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柴达木盆地东部石炭系古岩溶缝洞单元测井响应

彭博 张浩 杨晟颢 王帅 杨元元 施辉 胡俊杰 方欣欣

彭博, 张浩, 杨晟颢, 等, 2020. 柴达木盆地东部石炭系古岩溶缝洞单元测井响应. 地质力学学报, 26 (6): 923-931. DOI: 10.12090/j.issn.1006-6616.2020.26.06.073
引用本文: 彭博, 张浩, 杨晟颢, 等, 2020. 柴达木盆地东部石炭系古岩溶缝洞单元测井响应. 地质力学学报, 26 (6): 923-931. DOI: 10.12090/j.issn.1006-6616.2020.26.06.073
PENG Bo, ZHANG Hao, YANG Shenghao, et al., 2020. Logging characterization of Carboniferous fracturedvuggy karst reservoirs in the eastern Qaidam Basin. Journal of Geomechanics, 26 (6): 923-931. DOI: 10.12090/j.issn.1006-6616.2020.26.06.073
Citation: PENG Bo, ZHANG Hao, YANG Shenghao, et al., 2020. Logging characterization of Carboniferous fracturedvuggy karst reservoirs in the eastern Qaidam Basin. Journal of Geomechanics, 26 (6): 923-931. DOI: 10.12090/j.issn.1006-6616.2020.26.06.073

柴达木盆地东部石炭系古岩溶缝洞单元测井响应

doi: 10.12090/j.issn.1006-6616.2020.26.06.073
基金项目: 

中国地质调查局地质调查项目 DD20190107

中国地质调查局地质调查项目 DD20190094

详细信息
    作者简介:

    彭博(1986-), 男, 博士, 助理研究员, 主要从事油气基础地质调查。E-mail:bo.steven.peng@gmail.com

  • 中图分类号: P62

Logging characterization of Carboniferous fracturedvuggy karst reservoirs in the eastern Qaidam Basin

  • 摘要: 柴达木盆地石炭系多发育致密化储层,后期成岩改造尤为重要。目前在盆地东部多口钻井中发现石炭系存在孔洞、溶缝以及溶蚀残丘等不同尺度的岩溶改造迹象,且个别钻井在该段有明显气测异常。因此,岩溶缝洞特征、缝洞测井响应是该区石炭系储层的基础问题。鉴于此,以柴东钻井资料为基础,岩石学-测井地球物理方法相结合,开展古岩溶缝洞单元测井响应研究。研究表明,石炭系岩溶缝洞可划分为风化壳型岩溶和沿构造断裂有关的岩溶缝洞两种类型。岩溶多见于克鲁克1~2段、扎布萨尕秀组以及怀头他拉与上覆层界限处。缝洞横向可对比,往往自然电位负异常,自然伽马中低值(20.5~35.0 API),声波时差异常增高,中子(13.9%)、密度(2.50 g/cm3)有一定镜像特征,电阻率(215.2~1100.0 Ω·m)低于围岩(>1100.0 Ω·m)。该区成熟的风化壳型岩溶缝洞在测井上表现为五个结构单元,上覆层、渣状层、溶洞层、裂隙-溶缝层、致密层。岩溶风化壳缝洞为该区主要岩溶缝洞类型,改造强度大于裂缝型,且共生。二者改造机制各异,但改造时间近似,推测为印支期的构造响应,时间持续到早中侏罗世甚至到早白垩世结束。

     

  • 图  1  研究区地理位置及地层单元划分

    a—研究区构造位置图;b—柴达木盆地东部剖面位置图;c—研究区石炭系地层柱状图

    Figure  1.  Area location and stratigraphy

    图  2  柴达木盆地石炭系缝洞单元岩石结构特征

    a—渣状层岩石破碎,青德地1井,取心照片,C2zh2;b—溶蚀缝洞,缝洞内上覆黄色泥质充填,青德地1井,取心照片,C2zh2;c—溶洞内岩溶角砾,青德地1井,取心照片,C2zh2;d—多期构造破裂,青德地1井,取心照片,C2k4;e—早期构造破裂缝方解石充填,青德地1井,取心照片,C2k4

    Figure  2.  Petrological characteristics of Carboniferous fracture and cave units in the Qaidam Basin

    图  3  柴东石炭系风化壳型岩溶常规测井响应(青德地1井890~940 m)

    1—砂质泥岩;2—砂岩;3—灰岩;4—泥灰岩;5—泥质灰岩;6—裂隙;7—缝洞

    Figure  3.  Logging response of Carboniferous weathering crust-type karst in the eastern Qaidam Basin (the Qingdedi No.1 Well, 890~940 m)

    图  4  柴东石炭系岩溶缝洞单元成像测井响应

    a—岩溶缝洞旋回示意图;b—上覆层成像测井;c—渣状层成像测井;d—溶洞层成像测井;e—隔层成像测井

    Figure  4.  FMI of Carboniferous karst fracture and cave units in the eastern Qaidam basin

    图  5  柴东石炭系表生岩溶发育模式

    Figure  5.  Carboniferous supergene karst model in the eastern Qaidam Basin

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出版历程
  • 收稿日期:  2020-09-22
  • 修回日期:  2020-11-10
  • 刊出日期:  2020-12-28

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