Evaluation of Gas Potential in Early Cretaceous Shale Lower Indus Basin, Pakistan

B. Ahmed, M. Mohibullah, S. Jalal, S. Abbasi, Abdul S. Khan, S. Alam, H. Rehman
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Abstract

The shale gas potential of the early Cretaceous Talhar shale member of the lower Goru Formation in lower Indus basin of Sanghar district, Sindh province, has been evaluated using 2D seismic and well logs data. Graphical and empirical techniques were applied to calculate various geochemical parameters for the evaluation of shale plays. Total Organic Carbon (TOC) is calculated by Passey's (∆LogR) Overlay technique and its values are about 2.44 wt.%. Vitrinite Reflectance (Ro) is estimated by graphical and empirical relation and the value lies between 0.95-1.0 which implies that the Talhar shale member is in peak oil and initial gas generation phase. Log-derived Maturity Index (LMI) is calculated by NPHI, RHOB or density log and uranium logs. The average value is about 0.55 which reflects that the formation is probably in the initial maturation phase. Kerogen Volume (Vk) is estimated by empirical relation using RHOB log as input and it is about 13 wt. % which reflects that the formation has enough potential of oil/gas expulsion. The results are compared and validated with a study of the adjacent field of the same basin. This study reveals that Talhar member of lower Goru Formation could be the future probable potential unconventional reservoir for exploration in lower Indus basin of Pakistan.
巴基斯坦下印度河盆地早白垩世页岩气潜力评价
利用二维地震资料和测井资料,对信德省Sanghar地区下印度河盆地早白垩世下Goru组Talhar页岩段的页岩气潜力进行了评价。应用图解法和经验法计算了各种地球化学参数,用于页岩储层评价。总有机碳(TOC)由Passey's(∆LogR)覆盖技术计算,其值约为2.44 wt.%。镜质体反射率Ro值在0.95 ~ 1.0之间,表明塔哈尔页岩段处于油气期和初生气期的峰值阶段。测井衍生成熟度指数(LMI)由NPHI、RHOB或密度测井和铀测井计算。平均值约为0.55,反映地层可能处于初始成熟阶段。以RHOB测井为输入,通过经验关系法估计干酪根体积(Vk)约为13 wt. %,反映了地层具有足够的排油/排气潜力。将研究结果与同一盆地邻近油田的研究结果进行了比较和验证。研究表明,下Goru组Talhar段可能是巴基斯坦下印度河盆地未来勘探的潜在非常规储层。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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