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Evaluation of Organic Matter Richness of Eocene Strata Based on Calcareous Nannofossils and Rock-Eval Analysis in North Dezful, Iran
Journal of Earth Science ( IF 3.3 ) Pub Date : 2021-08-15 , DOI: 10.1007/s12583-020-1091-6
Mohammad Parandavar 1, 2 , Jalil Sadouni 1
Affiliation  

Hydrocarbon source potential of the Paleogene Pabdeh Formation was studied by means of organic geochemistry and distribution of calcareous nannofossils. Based on the results, an Eocene-aged organic matter (OM)-rich interval was identified and traced across different parts of the North Dezful zone and partly Abadan Plain. In order to characterize the OM quality and richness of the studied intervals, Rock-Eval pyrolysis and nannofossils evaluation were performed, and the geochemical data collected along selected wells were correlated to capture the variations of thickness and source potential of the OM-rich interval. Accordingly, remarkable variations were identified within the depth ranges of 2 480–2 552 m and also 2 200–2 210 m, which were attributed to the maximum increase in the rate of growth R-selected species. This increase in the productivity rate was found to be well correlated to high Rock-Eval total organic carbon (TOC) and hydrogen index (HI) values. Given that the maturity of Pabdeh Formation in the studied area was found to have reached the oil window, we expect significant hydrocarbon generation (Type II kerogen), making the play economically highly promising.



中文翻译:

基于钙质纳米化石和Rock-Eval分析的伊朗北德兹富尔始新世地层有机质丰富度评价

利用有机地球化学和钙质纳米化石的分布研究了古近系Pabdeh组的烃源潜力。根据这些结果,在北德兹富尔带和部分阿巴丹平原的不同部分确定并追踪了一个富含始新世有机质 (OM) 的区间。为了表征所研究层段的OM质量和丰富度,进行了Rock-Eval热解和纳米化石评价,并将沿选定井收集的地球化学数据进行了关联,以捕获富含OM层段的厚度和源潜力的变化。因此,在 2 480-2 552 m 和 2 200-2 210 m 的深度范围内发现了显着的变化,这归因于 R 选择物种的生长速率的最大增加。发现生产率的这种提高与高 Rock-Eval 总有机碳 (TOC) 和氢指数 (HI) 值密切相关。鉴于已发现研究区 Pabdeh 组的成熟度已达到石油窗口,我们预计会产生大量的油气(II 型干酪根),这使得该区域在经济上非常有前景。

更新日期:2021-08-19
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