Oil-source correlation and Paleozoic source rock analysis in the Siwa Basin,Western Desert:Insights from well-logs,Rock-Eval pyrolysis,and biomarker data  

作　　者：Mohamed I.Abdel-Fattah Mohamed Reda Mohamed Fathy Diaa A.Saadawi Fahad Alshehri Mohamed S.Ahmed 

机构地区：[1]Petroleum Geosciences and Remote Sensing Program,Department of Applied Physics and Astronomy,College of Sciences,University of Sharjah,Sharjah,27272,United Arab Emirates [2]Geology Department,Faculty of Science,Suez Canal University,Ismailia,Egypt [3]Faculty of Science,Geology Department,Al-Azhar University,P.O.Box 11884,Nasr City,Cairo,Egypt [4]Abdullah Alrushaid Chair for Earth Science Remote Sensing Research,Geology and Geophysics Department,College of Science,King Saud University,Riyadh,11451,Saudi Arabia

出　　处：《Energy Geoscience》2024年第3期313-327,共15页能源地球科学（英文）

基　　金：the research project is funded by Abdullah Alrushaid Chair for Earth Science Remote Sensing Research at King Saud University,Riyadh,Saudi Arabia.。

摘　　要：Understanding the origins of potential source rocks and unraveling the intricate connections between reservoir oils and their source formations in the Siwa Basin(Western Desert,Egypt)necessitate a thorough oil-source correlation investigation.This objective is achieved through a meticulous analysis of well-log responses,Rock-Eval pyrolysis,and biomarker data.The analysis of Total Organic Carbon across 31 samples representing Paleozoic formations in the Siwa A-1X well reveals a spectrum of organic richness ranging from 0.17 wt%to 2.04 wt%,thereby highlighting diverse levels of organic content and the presence of both Type II and Type III kerogen.Examination of the fingerprint characteristics of eight samples from the well suggests that the Dhiffah Formation comprises a blend of terrestrial and marine organic matter.Notably,a significant contribution from more oxidized residual organic matter and gas-prone Type III kerogen is observed.Contrarily,the Desouky and Zeitoun formations exhibit mixed organic matter indicative of a transitional environment,and thus featuring a pronounced marine influence within a more reducing setting,which is associated with Type II kerogen.Through analysis of five oil samples from different wells—SIWA L-1X,SIWA R-3X,SIWA D-1X,PTAH 5X,and PTAH 6X,it is evident that terrestrial organic matter,augmented by considerable marine input,was deposited in an oxidizing environment,and contains Type III kerogen.Geochemical scrutiny confirms the coexistence of mixed terrestrial organic matter within varying redox environments.Noteworthy is the uniformity of identified kerogen Types II and III across all samples,known to have potential for hydrocarbon generation.The discovery presented in this paper unveils captivating prospects concerning the genesis of oil in the Jurassic Safa reservoir,suggesting potential links to Paleozoic sources or even originating from the Safa Member itself.These revelations mark a substantial advancement in understanding source rock dynamics and their intricate relationshi

关 键 词：Biomarker data Oil-source correlation Rock-Eval pyrolysis Source rocks Siwa Basin 

分 类 号：P618.13[天文地球—矿床学]