西南石油大学学报(自然科学版)

• 地质勘探 • 上一篇    下一篇

Llanos 盆地W 油田河道砂体识别与描述

胡俊峰1 *,冯方1,杨江峰2,陈冬3   

  1. 1. 中国石化国际石油勘探开发有限公司,北京朝阳100029
    2. 中国石化石油物探技术研究院,江苏南京211103
    3. 中国石化石油勘探开发研究院,北京海淀100083
  • 出版日期:2015-12-01 发布日期:2015-12-01
  • 通讯作者: 胡俊峰,E-mail:hujunfeng1011@163.com

Identification of Channel Sand in W Oilfield of Llanos Basin

Hu Junfeng1*, Feng Fang1, Yang Jiangfeng2, Chen Dong3   

  1. 1. International Petroleum Exploration and Production Corporation,SINOPEC,Chaoyang,Beijing 100029,China
    2. Geophysical Research Institute,SINOPEC,Nanjing,Jiangsu 211103,China
    3. Exploration and Production Research Institute,SINOPEC,Haidian,Beijing 100083,China
  • Online:2015-12-01 Published:2015-12-01

摘要:

南美洲Llanos 盆地W 油田的Carbonera 组C5 段内部CC5
小层发育水下分流河道,河道砂体与现低幅度构造
匹配,形成了低幅度构造岩性油藏,但是CC5
层砂体厚度薄、横向变化大、非均质性强,其地震预测精度是该区石油勘
探开发的瓶颈问题,直接影响钻探效果。为此,提出了“五步法精细刻画河道砂体厚度”的技术思路:首先,通过地层
切片技术,刻画水下分流河道的展布趋势;其次,应用正演模拟技术建立储盖组合横向变化的地震调谐效应与地震响
应特征;第三,应用叠后高分辨率处理技术进一步改善地震资料的分辨能力;第四,利用频谱成像技术定性预测了砂体
的厚度变化趋势;最后,通过叠后约束稀疏脉冲反演技术定量描述CC5
砂体的厚度及顶面构造形态。该技术思路不仅
落实了河道砂体分布,关键解决了砂体厚度定量预测问题,通过在C 井区进行系统的应用,预测结果为探井开发井位
部署提供更详实依据,得到了新钻井W C4F 的验证,由此打破前期认识的局限,发现了新油藏。

关键词: Llanos 盆地, 低幅度构造, 岩性油藏, 调谐效应, 高分辨率, 频谱成像, 反演

Abstract:

CC5
sand deposited in the Member C5 of the Carbonera formation is the main production layer of W oilfield in
Llanos basin of Southern America. Low relief structure-lithologic reservoir came into being when the CC5
sand is located at
favorable structure. Because of the thin thickness and the rapid variation of sand thickness,precision of reservoir prediction
should be improved,otherwise,drilling effect will be affected directly.“Five-step”technical idea has been proposed to resolve
this problem. First,strata slice analysis portrays the trend of sand distribution. Second,seismic forward modeling builds the
knowledge of tuning effect and seismic response of the channel sand. Third,high resolution seismic process method is used to
improve resolution of the seismic data. Fourth,spectrum decomposition is applied to study the tuning effect of CC5
sand of this
area. At last,CSSI inversion method is adopted to characterize the target sand body and the surrounding rock quantitatively.
All the study demonstrates that CC5
sand of number 2 channel is thicker than number 1 channel at the main part of channels. The
prediction has been verified by the new well W C4F. As a result,preliminary study is updated,leading to the discovery of
new reservoir. This idea has not only presented the sand body distribution in the channel,but also solved the problem of how
to predict sand body thickness quantitatively. And the systematic application of it to C area provides a detailed reference to the
arrangement of exploration well sites.

Key words: Llanos Basin, low relief structure, lithologic reservoir, tuning effect, high resolution, spectrum decomposition,
inversion

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