Azadivash Ahmad, Shabani Mehdi, Mehdipour Vali, Rabbani Ahmadreza
Department of Petroleum Engineering, Amirkabir University of Technology, Tehran, Iran.
Heliyon. 2023 Jun 10;9(7):e17204. doi: 10.1016/j.heliyon.2023.e17204. eCollection 2023 Jul.
This study focuses on the intricate process of discerning productive layers within reservoir formations, taking the Sarvak Formation as a primary case. The employed methodology combines geology, comprehensive log interpretations, and petrophysical analyses to facilitate the evaluation of these productive layers. Initially, routine well logs are interpreted to determine key petrophysical parameters such as shale content, porosity, and water saturation. Subsequently, core measurement results are utilized for calibrating these log interpretations. The study further determines cut-off values through a calculated method of 5% cumulative hydrocarbon volume against porosity, shale content, and water saturation. These cut-off values are then applied to the petrophysical results to enhance their reliability. To resolve any inconsistencies or uncertainties in petrophysical evaluation, petrographical analyses, including scanning electron microscope imaging and thin section studies, are employed. The Sarvak Formation is categorized into seven distinct subzones, each thoroughly investigated to ascertain their respective productivity potential. The final results illustrate a substantial heterogeneity within the Sarvak Formation, revealing a range of diagenetic processes including compaction, dissolution, and cementation. Despite this complexity, three subzones are identified as the most productive layers with the maximum net pay, demonstrating the efficacy of the integrated approach.
本研究聚焦于识别储层中生产层的复杂过程，以萨尔瓦克组作为主要实例。所采用的方法结合了地质学、综合测井解释和岩石物理分析，以促进对这些生产层的评估。首先，对常规测井进行解释，以确定关键的岩石物理参数，如页岩含量、孔隙度和含水饱和度。随后，利用岩心测量结果对这些测井解释进行校准。该研究通过针对孔隙度、页岩含量和含水饱和度计算5%累积烃体积的方法进一步确定截止值。然后将这些截止值应用于岩石物理结果，以提高其可靠性。为了解决岩石物理评价中的任何不一致或不确定性，采用了包括扫描电子显微镜成像和薄片研究在内的岩相分析。萨尔瓦克组被分为七个不同的亚带，对每个亚带都进行了深入研究，以确定其各自的生产潜力。最终结果表明，萨尔瓦克组内存在显著的非均质性，揭示了包括压实、溶解和胶结在内的一系列成岩过程。尽管存在这种复杂性，但三个亚带被确定为具有最大净产层厚度的最具生产性的层，证明了综合方法的有效性。
