The organic-rich shale intervals of Patala Formation of Paleocene age may be considered as potential shale gas play in the Upper Indus Basin of Pakistan. Until now, seismic and elastic properties of the Patala shales are not investigated in detail necessary to declare it as shale gas play and to differentiate shale gas pay zone from the non-pay zone. Data of eight wells in which Patala shales were encountered at various depth levels from 2000 to 4300 m were deeply investigated for shale gas characterization. This shale fulfills the basic criteria of organic-rich shale with TOC ~ 0.5–5.8%, vitrinite reflectance (level of maturity) is 0.6–1.7%, average thickness 48 m. The brittleness index (BI) of this organic-rich shale was computed by using effective mechanical properties and mineralogy to define brittle zones in the shale intervals preferable for generating the fracture network. BI data points demonstrate that a large number of values fall in the brittle zone, whereas fewer values fall in the ductile zone. However, a certain number of values fall in the brittle–ductile transition zone. The quantitative comparison between different elastic and seismic properties derived from the wireline logs guide for the delineation of the pay zone from the non-pay zone in the organic-rich shale intervals.

巴基斯坦上印度河盆地的古新世帕塔拉组富含有机质的页岩层段可能被认为是潜在的页岩气活动。到目前为止，尚未详细研究Patala页岩的地震和弹性特性，以将其声明为页岩气层并将页岩气产层与非产层区分开来。深入研究了在2000年至4300 m深度范围内遇到Patala页岩的8口井的数据，以表征页岩气。该页岩满足富含有机物页岩的基本标准，TOC约为0.5–5.8％，镜质体反射率（成熟度）为0.6–1.7％，平均厚度为48 m。这种富含有机物的页岩的脆性指数（BI）是通过使用有效的力学性能和矿物学来计算的，以在页岩层段中定义脆性区域，该区域优选用于生成裂缝网络。BI数据点表明，大量值落在脆性区，而较少值落在延性区。但是，一定数量的值落在脆-延性转变区。由测井测井得出的不同弹性和地震特性之间的定量比较指导了在富含机质页岩层段中划定产油区与非产油区的界限。一定数量的值落在脆-延性转变区。由测井测井得出的不同弹性和地震特性之间的定量比较指导了在富含机质页岩层段中划定产油区与非产油区的界限。一定数量的值落在脆-延性转变区。由测井测井得出的不同弹性和地震特性之间的定量比较指导了在富含机质页岩层段中划定产油区与非产油区的界限。