Abstract

Dhodak concession is a part of eastern margin of Sulaiman Fold and Thrust Belt formed as a result of complex transpressional interactions during the Indian-Eurasian collision. Study area reveals the compressional structures that provide suitable hydrocarbon traps of Cretaceous age. Different lithological boundaries and structural properties are identified from 2D seismic, amplitude, and frequency derived seismic attributes. Time and depth structural mapping of the Pab Sandstone (Late Cretaceous) demonstrated an ideal doubly plunging anticlinal structure that represents four way closure for hydrocarbons accumulation in the study area. Observed relatively low-frequency anomaly confirms the hydrocarbon-bearing reservoirs. Since hydrocarbon quantity in a reservoir also depends on the generation potential of source rock, so an attempt has been made to estimate the Total Organic Carbon (TOC) of the source i.e. Sembar Formation. The latter was divided divided into three parts based on the calculated TOC using the Δ log R technique. Upper and lower parts of the Sembar Formation chiefly comprise the lower TOC values (1.90 and 2.1 wt %), whereas the middle part comprises the higher TOC values averaging 3.01 wt %.

中文翻译：

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Dohdak 特许权压缩机制的二维地震解释和早白垩世 Sembar 组的烃源岩评估；巴基斯坦中部印度河流域案例研究

摘要

多达克特许区是苏莱曼褶皱和冲断带东缘的一部分，是印度-欧亚碰撞期间复杂的压挤相互作用的结果。研究区揭示了提供合适的白垩纪油气圈闭的挤压构造。不同的岩性边界和结构特性是通过二维地震、振幅和频率导出的地震属性来识别的。 Pab 砂岩（晚白垩世）的时间和深度结构图显示了理想的双俯冲背斜结构，代表了研究区域碳氢化合物聚集的四向闭合。观测到的相对低频异常证实了含油气储层。由于储层中的烃量还取决于烃源岩的生成潜力，因此尝试估算烃源岩（即Sembar组）的总有机碳（TOC）。后者根据使用 Δ log R 技术计算的 TOC 分为三个部分。 Sembar 地层的上部和下部主要包含较低的 TOC 值（1.90 和 2.1 wt%），而中部包含较高的 TOC 值，平均为 3.01 wt%。