天然气地球科学

• 天然气地质学 • 上一篇    下一篇

柴达木盆地英西地区中深层油气成藏过程分析

王琳,赵孟军,孟庆洋,王鹏,王科,袁海莉,申磊军,雷刚   

  1. 1.中国石油勘探开发研究院,北京 100083;
    2.中国石油天然气集团公司盆地构造与油气成藏重点实验室,北京 100083;
    3.中国石油青海油田公司勘探开发研究院,甘肃 敦煌 736202;
    4.青海油田涩北作业公司,青海 格尔木 816099;5.青海油田测试公司,青海 茫崖 816400
  • 收稿日期:2017-06-11 修回日期:2017-09-27 出版日期:2017-12-10 发布日期:2017-12-10
  • 作者简介:王琳(1992-),女,四川阆中人,硕士研究生,主要从事石油地质基础研究.E-mail:youshinuo526@163.com.
  • 基金资助:
    国家油气重大专项“前陆冲断带及复杂构造区油气成藏、分布规律与有利区评价”(编号:2016ZX05003-002);中国石油天然气股份有限公司科学研究与技术开发项目“柴达木盆地油气地质理论深化研究”(编号:2016E-0101);中国石油天然气股份有限公司科学研究与技术开发项目“前陆盆地源储配置与断—盖组合定量评价技术”(编号:2016B-0502)联合资助.
     

Analysis of hydrocarbon accumulation process in middle-deep reservoirs of Yingxi area,Qaidam Basin

Wang Lin,Zhao Meng-jun,Meng Qing-yang,Wang Peng,Wang Ke,Yuan Hai-li,Shen Lei-jun,Lei Gang   

  1. 1.Research Institute of Petroleum Exploration & Development,PetroChina,Beijing 100083,China;
    2.Key Laboratory of Basin Structure & Hydrocarbon Accumulation,CNPC,Beijing 100083,China;3.Research Institute of Petroleum Exploration & Development,Qinghai Oilfield,PetroChina,Dunhuang 736202,China;
    4.Sebei Operating Company,Qinghai Oilfield,Golmud 816099,China;
    5.Testing Company,Qinghai Oilfield,Mangya 816400,China
  • Received:2017-06-11 Revised:2017-09-27 Online:2017-12-10 Published:2017-12-10

摘要:

近年柴达木盆地英西地区已形成亿吨级规模储量区,主要是受广覆式灰云岩储层、优质盐岩盖层、晚期隆起背景复合控制,形成源—储一体的咸化湖相碳酸盐岩大型构造—岩性油气藏。英西地区位于柴达木盆地西部新生界主力烃源岩发育区内,中深层(下干柴沟组)具有近油源的先天优势,前人认为英西中深层油藏原油主要源自古近系烃源岩,对油源类型及优质储层的发育模式等进行了很多研究,但对于中深层油气充注期次和成藏过程并未进行深入研究。通过储层定量颗粒荧光、包裹体岩相学、显微测温等分析技术,结合埋藏史和热史,系统分析了英西地区中深层油气成藏演化过程。英西地区中深层原油主体为正常的中质油,但储层的QGF-E和TSF特征表明具有重质、极性极强的原油存在;储层中主要发育黄色和淡蓝色荧光2类烃包裹体,结合伴生盐水包裹体均一温度及埋藏史和热史分析认为,英西地区中深层主要经历了下油砂山组沉积末期(15Ma)的低成熟阶段原油充注、上油砂山组沉积末期(7Ma)至今的成熟—高成熟阶段原油充注的2期成藏过程;同时,由于受喜马拉雅晚期强烈构造运动影响,中深层油藏经历了原油充注和向上覆地层调整的过程。

关键词: 储层定量颗粒荧光, 流体包裹体, 油气成藏期次, 英西地区, 柴达木盆地

Abstract:

In recent years,the Yingxi area of the Qaidam Basin has formed a tonnage-scale reserve reservoir,which is mainly controlled by the wide-covering gray-rock reservoir,the high-quality salt rock cover,and the late uplift background,forming the large-scale tectonic-lithologic reservoirs of carbonate rocks.The Yingxi area is located in the Cenozoic main source rock development area in the western Qaidam Basin,and the middle and deep layers (Lower Ganchaigou Formation) have the inherent advantages of near to oil source.The predecessors believed that the crude oil in the deep reservoir was mainly from the Paleogene source rock,and have done a lot of research work on the oil source type and the development pattern of the high quality reservoir,but the process of oil charging has not been deeply studied.In this paper,the dynamic evolution of oil in the Yingxi area is analyzed systematically by means of reservoir quantitative grain fluorescence analysis,fluid inclusions petrography,homogenization temperature measurement and so on,combined with burial history and thermal history analysis.Yingxi middle-deep layer is characterized by rich middle density oil charging,while the result of QGF-E and TSF indicate that heavy and polarity oil exist in the reservoir.The reservoir mainly develop yellow and light blue fluorescent inclusions.Combined with the homogenization temperature of associated saline inclusions and burial and thermal history,it is concluded that the middle and deep layers of the Yingxi area mainly experienced the low-maturity oil charging in the late Lower Youshashan Formation (15Ma),and the mature-highly matured oil charging in the late Upper Youshashan Formation (7Ma).Meanwhile,due to the influence of the late stage of Himalayan tectonic movement,the middle and deep reservoirs have experienced the process of oil charging and transferring to upward layers.

Key words: Reservoir quantitative grain fluorescence, Fluid inclusion, Hydrocarbon accumulation period, Yingxi area, Qaidam Basin

中图分类号: 

  • TE122.1

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