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    黄河口凹陷渤中27-A构造沙一二段湖相混积岩储层特征及成因

    代黎明 牛成民 庞小军 冯冲 万琳 金小燕

    代黎明, 牛成民, 庞小军, 冯冲, 万琳, 金小燕, 2020. 黄河口凹陷渤中27-A构造沙一二段湖相混积岩储层特征及成因. 地球科学, 45(10): 3797-3807. doi: 10.3799/dqkx.2020.088
    引用本文: 代黎明, 牛成民, 庞小军, 冯冲, 万琳, 金小燕, 2020. 黄河口凹陷渤中27-A构造沙一二段湖相混积岩储层特征及成因. 地球科学, 45(10): 3797-3807. doi: 10.3799/dqkx.2020.088
    Dai Liming, Niu Chengmin, Pang Xiaojun, Feng Chong, Wan Lin, Jin Xiaoyan, 2020. Reservoir Characteristics and Forming Mechanisms of Lacustrine Mixed Sedimentary Rock of First and Second Members of Shahejie Formation in BZ27-A Structure, Huanghekou Sag. Earth Science, 45(10): 3797-3807. doi: 10.3799/dqkx.2020.088
    Citation: Dai Liming, Niu Chengmin, Pang Xiaojun, Feng Chong, Wan Lin, Jin Xiaoyan, 2020. Reservoir Characteristics and Forming Mechanisms of Lacustrine Mixed Sedimentary Rock of First and Second Members of Shahejie Formation in BZ27-A Structure, Huanghekou Sag. Earth Science, 45(10): 3797-3807. doi: 10.3799/dqkx.2020.088

    黄河口凹陷渤中27-A构造沙一二段湖相混积岩储层特征及成因

    doi: 10.3799/dqkx.2020.088
    基金项目: 

    国家科技重大专项 2016ZX05024-003

    详细信息
      作者简介:

      代黎明(1981-), 男, 高级工程师, 主要从事沉积与储层研究.ORCID:0000-0002-6033-5203.E-mail:dailm@cnooc.com.cn

    • 中图分类号: P618

    Reservoir Characteristics and Forming Mechanisms of Lacustrine Mixed Sedimentary Rock of First and Second Members of Shahejie Formation in BZ27-A Structure, Huanghekou Sag

    • 摘要: 渤海海域黄河口凹陷BZ27-A(渤中27-A)构造沙一二段发育一套湖相混积岩,目前对该储层的特征及成因研究较少.通过岩心观察、铸体薄片、压汞测试等分析,系统阐述了该区混积岩储层的岩石学、储集空间类型、物性等特征,在此基础上探讨了混积岩储层控制因素.结果表明,混积岩岩性复杂多样,由陆源碎屑、黏土矿物、碳酸盐矿物及生物碎屑以多种组合方式混杂构成,发育钙质砂岩、白云质砂岩、陆屑泥晶云岩、泥晶鲕粒云岩、生物碎屑白云岩等类型,剖面上大多呈现夹层或薄互层的特点.多数混积岩储层孔隙度、渗透率低,为致密储层,局部薄层段发育相对较好储层.混积岩储层的发育主要受古地理背景、成岩作用、流体等因素影响,成岩早期大面积碳酸盐胶结是导致储层致密的主要成因,而生屑的贡献、晚期成藏时的油气侵位作用是改善储层物性的重要作用,具有形成相对优质储层的潜力.

       

    • 图  1  黄河口凹陷构造位置

      Fig.  1.  Structural location of Huanghekou sag

      图  2  BZ27-A构造沙一二段综合柱状图

      Fig.  2.  Comprehensive column map of Es1-2 in BZ27-A structure

      图  3  BZ27-A构造沙一二段混积岩岩石类型及特征

      a.钙质粗粒岩屑长石砂岩,粒间大量方解石,较均匀胶结、交代碎屑颗粒,部分方解石重结晶,见部分颗粒完全被方解石交代,BZ27-A-1井,3 692.00 m;b.钙质含砾粗粒长石岩屑砂岩,见少量螺及介形虫等生物碎片发育.碎屑颗粒被铁方解石致密胶结、强烈交代现象普遍,部分颗粒已完全被铁方解石所交代,仅残留包壳外形,BZ27-A-2井,3 751.96 m;c.含生屑云质粉-细砂岩,BZ27-A-1井,3 752.00 m;d.含盆屑白云质粗粉砂岩,盆屑成分主要为介形虫及碎片、砂屑、粉屑和少量鲕粒,胶结物主要为显微晶白云石,BZ27-A-1井,3 772.00 m;e.白云质细砂岩,粒间填隙物主要为泥晶白云石,致密胶结、交代碎屑颗粒,BZ27-A-2井,3 872.50 m;f.泥晶砂屑云岩,岩石组构包括砂屑、生屑、陆源碎屑及泥晶,砂屑较均匀定向分布,生屑见螺屑及介形,保存较完整,泥晶白云石较均匀分布于粒屑间,BZ27-A-1井,3 765.00 m;g.含陆屑泥晶云岩,左上部分为泥晶白云岩,右下部分为泥晶白云石充填在陆源碎屑颗粒间,BZ27-A-1井,3 829.00 m;h.陆屑泥晶云岩,主要为细砂级的石英、长石等陆源碎屑及泥晶组成,泥晶白云石较均匀分布于陆屑间并交代部分颗粒,BZ27-A-1井,3 873.00 m;i.生物碎屑云岩,含少量陆源碎屑颗粒,BZ27-A-1井,3 750.00 m;j.陆屑生屑泥晶云岩,陆源碎屑主要为石英、长石、岩屑,岩屑主要见花岗岩岩块,生物碎屑主要为螺和介形虫,BZ27-A-2井,3 788.66 m;k.含陆屑粒屑泥晶白云岩,主要由泥晶白云石、陆源碎屑、方解石和生物碎屑组成,碎屑成分主要由石英、长石、变质石英岩岩屑等组成,生物碎屑主要为介形虫,BZ27-A-2井,3 788.59 m;l.含陆屑泥晶鲕粒云岩,岩石矿物成分主要为白云石,其次为方解石及石英、长石;包括鲕粒、泥晶及陆屑,鲕粒见同心鲕及表鲕,表鲕鲕核主要为石英及长石,泥晶白云石较均匀分布于鲕粒及陆屑间,BZ27-A-2井,3 787.00 m

      Fig.  3.  Rock type and characteristics of mixed sedimentary rock of Es1-2 in BZ27-A structure

      图  4  沙一二段混积岩储集空间类型

      a.原生粒间孔,BZ27-A-2井,3 875.00 m;b.粒间溶蚀孔,BZ27-A-2井,3 890.00 m;c.粒内溶蚀孔,BZ27-A-2井,3 746.91 m;d.生物碎屑体腔孔,BZ27-A-1井,3 750.00 m;e.充填残余孔隙,泥晶白云石部分充填生物体腔,BZ27-A-1井,3 752.00 m;f.陆源碎屑铸模孔,BZ27-A-2井,3 751.67 m;g.白云石晶间微孔,BZ27-A-2井,3 747.25 m;h.微裂缝,BZ27-A-2井,3 751.96 m;i.收缩缝,BZ27-A-2井,3 748.69 m

      Fig.  4.  Reservoir space types of the mixed sedimentary rock of Es1-2

      图  5  沙一二段混积岩孔隙度直方图(a)和孔渗关系图(b)

      Fig.  5.  The porosity column(a) and relationship between porosity and permeability (b) of mixed sedimentary rock of Es1-2

      图  6  沙一二段混积岩毛管压力曲线特征

      φ表示孔隙度(%); K表示渗透率(10-3 μm2)

      Fig.  6.  Capillary curve characteristics of mixed sedimentary rock of Es1-2

      图  7  沙一二段沉积期古地貌恢复图

      Fig.  7.  Restoring paleogeomorphology map of the Es1-2 sedimentary period

      图  8  沙一段包裹体特征

      a.沿切穿方解石胶结物的平直微裂隙成带状分布,呈淡黄色、淡黄-灰色的液烃、气液烃包裹体,单偏光,BZ27-A-1井,3 692 m; b.与照片a同视域,显示强浅黄色荧光

      Fig.  8.  Characteristics of fluid inclusions in Es1

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    • 收稿日期:  2020-03-06
    • 刊出日期:  2020-11-17

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