摘要
以准噶尔盆地西北缘玛湖凹陷二叠系风城组泥质烃源岩为研究对象,通过封闭体系热模拟实验,以热模拟温度为成熟度标尺,对风城组烃源岩的典型生物标志化合物判识参数,如姥植比、Pr/nC_(17)、β-胡萝卜烷绝对含量、C_(20)、C_(21)和C_(23)三环萜烷分布样式以及孕甾烷与规则甾烷比值等,进行不同成熟度阶段的生物标志化合物演化特征及其适用范围的研究,以期通过与盆1井西凹陷的原油进行对比,更加准确地判识盆地西北缘风城组来源的高熟油气。结果表明,除C_(20)、C_(21)与C_(23)三环萜烷的分布样式外,姥植比、Pr/nC_(17)、β-胡萝卜烷绝对含量等参数受成熟度影响较大,不能用作高熟凝析油气的来源判识。通过在油源对比分析过程中加入成熟度因素的考量,结合新建立的风城组烃源岩正构烷烃单体碳同位素图版,对盆1井西凹陷盆5井来源有争议的高熟凝析油进行对比分析,推测其主要来源于风城组烃源岩。
A thermal simulation experiment in a closed system was conducted on the cores of argillaceous source rocks in the Permian Fengcheng formation of the Mahu sag in the northwestern margin of the Junggar basin.Taking the thermal simulation temperature as a scale,the evolution characteristics and applicable ranges of the biomarkers in different stages of maturity were analyzed in light of the parameters for identifying typical biomarkers in the Fengcheng formation source rocks,which includes Pr/Ph,Pr/nC_(17),absolute content ofβcarotane,distribution patterns of C_(20),C_(21) and C_(23) tricyclic terpenes,and ratio of pregnane to regular sterane.On this basis,it is expected to more accurately identify the highmatured oil and gas from the Fengcheng formation in the northwestern margin of the Junggar basin by comparing with the crude oil in the West Pen1 sag.The results show that,in addition to the distribution patterns of C_(20),C_(21) and C_(23) tricyclic terpenes,the typical oilsource correlation parameters of the Fengcheng formation such as Pr/Ph,Pr/nC_(17),and absolute content ofβcarotane are greatly affected by maturity and cannot be used to identify the source of highmatured condensate oil and gas.By considering the maturity in the process of oilsource correlation and combined with the newly established carbon isotope chart of normal alkane monomers for the Fengcheng formation source rocks,the controversial highmature condensate oil from Well Pen5 in the West Pen1 sag was analyzed.It is speculated that the condensate oil from Well Pen5 mainly came from the Fengcheng formation source rocks.
作者
蒋文龙
阿布力米提·依明
卞保力
王韬
任海姣
韩杨
JIANG Wenlong;Ablimit·YIMING;BIAN Baoli;WANG Tao;REN Haijiao;HAN Yang(Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay,Xinjiang 834000,China)
出处
《新疆石油地质》
CAS
CSCD
北大核心
2022年第6期684-692,共9页
Xinjiang Petroleum Geology
基金
中国石油前瞻性基础性技术攻关项目(2021DJ0206)。
关键词
准噶尔盆地
西北缘
风城组
烃源岩
生物标志化合物
热模拟
高熟原油
Junggar basin
northwestern margin
Fengcheng formation
source rock
biomarker
thermal simulation
high⁃matured crude oil
