高校地质学报2024，Vol.30Issue(2)：218-230,13.DOI:10.16108/j.issn1006-7493.2022095
准噶尔盆地东道海子凹陷及周缘上古生界原油成因来源
Genetic Types and Origins of Upper Paleozoic-reservoiered Oil in Dongdaohaizi Sag and Its Surrounding Areas in the Junggar Basin
摘要
Abstract
Drilling in Dongdaohaizi sag started in the 1990s,but little progress has been made in oil and gas exploartaion due to the complex structural evolution and sedimentary characteristics for a long time.Recently,oil and gas indications have been found repeatedly in the exploratory wells deployed in the Dongdaohaizi Sag,which has rekindled the hope of oil and gas exploration in this area.However,the understanding of the origin of oil and gas in this area is still poor,causing significant difficulties in selecting an exploration direction.Based on systematical analyses of stable carbon isotope composition,isoprenoid alkane,sterane terpane biomarkers,and other geochemical characteristics of crude oil and source rocks in the Carboniferous and Permian strata of Dongdaohaizi sag and its surrounding areas,the genetic types and oil sources were discussed.The results showed that the crude oil in the study area has entered the main oil generation window,which belongs to mature crude oil and can be divided into three different types.Type I oil is characterized by heavy stable carbon isotope composition,high Pr/Ph ratio,abundant C19 tricyclic terpanes,C20 tricyclic terpanes and C24 tetracyclic terpanes,and low gammacerane index.These features indicate that it was derived from humic source rocks in the Lower Carboniferous Songkarsu formation,which was deposited in a freshwater environment.Type II oil is characterized by relatively light stable carbon isotope composition,relatively low Pr/Ph ratio,abundant β-Carotene,high gammacerane index,and low abundance of C19 tricyclic terpane,C20 tricyclic terpane,and C24 tetracyclic terpane.These features indicate that it was derived from the saline lacustrine source rocks in the middle Permian Pingdiquan formation.Geochemical characteristics of Type III oil are between those of Types I and II crude oil,showing a mixed source.The above findings provided a type case of oil source correlation in a multi-source superimposed area and also pointed out the direction for future petroleum exploration in the Dongdaohaizi sag and its surrounding areas.关键词
准噶尔盆地/东道海子凹陷/油源对比/石炭系/二叠系/稳定碳同位素组成/生物标志化合物Key words
Junggar Basin/Dongdaohaizi sag/oil source correlation/Carboniferous/Permian/stable carbon isotope composition/biomarker fingerprints分类
天文与地球科学引用本文复制引用
尹晟宇,龚德瑜,苏静,胡正舟,吴卫安,王瑞菊..准噶尔盆地东道海子凹陷及周缘上古生界原油成因来源[J].高校地质学报,2024,30(2):218-230,13.基金项目
自然科学基金项目(41802177 （）
42272188) （）
中国石油前瞻性基础性战略性技术攻关项目(2021DJ0206 （）
2022DJ0507) （）
中国石油直属院所基础科学研究和战略储备技术研究基金(2020D-5008-04)联合资助 （2020D-5008-04）
