Scholarlink

<p>The Late Cretaceous–Paleocene Gurpi Formation in the Izeh Zone of the Zagros Fold–Thrust Belt (SW Iran) was studied through palynology and Rock–Eval pyrolysis, revealing a proximal basin setting and providing data on organic matter quantity, type, and maturity. Total organic carbon (TOC) (0.06–0.60 wt.%) and the hydrogen index HI (13–240 mg HC/g TOC) values indicate poor organic richness and low hydrocarbon potential in the studied samples of Gurpi Formation. Average Tmax (~ 440 °C) reflects maturity, but the production index (~ 0.28) together with low TOC and genetic potential (S1 + S2) point to poor–marginal oil generative capacity. Cross-plots of HI against OI and Tmax reveal that the majority of samples are Type III–dominated, with minor Type IIb, indicating oil- to gas-prone potential. Combined with palynofacies evidence, the organic matter is interpreted as predominantly terrestrial with minor marine contribution. Therefore, the Gurpi Formation in the Izeh area have limited source rock potential and are more likely to generate gaseous hydrocarbons.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Palynofacies and organic geochemistry analysis of the Gurpi Formation, SW Iran

  • 期刊论文

  • 发表日期：

    2026年4月25日

查看全文
  • Bijan Beiranvand,
  • Saeed Maleki

摘要

The Late Cretaceous–Paleocene Gurpi Formation in the Izeh Zone of the Zagros Fold–Thrust Belt (SW Iran) was studied through palynology and Rock–Eval pyrolysis, revealing a proximal basin setting and providing data on organic matter quantity, type, and maturity. Total organic carbon (TOC) (0.06–0.60 wt.%) and the hydrogen index HI (13–240 mg HC/g TOC) values indicate poor organic richness and low hydrocarbon potential in the studied samples of Gurpi Formation. Average Tmax (~ 440 °C) reflects maturity, but the production index (~ 0.28) together with low TOC and genetic potential (S1 + S2) point to poor–marginal oil generative capacity. Cross-plots of HI against OI and Tmax reveal that the majority of samples are Type III–dominated, with minor Type IIb, indicating oil- to gas-prone potential. Combined with palynofacies evidence, the organic matter is interpreted as predominantly terrestrial with minor marine contribution. Therefore, the Gurpi Formation in the Izeh area have limited source rock potential and are more likely to generate gaseous hydrocarbons.