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    湖相致密白云岩不均一油藏特征及主控因素

    姚悦 王刚 李乐 刘永河

    姚悦, 王刚, 李乐, 刘永河, 2017. 湖相致密白云岩不均一油藏特征及主控因素. 地球科学, 42(12): 2327-2335. doi: 10.3799/dqkx.2017.145
    引用本文: 姚悦, 王刚, 李乐, 刘永河, 2017. 湖相致密白云岩不均一油藏特征及主控因素. 地球科学, 42(12): 2327-2335. doi: 10.3799/dqkx.2017.145
    Yao Yue, Wang Gang, Li Le, Liu Yonghe, 2017. The Reservoir Heterogeneity Characteristics and Affecting Factors of Tight Lacustrine Dolomite Reservoirs. Earth Science, 42(12): 2327-2335. doi: 10.3799/dqkx.2017.145
    Citation: Yao Yue, Wang Gang, Li Le, Liu Yonghe, 2017. The Reservoir Heterogeneity Characteristics and Affecting Factors of Tight Lacustrine Dolomite Reservoirs. Earth Science, 42(12): 2327-2335. doi: 10.3799/dqkx.2017.145

    湖相致密白云岩不均一油藏特征及主控因素

    doi: 10.3799/dqkx.2017.145
    基金项目: 

    “十三五”国家油气专项“近海大中型油气田形成条件及勘探技术” 2016ZX05024-006

    中国石油股份有限公司大港油田重点项目“塘沽地区沙三5特殊岩性体沉积特征及油藏综合评价” DGYT-2012-JS-566

    详细信息
      作者简介:

      姚悦(1992-), 女, 在读研究生, 主要从事油气储层预测研究

    • 中图分类号: P618.13

    The Reservoir Heterogeneity Characteristics and Affecting Factors of Tight Lacustrine Dolomite Reservoirs

    • 摘要: 渤海湾盆地塘沽地区沙三5亚段发育湖相含油泥质白云岩层系,油藏顶面埋深2 800~3 600 m,属于中深-深层的断块-岩性油藏,储层为致密裂缝白云岩.本文通过岩心观察、实验室分析、压力测试、裂缝分析等手段,重点研究了致密白云岩储层岩石相、储集性、复杂含油性和油藏不均一性特征,分析了成藏主控因素及成藏模式.研究表明:储层岩性以白云岩、泥质白云岩为主,为中-低孔、低渗-特低渗的裂缝-孔隙型储层,储集空间主要为晶间孔、溶孔、裂缝及溶缝;超压与含油性密切相关,超压断块井均中高产、含水率低于20%且呈持续降低趋势,常压断块井均低产、含水率高于55%且稳定-上升趋势;白云岩层系内厚层泥岩为优质烃源岩,提供充足油源;断层封闭性控制油气聚集,进而控制生烃型超压的分布,超压成为油气富集的重要标志;油气充注晚于断块-岩性圈闭形成时间,使油气充注有效.

       

    • 图  1  塘沽地区沙三5段顶面构造、井位分布及生产特征图

      赵耀等(2016)修改

      Fig.  1.  Top surface structure map with wells position and producting properties of Es35 in Tangguo area

      图  2  沙三5亚段泥质白云岩油藏剖面简化图

      Fig.  2.  Dolomite eservoir section of ES3-5

      图  3  岩石相类型与裂缝特征素描

      Fig.  3.  Fracture properties and lithologic types sketch

      图  4  白云岩储集空间特征

      a.豆状溶孔,白云岩,3 144.96 m;b.针状溶孔,白云岩,3 142.31 m;c.晶间孔,SEM图像,泥质白云岩,3 121.70 m(资料来自南京大学);d.方沸石充填的微裂缝,单偏光,10×5倍,泥质白云岩,3 131.05 m;e.藻纹层与针状溶孔,白云岩,3 151.12 m;f.变形藻纹层与针状溶孔,白云岩,3 152.31 m;g.藻纹层与石英长石碎屑层,单偏光,10×5倍,白云岩,3 160.39 m;h.藻纹层与泥质纹层,单偏光,10×10倍,白云岩,3 143.17 m

      Fig.  4.  Reservoir space of dolomite rock

      图  5  试采井的综合含水率变化趋势

      Fig.  5.  Water cut rate in test wells

      图  6  亲油层的油水赋存状态模式图

      Fig.  6.  Oil and water occurrence state in oil-wet reservoir

      图  7  有机质类型、成熟度(a)及烃源岩评价(b)

      Fig.  7.  Organic matter type, maturity (a), and the evaluation of the hydrocarbon source rocks (b)

      图  8  裂缝发育程度与岩性关系图

      Fig.  8.  Fracture density and lithologic types diagram

      图  9  沙三5亚段泥质白云岩油藏成藏模式图

      Fig.  9.  Oil accumulation pattern of dolomite reservoir in Es35

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