天然气地球科学

• 天然气地质学 • 上一篇    下一篇

膏岩层在油气成藏中的作用及勘探意义——以塔西南麦盖提斜坡区奥陶系为例

刘军,崔海峰,陈永权,田雷,张年春   

  1. (1.中国石油勘探开发研究院西北分院,甘肃 兰州 730020;
    2.中国石油塔里木油田勘探开发研究院,新疆 库尔勒 841000)
  • 收稿日期:2015-05-27 修回日期:2015-09-20 出版日期:2015-09-20 发布日期:2015-09-20
  • 作者简介:刘军(1983-),男,陕西渭南人,工程师,硕士,主要从事储层综合评价与油气成藏研究. E-mail:ljun2010@petrochina.com.cn.
  • 基金资助:

    中国石油天然气股份有限公司科学研究与技术开发项目(编号:090106-4)资助.

Effect of Gypsum Rock on Oil-gas Accumulating Process and Its Implication for Exploration: A Case of the Ordovician Maigaiti Slope,Southwest of Tarim Basin

LIU Jun,CUI Hai-feng,CHEN Yong-quan,TIAN Lei,ZHANG Nian-chun   

  1. (1.Research Institute of Petroleum Exploration and Development-Northwest,PetroChina,Lanzhou 730020,China;
    2.Research Institute of Exploration and Development,Tarim Oilfield Company,PetroChina,Korla 841000,China)
  • Received:2015-05-27 Revised:2015-09-20 Online:2015-09-20 Published:2015-09-20

摘要:

塔里木盆地西南部坳陷麦盖提斜坡区中—下寒武统发育区域性的膏岩盐层,其在油气成藏过程中的作用一直没有被引起足够重视。对该区油气成藏过程和主控因素认识不清等问题,使勘探目标一直局限于奥陶系风化壳附近,严重制约了勘探进展。通过油、气、水地球化学参数对其成因分析,认为中—下寒武统膏岩层对该区油、气、水成因有重要影响,和田河气田高干燥系数、高碳同位素值特征的天然气为原油裂解气在膏岩顶面以下发生热硫酸盐还原反应以后形成,以水溶气的方式充注至上覆奥陶系圈闭形成了异常的Na2SO4型地层水。结合膏岩顶面构造演化、断裂活动期次及其与油气成藏的耦合关系分析,进一步明确膏岩层对该区油气成藏也具有重要控制作用,斜坡区已发现的几个油田、气田是寒武系盐下古油气藏在膏岩层封闭作用下受构造差异调整、断裂分期疏导作用的结果。最后综合生、储、盖等因素建立油气成藏模式,预测斜坡区中—下寒武统膏岩顶面以下可以作为一个新的勘探领域。

关键词: 膏岩层, 勘探意义, 油气成藏, 奥陶系, 麦盖提斜坡, 塔西南

Abstract:

Regional gypsum rock is developed in the Lower-Middle Cambrian of Maigaiti slope,southwest depression of Tarim Basin.Its controlling effect on the accumulation of oil and gas has been seldom concerned yet.Process of the oil-gas accumulation and main controlling factors haven′t been recognized clearly,which make exploratory target be restricted near the crust of Ordovician,and progress of the oil-gas exploration has been restrained seriously.According to the genetic analysis of the oil,gas and water with geochemical parameters,it′s considered that gypsum rock of the Lower-Middle Cambrian played an important role in the genesis of oil,gas and water.Natural gas with high dryness and carbon isotopes is oil-cracked origin which has undergone thermochemical sulfate reduction reaction under the gypsum rock,and the abnormal Na2SO4 water is formed due to the mixing of the formation water with natural gases which have migrated to the Upper Ordovician traps.Based on the analysis of the structure evolution of the top layer of the gypsum,the fault active stages and the coupling with oil-gas accumulation,it′s concluded that the gypsum also played an important role in the accumulation of the oil and gas.The discovered oil-gas fields are formed by the paleo oil-gas pools of Cambrian,which were sealed up by the gypsum rock,differentially adjusted by the structure and separately transported by the fault.Finally the oil-gas accumulation model has been built by combining the factors of source rock,reservoir and cap rock etc.It′s predicted that the area under the Lower-Middle Cambrian gypsum rock of Maigaiti slope could be a new domain for exploration.

Key words: Implication for exploration, Gypsum rock, Oil-gas accumulation, Ordovician, Maigaiti slope, Southwest of Tarim Basin

中图分类号: 

  • TE122.3

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