Estimation of porosity distribution from formation image logs and comparing the results with NMR log analysis: Implications for the heterogeneity analysis of carbonate reservoirs with an example from the Asmari reservoir, southwest Iran

IF 2.2 4区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Milad Moradi , Ali Kadkhodaie , Mohammad Reza Taheri , Abbas Chenani
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Abstract

Estimating heterogeneity in carbonate rocks is the most important parameter in identifying reservoir and non-reservoir areas. Diagenetic and sedimentary processes directly control reservoir heterogeneity. In this regard, the high hydrocarbon production rate and the reduction of the complexity of the carbonate reservoirs require the evaluation of a new architecture of the reservoir, in which the simultaneous impact of the diagenetic-sedimentary processes on the petrophysical logs is investigated. The current study studies the Oligocene-Miocene Asmari Formation Iran's giant carbonate reservoir. Based on petrographic studies, sedimentary facies, depositional environment and diagenetic processes were characterized. Formation evaluation was conducted to determine lithology, water saturation, fluid volume, and effective porosity. The estimated porosity from the evaluation of the conventional logs (full suite) was compared with the results of estimating the porosity from the NMR T2 distribution curve and the porosity histogram of the image logs. Lorenz's coefficient of heterogeneity was used to understand the heterogeneity of the reservoir. Diagenetic-sedimentary processes and petrophysical logs were used to investigate the pore type and their distribution. The results of petrographic studies, NMR T2 distribution curve, and porosity histogram show that the diagenetic-sedimentary process is the most important factor enhancing the reservoir heterogeneity. Diagenetic and sedimentary processes were traced by evaluating NMR and Image logs. Based on the results, the porosity distribution using the T2 curve and Image show a good agreement. Diagenetic processes mainly dissolution and dolomitization increased the heterogeneity of the main production zones (zones 3 and 4) of the Asmari reservoir that was confirmed using NMR and Image logs.

从地层图像测井中估算孔隙度分布并将结果与核磁共振测井分析进行比较:对碳酸盐岩储层异质性分析的影响,以伊朗西南部阿斯马拉储层为例
估算碳酸盐岩的异质性是确定储层和非储层区域的最重要参数。成因和沉积过程直接控制着储层的异质性。在这方面,碳酸盐岩储层的高碳氢化合物生产率和复杂性的降低要求对储层的新结构进行评估,在评估中研究成岩-沉积过程对岩石物理记录的同时影响。本研究对伊朗巨型碳酸盐岩储层渐新世-中新世阿斯玛里地层进行了研究。根据岩石学研究,确定了沉积面、沉积环境和成岩过程的特征。对地层进行了评估,以确定岩性、含水饱和度、流体体积和有效孔隙度。将常规测井(全套)评估得出的孔隙度估计值与核磁共振 T2 分布曲线和图像测井孔隙度直方图得出的孔隙度估计值进行了比较。采用洛伦兹异质性系数了解储层的异质性。利用成因-沉积过程和岩石物理测井来研究孔隙类型及其分布。岩石学研究、核磁共振 T2 分布曲线和孔隙度直方图的结果表明,成岩-沉积过程是提高储层异质性的最重要因素。通过评估核磁共振和图像测井,对成岩和沉积过程进行了追踪。结果表明,T2 曲线和图像显示的孔隙度分布具有很好的一致性。以溶解和白云石化为主的成岩过程增加了 Asmari 储层主要产区(3 号和 4 号区)的异质性,这一点已通过核磁共振和图像测井得到证实。
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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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