大型辫状河席状复合河道岩性圈闭识别描述方法及应用

张威; 何发岐; 闫相宾; 蔡利学

doi:10.11781/sysydz202103432

大型辫状河席状复合河道岩性圈闭识别描述方法及应用

doi: 10.11781/sysydz202103432

张威^{1, 2,},
何发岐¹,
闫相宾³,
蔡利学³

1.
中国石化华北油气分公司, 郑州 450006
2.
中国地质大学(武汉) 资源学院, 武汉 430074
3.
中国石化石油勘探开发研究院, 北京 102206

基金项目:

国家科技重大专项“鄂尔多斯盆地北缘低渗气藏成藏主控因素及分布特征” 2016ZX05048-002-01

中国石化科技攻关项目“杭锦旗上古生界天然气富集规律与目标评价” P17009-3

详细信息

作者简介:
张威(1986-), 男, 副研究员, 博士研究生, 从事油气地质勘探。E-mail: cupzhangwei@126.com

中图分类号: TE122.3
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- 被引次数: 0
出版历程
- 收稿日期: 2020-08-26
- 修回日期: 2021-03-19
- 刊出日期: 2021-05-28

Study and application of identification and description methods for lithologic traps in large braided river sheet composite channels

1.
SINOPEC North China Oil and Gas Company, Zhengzhou, Henan 450006, China
2.
College of Resources, China University of Geosciences(Wuhan), Wuhan, Hubei 430074, China
3.
SINOPEC Petroleum Exploration and Production Research Institute, Beijing 102206, China

摘要

摘要: 鄂尔多斯盆地二叠系致密砂岩气藏以近源、致密、大面积含气、沿主河道分布但非均质性强为特点，受砂体内部物性变化的控制，气水分异不明显，含气边界模糊不清。因此，这种类型气藏的圈闭识别描述并非通常意义上油气藏的单个圈闭识别描述，而必须以有效储集单砂体的空间叠置形成的复合河道砂体的展布预测为主要内容，描述砂体空间结构关系以确定最大储量控制单元“甜点区”。以盆地北部杭锦旗地区独贵加汗下二叠统下石盒子组一段（盒1）气藏为例，研究大型辫状河席状复合河道岩性圈闭的特征及识别描述方法。以层序格架为约束，地质模式为基础，井—震联合进行沉积相分析，实现辫状河河道砂岩有效储集体及其边界分布的有效预测与刻画；建立了此类圈闭评价六步法识别描述技术流程，能够实现利用相对低分辨率地震资料对辫状河席状复合河道中有效储集体进行有效预测。随着技术系列不断应用与完善，在独贵加汗盒1段岩性圈闭探明天然气储量已超千亿立方米。
- 席状复合河道 /
- 致密砂岩气 /
- 有效储集体 /
- 杭锦旗地区 /
- 鄂尔多斯盆地
Abstract: The gas reservoirs in the Permian tight sandstones in the Ordos Basin are characterized by near source, tightness, large-scale area of gas reservoir, distribution along the main channel, and strong heterogeneity. Influenced by the changes in the internal physical properties of sand bodies, the difference between gas and water is not obvious, and the gas boundary is also unclear. Therefore, the trap identification and the description of this type of gas reservoir is not like those for a single trap in the ubiquitous cases. It should be focused on the distribution of the composite channel sand bodies formed by the spatial superposition of effective single sand body, so as to determine the "sweet spots" of the maximum reserve unit. A case study was made for the first member of Xiashihezi Formation of Lower Permian in the Duguijiahan trap of Hangjinqi area, northern part of Ordos Basin. The characteristics as well as identification and description methods for lithologic traps in sheet-shaped composite channels of large-scale braided rivers were discussed. Constrained by the sequence framework and based on the geological model, a well-seismic joint analysis of sedimentary facies was employed here to realize the effective prediction and description of effective sandstone reservoirs and their boundary distributions in braided river channels. A six-step evaluation of this type of trap was introduced, which could predict the effective reservoirs in sheet-shaped composite channels of braided rivers by using relatively low-resolution seismic data. With the continuous application and improvement of the technical series, the proven natural gas reserves in lithological traps of the first member of Xiashihezi Formation in the Duguijiahan trap have exceeded 100 billion cubic meters.
- sheet-shaped composite channel /
- tight sandstone gas /
- effective reservoir /
- Hangjinqi area /
- Ordos Basin

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图 1 鄂尔多斯盆地杭锦旗地区构造位置

Figure 1. Structural location of Hangjinqi area, Ordos Basin

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图 2 鄂尔多斯盆地杭锦旗地区主要目的层层序地层综合柱状图

Figure 2. Comprehensive stratigraphic column of main targets in Hangjinqi area, Ordos Basin

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图 3 鄂尔多斯盆地杭锦旗地区盒1段沉积相及砂体分布

Figure 3. Sedimentary facies and sand body distribution of first member of Permian Xiashihezi Formation, Hangjinqi area, Ordos Basin

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图 4 鄂尔多斯盆地杭锦旗地区盒1段东西向沉积相综合剖面(a)与地震解释剖面(b)

剖面位置见图 3。

Figure 4. Sedimentary facies (a) and seismic interpretation (b) profiles from east to west of first member of Permian Xiashihezi Formation, Hangjinqi area, Ordos Basin

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图 5 鄂尔多斯盆地杭锦旗地区盒1段辫状河砂岩复合体综合统计图版

Figure 5. Comprehensive statistics of braided river sandstone complex of first member of Permian Xiashihezi Formation, Hangjinqi area, Ordos Basin

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图 6 鄂尔多斯盆地杭锦旗地区盒1段不同岩性岩石物理参数与砂岩叠置模式地震正演模型

Figure 6. Petrophysical parameters of rocks with different lithologies and seismic forward modeling of superimposed sandstones in first member of Permian Xiashihezi Formation, Hangjinqi area, Ordos Basin

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图 7 鄂尔多斯盆地杭锦旗地区盒1段不同砂岩叠置模式的井—震响应图版

Figure 7. Well-seismic response chart of different sandstone superimposition patterns in first member of Permian Xiashihezi Formation, Hangjinqi area, Ordos Basin

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图 8 鄂尔多斯盆地杭锦旗地区独贵加汗圈闭盒1段井—震联合沉积相分析

a.T₉d上波谷最大振幅属性与河道分布；b.盒1段下部振幅切片与地震沉积相；c.盒1段中部振幅切片与地震沉积相；d.盒1段上部振幅切片与地震沉积相；e.盒1段沉积相分布

Figure 8. Well-seismic sedimentary facies analysis of first member of Permian Xiashihezi Formation, Duguijiahan trap, Hangjinqi area, Ordos Basin

下载: 全尺寸图片幻灯片

图 9 鄂尔多斯盆地杭锦旗地区独贵加汗圈闭盒1段砂体分布

Figure 9. Trap distribution in first member of Permian Xiashihezi Formation, Duguijiahan trap, Hangjinqi area, Ordos Basin

下载: 全尺寸图片幻灯片

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