摘要
为推动准噶尔盆地腹部地区盆1井西凹陷下凹勘探,利用重点风险探井烃源岩样品分析测试资料,对准噶尔盆地腹部地区烃源岩地球化学特征及石西地区深层石炭系油藏油源开展研究,取得了以下认识:①准噶尔盆地腹部地区二叠系风城组烃源岩为一套富含三环萜烷、伽马蜡烷、C_(28)规则甾烷、轻干酪根C同位素,在咸化还原环境下形成的烃源岩;②二叠系下乌尔禾组烃源岩为一套富含五环萜烷、C_(24)四环萜烷、Ts,在半咸水、半氧化环境形成的烃源岩;③石西地区石炭系原油为高熟轻质油,富含三环萜烷、伽马蜡烷、C_(28)、C_(29)规则甾烷,C_(24)四环萜烷含量较低,全油C同位素轻,来自风城组烃源岩;④盆1井西凹陷风城组深埋烃源岩生成原油沿断裂、不整合向石炭系风化壳运移至石炭系成藏。根据油源研究结果推测,盆1井西凹陷可能发育风城组规模烃源岩,凹陷区内具有广阔的勘探前景。
In order to promote the exploration of the Western Well Pen-1 Sag in the central area of the Junggar Basin,the geochemical characteristics of the source rocks in the central area of the basin and those of the oil sources of the Carboniferous reservoirs in the Shixi area of the Junggar Basin were determined based on the experimental results for the source rock from key risk exploration Wells.The following observations were noted:①The Permian Fengcheng Formation in the central area of the basin is rich in tricyclic terpane,gamma-cerane,C_(28) regular sterane,and kerogen with a light carbon isotope composition and deposited in a saline reductive environment;②The Permian Lower Orho Formation is rich in pentacyclic terpane,C_(24) tetracyclic terpane,and Ts and deposited in a brackish semi-reduction environment;③The Carboniferous oil in Shixi area is a high-maturity light oil that is rich in tricyclic terpanes,gamacerane,C_(28) regular sterane,and C_(29) regular sterane.It has low C_(24) tetracyclic terpane content and kerogen with a light carbon isotope composition,and originates from the source rocks of the Fengcheng Formation;④The Carboniferous crude oil originates from the deep-buried source rock of the Fengcheng Formation in the Western Well Pen-1 Sag and migrates through faults and unconformities to the Carboniferous weathering crust.The results of this study demonstrate that there are broad exploration prospects in the deeper areas of the Western Well Pen-1 Sag.
作者
蒋中发
王学勇
江梦雅
刘龙松
卞保力
JIANG Zhongfa;WANG Xueyong;JIANG Mengya;LIU Longsong;BIAN Baoli(Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay 834000,Xinjiang,China)
出处
《地球化学》
CAS
CSCD
北大核心
2023年第3期311-319,共9页
Geochimica
基金
中国石油天然气集团公司重大科技专项(2017E-0401)资助。
关键词
石西地区
石炭系
风城组
油源对比
Shixi area
Carboniferous
Fengcheng Formation
oil-source correlation
