准噶尔盆地阜康凹陷二叠系深层岩性油藏成藏条件及模式  

Accumulation conditions and model of Permian deep lithologic oil reservoirs in Fukang Sag,Junggar Basin

作　　者：王秋玉 闫文琦 李辉[1] 陈洪[1] 刘超威 谢知益 李宗浩[1] 陈梦娜 WANG Qiuyu;YAN Wenqi;LI Hui;CHEN Hong;LIU Chaowei;XIE Zhiyi;LI Zonghao;CHEN Mengna(Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay 834000,China)

机构地区：[1]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000

出　　处：《断块油气田》2024年第5期753-761,共9页Fault-Block Oil & Gas Field

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目“地层不整合油气藏成藏主控因素与关键要素定量评价研究”(2021DJ0405);“准噶尔盆地二叠系全油气系统地质理论与勘探实践”(2022DJ0108)。

摘　　要：利用有机碳、岩石热解、质谱-色谱、岩石薄片、铸体薄片和扫描电镜等实验,以准噶尔盆地阜康凹陷二叠系上乌尔禾组油藏为研究对象,文中通过对油藏类型及各控藏条件开展研究,揭示了阜康凹陷上乌尔禾组成藏模式。结果表明:1)芦草沟组咸水还原环境下沉积的Ⅰ类烃源岩水生生物供给充足,有机质丰度较高,成熟度高,具备良好生油潜力,为后期油气成藏提供了丰富的物质来源。2)上乌尔禾组为扇三角洲-湖泊沉积体系,埋深大,压实作用强烈,溶蚀孔和裂缝是深层特低孔特低渗储层的主要类型及油气运移的主要通道。3)乌三段泥岩盖层给油气保存创造了良好条件,通源断裂及伴生缝网给油气运移聚集提供最便利的通道,在超压体系作用下,油气源源不断地聚集成藏。4)各个成藏条件相互配置,形成“源储一体、断裂输导、超压聚集”成藏模式,油气不断聚集,形成现今的二叠系上乌尔禾组深层大型岩性油藏。该研究成果可为阜康凹陷上乌尔禾组深层油藏及国内其他岩性油藏的勘探提供参考依据。Using experiments such as organic carbon,rock pyrolysis,mass spectrum and chromatography,rock thin sections,cast thin sections,and scanning electron microscope,and taking the Permian Upper Wuerhe Formation reservoir in Fukang Sag of Junggar Basin as the research object,this paper studies the oil reservoir types and various reservoir-controlling conditions and further reveals the accumulation model of the Upper Wuerhe Formation in Fukang Sag.The results indicate that:(1)The type I hydrocarbon source rocks deposited in the saline water reducing environment of Lucaogou Formation have sufficient supply of aquatic organisms,high organic matter abundance,high maturity and good oil generation potential,providing rich material sources for later oil and gas accumulation.(2)The Upper Wuerhe Formation is a fan-delta and lake sedimentary system with large burial depth and strong compaction.Dissolution pores and fractures are the main types of deep ultra-low porosity and ultra-low permeability reservoirs and the main channels for oil migration.(3)The mudstone cap rock of Wu 3 Member creates good conditions for oil and gas preservation,and the source faults and associated fracture networks provide the most convenient channels for oil and gas migration.Under the action of overpressure system,oil and gas continuously accumulate and form reservoirs.(4)Various accumulation conditions are mutually configured to form an accumulation model of"source-reservoir integration,fault transport and overpressure accumulation".Oil and gas continue to accumulate,forming the current deep and large lithologic oil reservoir of the Permian Upper Wuerhe Formation.The research results can provide reference basis for the exploration of deep oil reservoirs in the Upper Wuerhe Formation of Fukang Sag and other lithological oil reservoirs in China.

关 键 词：岩性油藏 控藏条件 成藏模式 上乌尔禾组 阜康凹陷 

分 类 号：TE121[石油与天然气工程—油气勘探]