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珠江口盆地番禺YZ气田群多因素影响下低幅构造的精细研究

汪生好 李黎 王要森 杨小江 刘振 夏晓燕 蒋玉婷

汪生好, 李黎, 王要森, 杨小江, 刘振, 夏晓燕, 蒋玉婷. 珠江口盆地番禺YZ气田群多因素影响下低幅构造的精细研究[J]. 地质科技通报, 2022, 41(3): 77-84. doi: 10.19509/j.cnki.dzkq.2022.0086
引用本文: 汪生好, 李黎, 王要森, 杨小江, 刘振, 夏晓燕, 蒋玉婷. 珠江口盆地番禺YZ气田群多因素影响下低幅构造的精细研究[J]. 地质科技通报, 2022, 41(3): 77-84. doi: 10.19509/j.cnki.dzkq.2022.0086
Wang Shenghao, Li Li, Wang Yaosen, Yang Xiaojiang, Liu Zhen, Xia Xiaoyan, Jiang Yuting. A fine study on low-rising structure of Panyu YZ gas field group in Pearl River Mouth Basin[J]. Bulletin of Geological Science and Technology, 2022, 41(3): 77-84. doi: 10.19509/j.cnki.dzkq.2022.0086
Citation: Wang Shenghao, Li Li, Wang Yaosen, Yang Xiaojiang, Liu Zhen, Xia Xiaoyan, Jiang Yuting. A fine study on low-rising structure of Panyu YZ gas field group in Pearl River Mouth Basin[J]. Bulletin of Geological Science and Technology, 2022, 41(3): 77-84. doi: 10.19509/j.cnki.dzkq.2022.0086

珠江口盆地番禺YZ气田群多因素影响下低幅构造的精细研究

doi: 10.19509/j.cnki.dzkq.2022.0086
基金项目: 

中海油有限综合科研“万亿大气区”项目“南海东部大中型天然气田勘探潜力与突破方向” KJZH-2021-0003-00

详细信息
    作者简介:

    汪生好(1983—),男,工程师,主要从事油藏地球物理研究工作。E-mail: wangshh7@cnooc.com.cn

  • 中图分类号: P542

A fine study on low-rising structure of Panyu YZ gas field group in Pearl River Mouth Basin

  • 摘要:

    珠江口盆地YZ气田群位于陆架边缘区域,气藏埋深大于3 000 m,构造研究面临水深变化大、表层低速泥岩厚度变化大、小范围浅层气等多种因素影响的问题,气藏顶界深度精细预测难度大,给气田开发方案实施带来风险。针对该问题提出一种处理解释一体化的研究思路: 首先,沿目的层及其上部地震反射标志层横向加密拾取地震速度谱,提高速度分析的精度;其次,利用已钻井合成地震记录标定后的速度对地震速度进行宏观校正,消除井震速度系统误差,应用校正后的速度进行时深转换,得到初始深度构造;通过相关性分析法明确井点处剩余误差的主要来源,以相关性趋势面为约束,结合井点剩余误差编辑误差网格以校正初始深度构造。最后,通过校正井点残差得到较高精度的深度构造。气田开发的实践表明,该方法预测的构造深度和开发井实钻深度的误差由原来的10~40 m降至10 m以内,成功提高了目标区构造预测精度,有效指导了该区开发井的设计和实施,降低了气田开发的风险。因此,对于类似地质条件下油气田,其构造精细研究不单是唯数据驱动的速度分析及偏移成像,认清构造影响因素并予以消除也是关键。

     

  • 图 1  研究区构造位置图

    Figure 1.  Structural location map of the study area

    图 2  研究区地震层位解释剖面图

    Figure 2.  Seismic horizon interpretation profile of the study area

    图 3  研究区海底时间域层位解释等值线图

    Figure 3.  Contour map of seabed time in the study area

    图 4  研究区海底至H3地层时间厚度图

    Figure 4.  Time thickness map from seabed to H3 formation in the study area

    图 5  已钻井VSP时深关系曲线对比图

    Figure 5.  Comparison of time-depth curves using VSP of drilled wells

    图 6  处理解释一体化成图技术流程

    Figure 6.  Technical process of structure mapping by integration of processing and interpretation

    图 7  沿测线方向地震速度谱采样点分布剖面示意图

    Figure 7.  Profile of seismic velocity spectrum sampling point distribution along inline

    图 8  速度谱不同拾取精度情况下沿层平均速度对比

    Figure 8.  Comparison of average velocity along layer using different spectrum picking

    图 9  已钻井VSP速度和沿层地震速度对比

    Figure 9.  Comparison of VSP velocity and seismic velocity along layer

    图 10  井驱宏观校正前后沿层地震平均速度对比

    Figure 10.  Comparison of average velocity alonglayer before and after well-driven macro correction

    图 11  YZ-A/B/C气田群ZJ1顶界构造剩余误差相关性分析

    Figure 11.  Correlation analysis of residual error of ZJ1 in YZ-A/B/C gas fields

    图 12  H3层时间网格与ZJ1顶界构造剩余误差网格对比

    Figure 12.  Comparison between time gridof H3 and residual error grid of ZJ1

    图 13  YZ气田群ZJ1顶界深度构造图

    Figure 13.  Structure map of ZJ1 in YZ gas field group

    图 14  ZJ1顶界开发井预测深度与实钻深度误差

    Figure 14.  Structure error between predicted depth and actual drilling depth of ZJ1

    表  1  ZJ1顶界时深转换后构造误差对比

    Table  1.   Comparison of structural errors aftertime-depth conversion of ZJ1

    井名 YZ-A-1 YZ-A-2 YZ-A-3 YZ-B-1 YZ-B-2 YZ-B-3 YZ-B-4 YZ-C-1 YZ-C-2 YZ-C-3 YZ-C-4 YZ-C-5 YZ-C-6 均方根
    单井VSP时深关系
    拟合较深误差/m
    -191.71 -216.87 -140.94 -220.45 -236.62 -219.07 -43.41 2.80 43.02 30.86 28.41 45.41 72.74 100.42
    常规地震速度宏观
    校正转深误差/m
    -47.61 -70.20 10.50 -76.52 -69.38 -54.56 -45.47 68.90 45.14 74.87 72.29 34.05 67.36 59.69
    下载: 导出CSV

    表  2  ZJ1顶界时深转换后构造及剩余误差校正后构造误差对比

    Table  2.   Structure error comparison between time-depth conversion and residual error correction of ZJ1

    井名 单井VSP时深转换后误差/m 常规地震速度校正后的误差/m 沿层密点速度校正后误差/m 剩余误差校正后误差(残差)/m
    YZ-A-1 -191.41 -47.61 -35.17 -1.06
    YZ-A-2 -216.87 -70.20 -58.88 -4.08
    YZ-A-3 -140.91 10.05 6.02 3.02
    YZ-B-1 -220.45 -76.52 -55.63 -5.63
    YZ-B-2 -236.62 -69.38 -51.66 4.00
    YZ-B-3 -219.07 -54.56 -43.23 3.30
    YZ-B-4 -43.41 -45.47 -38.46 -0.06
    YZ-C-1 2.80 68.90 57.51 9.20
    YZ-C-2 -43.02 45.14 31.30 0.20
    YZ-C-3 -30.86 74.87 64.75 5.75
    YZ-C-4 28.41 72.29 58.84 -1.16
    YZ-C-5 45.41 34.05 32.24 -9.76
    YZ-C-6 -72.74 67.36 49.08 11.08
    均方根 100.42 59.69 47.41 5.69
    下载: 导出CSV
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