉积。层序地层学分析揭示了三个最大洪泛面和三个层序边界的发生，这反映了塞拉瓦利亚-托托尼亚时代的一系列海侵和海退事件。识别出两个沉积序列，包括低位系统道，海侵系统道和高位系统道套。河流，潮汐，河口，岸面和近海沉积物的砂和页岩构成了储层和海豹/烃源岩组合。相关性表明，储层组具有良好的横向连续性，除非发生通道切口。岩石物理分析表明，该储层单元具有良好的孔隙度和良好的净重毛比质量。在研究区的北部，从浅到深的间隔探测到了含油区的优势，而在南部的中间层段，含气层几乎没有出现。总体而言，综合分析方法提供了有关岩相和储层质量分布的更多见解，从而减少了地下储层的不确定性。

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