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    莺歌海盆地高温高压盖层封盖能力定量评价

    谢玉洪

    谢玉洪, 2019. 莺歌海盆地高温高压盖层封盖能力定量评价. 地球科学, 44(8): 2579-2589. doi: 10.3799/dqkx.2019.095
    引用本文: 谢玉洪, 2019. 莺歌海盆地高温高压盖层封盖能力定量评价. 地球科学, 44(8): 2579-2589. doi: 10.3799/dqkx.2019.095
    Xie Yuhong, 2019. Quantitative Evaluation of Sealing Capacity of High Temperature and Pressure Caprocks in Yinggehai Basin. Earth Science, 44(8): 2579-2589. doi: 10.3799/dqkx.2019.095
    Citation: Xie Yuhong, 2019. Quantitative Evaluation of Sealing Capacity of High Temperature and Pressure Caprocks in Yinggehai Basin. Earth Science, 44(8): 2579-2589. doi: 10.3799/dqkx.2019.095

    莺歌海盆地高温高压盖层封盖能力定量评价

    doi: 10.3799/dqkx.2019.095
    基金项目: 

    国家科技重大专项“莺琼盆地高温高压天然气富集规律与勘探开发关键技术(三期) 2016ZX05024005

    详细信息
      作者简介:

      谢玉洪(1961-), 男, 教授级高级工程师, 主要从事油气勘探研究工作

    • 中图分类号: P588

    Quantitative Evaluation of Sealing Capacity of High Temperature and Pressure Caprocks in Yinggehai Basin

    • 摘要: 莺歌海盆地是我国南海重要的新生代含油气盆地,随着浅层常压层系天然气开发程度的逐渐提高,中深层高温高压层系成为天然气勘探的主要目标,超压背景下盖层封闭的有效性受到广泛关注.近年来,不同学者针对莺歌海盆地盖层进行了大量的研究,但是对高温高压的气藏盖层的封闭机理、破坏条件及其定量评价仍存在一定的问题.通过对莺歌海盆地中深层高温高压层系盖层进行系统的分析,明确盖层的封闭机理为毛细管封闭和水力封闭.利用泥岩盖层排替压力、声波时差及孔隙度之间的关系,对莺歌海盆地区域性盖层的毛细管封闭能力进行预测.莺歌海盆地中深层盖层普遍具有较强的毛细管封闭能力.因此,超压诱发的水力破裂是油气多层位聚集的根本原因,进而提出了盖层水力破裂压力系数定量评价盖层水力破裂风险性.评价结果显示,盖层发生水力破裂与底辟构造活动具有明显的相关性,盖层水力破裂风险由底辟中心向外围逐渐减弱.位于莺歌海盆地斜坡近凹带,且紧邻乐东三大底辟的LD-B区块是油气富集的有利区域.

       

    • 图  1  莺歌海盆地构造纲要

      Fig.  1.  The stuctural map of Yinggehai Baisn

      图  2  莺歌海盆地地层综合柱状图

      Fig.  2.  The comprehensive strata log diagram of Yinggehai Baisn

      图  3  莺歌海盆地莺歌海组二段下部-黄流组一段上部泥岩盖层厚度分布

      Fig.  3.  The thickness contour map of Second Member of Yinggehai to First Member of Huangliu Formation caprocks, Yinggehai Basin

      图  4  莺歌海盆地泥岩排替压力与气柱高度关系

      Fig.  4.  Relationship between mudstone displacement pressure and gas column height in Yinggehai Basin

      图  5  莺歌海盆地泥岩排替压力预测

      a.盖层孔隙度与声波时差的关系; b.盖层排替压力与孔隙度的关系

      Fig.  5.  Prediction of displacement pressure in Yinggehai Baisn

      图  6  莺歌海盆地黄流组顶部盖层排替压力分布特征

      Fig.  6.  The displacement pressure in Huangliu Formation in Yinggehai Baisn

      图  7  不同地应力及力学性质条件下盖层的水力破裂能力

      A1C1, A2C2, A3C3分别为完整盖层在不同破裂类型下的水力破裂能力;B1C1, B2C2, B3C3分别为先存水力裂缝盖层在不同应力条件下水力破裂能力

      Fig.  7.  Hydraulic fracturing of caprock in different stress and mechanical properties

      图  8  莺歌海盆地地应力和流体压力分布

      Fig.  8.  The distribution of geostress and fluid pressure in Yinggehai Baisn

      图  9  莺歌海盆地黄流组一段盖层水力破裂压力系数

      Fig.  9.  The hydraulic fracturing pressure coefficient of Huangliu caprocks in Yinggehai Basin

      表  1  不同差应力条件下岩石的破裂方式及破裂准则

      Table  1.   The fracture mode and criterion of rocks in different differential stress

      破裂模式 破裂准则 差应力条件
      张性破裂 P=S3+T ΔS < 4T
      张性剪切破裂 P=Sn+(4T2-τ2)/4T 4T < ΔS < 6T
      剪切破裂 P=Sn+(C-τ)/μ ΔS > 6T
      注:P为破裂压力(MPa);ΔS为差应力(MPa);S3为最小主应力(MPa);T为岩石抗张强度(MPa);τ为剪应力(MPa);μ为摩擦系数;据Phillips et al.(1972)
      下载: 导出CSV

      表  2  莺歌海盆地盖层岩石力学参数分布范围

      Table  2.   Distribution range of mechanical parameters of caprocks in Yinggehai Basin

      井名 DF-B3 DF-A12
      地层 黄一段 黄一段 莺二段 莺二段
      岩性 泥质粉砂岩 泥岩 粉砂质泥岩 粉砂质泥岩
      内聚力(MPa) 21.30 16.93 14.74 17.00
      摩擦系数(μ) 0.437 0.480 0.590 0.610
      抗张强度(T)(MPa) 10.65 8.47 7.37 8.50
      范围(Tμ) 7.37 < T < 10.65 0.437 < μ < 0.610
      下载: 导出CSV
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