将断裂后浅海硅质岩的岩石物理异质性和储层岩石类型与其沉积环境联系起来:埃及西部沙漠北部上白垩统巴哈里亚储层

IF 2.2 4区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of African Earth Sciences Pub Date : 2024-08-23 DOI:10.1016/j.jafrearsci.2024.105401
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引用次数: 0

摘要

巴哈利亚地层(Bahariya Formation)的上白垩统碎屑岩层是埃及西部沙漠北部(NWD)的主要储层。这些碎屑岩沉积在以不同规模的储层异质性为特征的准沉积环境中。然而,这些异质性与储层面沉积环境之间的联系仍然模糊不清。在本研究中,我们对西北地区亚西尔油田井中巴哈利亚地层的高度异质储层面进行了研究,以构建最佳储层岩石类型(RRT)和流动带分布的预测框架。地震地层学与岩心沉积学相结合,以了解储层面的沉积结构。此外,还对常规岩心分析和测井曲线进行了解释,以评估不同储层岩石类型(RRTs)中岩性和岩石物理异质性的规模。在所研究的 Yasser 油田中,Bahariya 地层由在各种潮汐影响条件下沉积的潮汐面组成。地震面随潮汐条件的变化而变化很大。最佳储层岩石类型RRT与潮汐通道和混合潮汐条带(RRTI)有关。RRTI岩石是所研究的巴哈利亚储层的主要流体流动通道。岩性和岩石物理异质性在形成 RRTIIII 岩石的潮泥滩和混合潮滩面层中更为突出。将地震与沉积面相联系起来,使我们能够预测研究区域最佳储层流动带的分布。本研究结果建立了一个基于地震、沉积和岩相综合预测最佳储层质量面的框架。该框架可应用于受潮汐影响、孔隙系统异质性高、受沉积控制的类似储层面。
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Linking petrophysical heterogeneity and reservoir rock-typing of the post-rift shallow marine siliciclastics to their depositional setting: The Upper Cretaceous Bahariya reservoirs, north Western Desert, Egypt

The upper Cretaceous clastic facies of the Bahariya Formation host the main reservoir intervals in the north Western Desert (NWD) of Egypt. These clastics were deposited in a parallic depositional environment characterized by different scales of reservoir heterogeneities. However, the link between these heterogeneities and the depositional setting of the reservoir facies is still blurred. In this study, we investigate a highly-heterogeneous reservoir facies of Bahariya Formation in Yasser Field wells, NWD in order to construct a predictive framework for the distribution of the best reservoir rock types (RRTs) and flow zones. Seismic stratigraphy was integrated with core sedimentology to understand the depositional architecture of the reservoir facies. Moreover, conventional core analysis and wireline logs were interpreted to evaluate the scales of lithological and petrophysical heterogeneities in the different RRTs.

In the studied Yasser Field, the Bahariya Formation consists of tidal facies deposited in a wide range of tidally-influenced conditions. The seismic facies varies greatly with variation in the tidal regime. Best reservoir rock types RRTs are associated with tidal channels and amalgamated tidal bars (RRTI). RRTI rocks represent the main fluid flow conduits in the studied Bahariya reservoir. Lithological and petrophysical heterogeneities are more prominent in the tidal mud flat and mixed tidal flat facies which form RRTIII rocks. Linking seismic with sedimentary facies enabled us to predict the distribution of the best reservoir flow zones in the study region. The present results establish a framework for predicting the optimum reservoir quality facies based on integrating seismic, sedimentary and petrofacies. This framework could be applied in analogous tidally-influenced reservoir facies with high depositionally-controlled pore system heterogeneity.

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来源期刊
Journal of African Earth Sciences
Journal of African Earth Sciences 地学-地球科学综合
CiteScore
4.70
自引率
4.30%
发文量
240
审稿时长
12 months
期刊介绍: The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa. The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.
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