Estimation of Total Organic Carbon and Depositional Model of Paleocene Patala Formation Western Salt Range, Pakistan

IF 0.1 Q4 ENGINEERING, CHEMICAL Journal of the Pakistan Institute of Chemical Engineers Pub Date : 2021-01-21 DOI:10.54693/piche.04821
Abdul Hafeez, Rizwan Sarwar Awan, A. Salaam
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Abstract

In this research, we estimated the total organic carbon and presented a paleo depositional model of the Paleocene Patala Formation from the western Salt Range of Pakistan. Results shows, during the Paleocene period, the Patala Formation was settled in barrier-island or in back-barrier depositional environments. This evidence is on the basis of lithofacies analysis and TOC determination data from measured stratigraphic sections. According to lithofacies analysis and the TOC estimation of the Patala Formation, the carbonaceous shale deposits of Western Salt Range at Khairabad, Chitta Wahan, and the Kalri area were deposited in back-barrier marshes. In the study area, the Patala Formation 16 meter thick. Based on detailed outcrop investigation, we have divided the Patala Formation into five different lithofacies, i.e., grey shale, carbonaceous shale, sandstone, limestone, and a mixture of sandstone and shale facies. The TOC was measured with the help of a wet combustion titration method. Carbonaceous shale and grey shale lithofacies contain an average of 3.64 % and 1.39 % of TOC value, respectively. Results show moderate to very good TOC values in the shales of Patala formation, which indicates that Patala Formation in the Western Salt Range has a good source rock potential to generate hydrocarbon.
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巴基斯坦西部盐岭古新世Patala组总有机碳估算及沉积模式
本研究估算了巴基斯坦西部盐岭古新世Patala组的总有机碳,建立了古沉积模式。结果表明,古新世时期,帕塔拉组沉积于障壁岛或障壁后沉积环境。这一证据是基于岩相分析和测量地层剖面的TOC测定数据。通过岩相分析和Patala组TOC估算,发现西部盐岭Khairabad、Chitta Wahan和Kalri地区的碳质页岩沉积在屏障后沼泽中。在研究区内,帕塔拉地层厚度达16米。在详细的露头调查基础上,将帕塔拉组划分为灰色页岩、碳质页岩、砂岩、灰岩和砂岩与页岩混合5种不同的岩相。采用湿式燃烧滴定法测定TOC。碳质页岩岩相和灰质页岩岩相平均TOC值分别为3.64%和1.39%。结果表明,帕塔拉组页岩TOC值中等至非常好,表明西盐岭帕塔拉组具有良好的烃源岩生烃潜力。
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