Geochemical Investigation of the Cretaceous Crude Oil Reservoirs and Source Rock Samples in One of the Abadan Plain Oilfields, SW Iran  

作　　者：Elham ASADI MEHMANDOSTI Mahnaz AMIRHOSEYNI Seyed Ali MOALLEMI Azizollah HABIBI 

机构地区：[1]Department of Geology,Faculty of Earth Sciences,Kharazmi University,Tehran,Iran [2]Research Institute of Petroleum Industry,Tehran,Iran [3]Faculty of Chemistry Sciences,Kharazmi University,Tehran,Iran

出　　处：《Acta Geologica Sinica(English Edition)》2022年第2期546-558,共13页地质学报（英文版）

基　　金：the Department of Earth Sciences,Kharazmi University,Iran,for laboratory support。

摘　　要：Crude oil and source rock samples from one of the main oilfields of the Abadan Plain, Zagros, Iran were analyzed geochemically. Rock-Eval pyrolysis was conducted on Kazhdumi(Upper Cretaceous) and Gadvan(Lower Cretaceous) formations, which are the probable source rocks for the oil in the region. The results indicated that the Kazhdumi Formation can be classified as a fair-to-excellent source rock, while the Gadvan Formation can be identified as having poor-to-good source rock in the basin. Based on the cross-plots of HI versus OI and S2 versus TOC, types Ⅱ and Ⅲ kerogen were identified from studied source samples in the area. Determination of the main fraction percentages of the Sarvak and Fahliyan crude oils represented that the oils from the Sarvak reservoir are paraffinic-naphthenic and aromaticintermediate, whilst that from the Fahliyan reservoir is paraffinic and paraffinic-naphthenic. Biomarker ratios of the saturated fractions of oil from both reservoirs indicate that the source rocks formed in reducing marine environments with carbonate-shale lithology. Furthermore, biomarker data helped to distinguish the degree of biodegradation in the studied oils. According to geochemical analysis, oil samples from the Fahliyan reservoir were generated at a higher thermal maturity than the Sarvak reservoir samples.

关 键 词：biomarker crude oil source rock Cretaceous reservoir ZAGROS Iran 

分 类 号：P618.13[天文地球—矿床学]