哥伦比亚Llanos盆地东部油田Carbonera组C<sub>5</sub>段河道砂岩地震识别与预测

郑连弟; 杨江峰; 袁联生; 杨勤林; 冯方; 李洋; 马永强; 胡俊峰

doi:10.12090/j.issn.1006-6616.2018.24.03.040

哥伦比亚Llanos盆地东部油田Carbonera组C₅段河道砂岩地震识别与预测

doi: 10.12090/j.issn.1006-6616.2018.24.03.040

1.
中国石化石油物探技术研究院, 江苏南京 211103
2.
中国石化集团国际石油勘探开发有限公司, 北京朝阳 100029

基金项目:

中国石化国际勘探公司项目 BJWINJZ-NGEC-2012003

中国石化国际勘探公司项目 BJWINJZ-NGEC-2013002

详细信息

作者简介:
郑连弟(1982-), 女, 博士, 主要研究方向为地震地质学。E-mail:ldzheng01@163.com

中图分类号: P618.13;P631.4
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- 被引次数: 0
出版历程
- 收稿日期: 2017-10-10
- 修回日期: 2018-02-26
- 刊出日期: 2018-06-28

SEISMIC IDENTIFICATION AND PREDICTION OF C5 CHANNEL SANDSTONE IN THE CARBONERA FORMATION, LLANOS BASIN, COLOMBIA

1.
Geophysical Research Insititute, SINOPEC, Nanjing 211103, Jiangsu, China
2.
International Petroleum Exploration and Production Corporation, SINOPEC, Beijing 100029, China

摘要

摘要: 哥伦比亚Llanos盆地东部的中新世Carbonera组属于三角洲前缘相沉积。Carbonera组内部的水下分流河道砂体是良好的储层，因此对河道的精细刻画有利于指导下一步的油气勘探和开发。研究通过波动方程波场正演模拟建立了河道砂岩储层的地震识别模式，并利用地震沉积学RGB混频体地层切片以及沿层地震振幅属性对河道的形态、发育期次、以及砂体的平面分布进行了详细的研究。在此基础上，利用约束稀疏脉冲反演和地质统计学反演研究定量描述了河道砂体的孔隙度和厚度。最终对五条有利的河道砂岩岩性圈闭进行了详细的描述，研究区河道的宽度为322~830 m、砂岩最厚可达到35.05 m，这些河道砂体可为有利勘探目标区。区内钻探的W2井证实了该技术方法的有效性和储层描述结果的可靠性，为研究区下步的油气勘探开发提供新方向。
- Llanos盆地 /
- 河道砂岩 /
- 正演模拟 /
- RGB混频 /
- 储层反演
Abstract: The channels developed in the Micocene Carbonera formation in the eastern part of the Llanos basin, Columbia, are so favorable reservoir that the accurate descriptions for these channels are key issues in this area. Guided by the simulation of wave equation, the seismic identification mode for channel sand is established. The distribution of the channels is then predicted with RGB mixing frequencies data slices and sensitive attributes. Eventually, the thickness and porosity of sand body are quantitatively described, using constrained sparse impulse inversion and geostatistical inversion. In our study, five favorable lithologic traps of channel sandstone are described in detail. The width of channel is about 322~830 m, and the thickness for channel sand (with porosity larger than 18%) is 35.05 m, which make this channel sand favorable prospecting areas. The result of the drilling W2 verifies the validity of the technique and the reliability of the reservoir description, which provides a new direction for exploration and development in the next step.
- the Llanos Basin /
- channel sandstone /
- forward modeling /
- RGB mixing /
- reservoir inversion

HTML全文

图 1 Llanos盆地东部斜坡带Carbonera组地层岩性柱(据文献[9]修改)

Figure 1. Lithologic histogram of the Carbonera Group in the eastern slope zone of the Llanos Basin (modified after [9])

下载: 全尺寸图片幻灯片

图 2 地震波场正演模拟图

a—地质模型；b—正演模拟剖面和地质模型叠合图

Figure 2. Forward modeling of the seismic wave field

下载: 全尺寸图片幻灯片

图 3 过W1和W2井地震剖面图

Figure 3. Seismic sections cross well W1 and W2

下载: 全尺寸图片幻灯片

图 4 基于RGB混频数据体的地层切片图

Figure 4. Stratigraphic slices based on RGB mixing data volume

下载: 全尺寸图片幻灯片

图 5 河道平面分布预测图

(T₁沿层向上20 ms, 向下10 ms最大绝对振幅属性图)

Figure 5. The prediction map for channel plane distribution

(The maximum absolute amplitude diagram for T1 along the top 20 ms and down 10 ms)

下载: 全尺寸图片幻灯片

图 6 波阻抗和孔隙度反演图(剖面位置见图 5)

a—波阻抗反演剖面；b—孔隙度反演剖面

Figure 6. The inversion charts of impedance and porosity

下载: 全尺寸图片幻灯片

图 7 研究区C_5-c储层厚度预测图

Figure 7. Prediction of C5-c reservoir thickness in the study area

下载: 全尺寸图片幻灯片

表 1 地层参数统计表

Table 1. Parameters for layers

层位	Vp/(m/s)	Vs/(m/s)	ρ/(g/cm³)	Z/(g·cm^-3·m·s^-1)
C₂	2540	1472	2.32	5892.8
C₃	2822	2822	2.35	6631.70
C_3-a	3175	1832	2.20	6985.00
C₄	2674	1547	2.40	6417.60
C_5-a	2931	1691	2.15	6301.65
C₅泥	2650	1534	2.41	6386.50
C_5-c油	3142	1812	2.13	6692.46
C_5-c砂	2771	1602	2.13	5902.23
C₆	2988	1723	2.42	7230.96
C₇	3048	1758	2.12	6461.76
注：Vp—纵波速度；Vs—横波速度；ρ—密度；Z—波阻抗

下载: 导出CSV

表 2 河道参数统计表

Table 2. The statistics parameters of channel sand

河道编号	河道宽度/m	延伸长度/m	面积/km²	走向
①	830	2783	1.31	NE
②	556	6509	2.74	NNE
③	628	4575	2.48	NNE
④	322	2633	0.79	NNE
⑤	543	2361	1.91	NE

下载: 导出CSV

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