层序地层学应用于古地貌分析——以塔河油田为例

王家豪; 王华; 赵忠新; 潘明年; 于哲

层序地层学应用于古地貌分析——以塔河油田为例

1.
中国地质大学资源学院, 湖北武汉 430074
2.
中国石油新星公司西北石油局, 新疆乌鲁木齐 830011

详细信息

作者简介:
王家豪(1968-), 男, 讲师, 博士研究生, 主要从事沉积学、层序地层学、油气储层方面的研究工作

中图分类号: P53
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出版历程
- 收稿日期: 2003-01-15
- 刊出日期: 2003-07-25

Sequence Stratigraphy in Paleogeomorphy Analysis: An Example from Tahe Oilfield

1.
Faculty of Earth Resources, China University of Geogsciences, Wuhan 430074, China
2.
The West Bureau of Petroleum, SINOPEC, Ulumq 830011, China

摘要

摘要: 层序界面的形成伴随着剥蚀夷平、水道下切、构造抬升等古地貌改造作用; 层序的样式、层序-体系域-准层序的平面分布及削截、超覆尖灭、前积角度、退积幅度等地震反射特征也受古地貌的直接影响.因而, 层序地层提供了可供古地貌分析的信息.通过对塔河油田石炭系层序地层研究, 应用初始海泛面、最大海泛面上超尖灭线、坡折线、褶皱形态等标志, 识别了SQ1、SQ3层序发育时期的隆起、差异压实低凸起、斜坡、缓坡、凹陷等古地貌单元, 揭示了SQ3层序发育之前的构造挤压活动, 应用Ⅱ油组的砂体平面分布验证了古地貌分析结果.综合上述分析, SQ1、SQ3层序发育时期, 斜坡带和凹陷带有助于低位体系域砂体局部聚集, 是研究区岩性圈闭发育的有利场所.
- 层序地层学 /
- 古地貌 /
- 塔河油田
Abstract: The development of sequence boundaries is usually associated with the eroding peneplaining, fluvial downcutting and tectonic uplifting processes which causes a great reforming of paleogeomorphy. By contrast, sequence patterns and the distributions of the sequences, their systems tracts and parasequences are influenced by paleogeomorphy, indicated by reflection characteristics such as truncation, lapout, progradation angle, regression scope on seismic sections. The sequence stratigraphy analysis here, therefore, provides a powerful tool to identify the paleogeomorphies. Based on the research on the sequence stratigraphy of the Carboniferous, Tahe oilfield, the marks of the onlap pinch-out lines of the first flooding surface and the maximum flooding surface, slope-break lines and folding shapes have been applied to identify the different paleogeomorphic units such as the uplifts, warps of differential compaction, moderately angled slopes, gently angled slopes and depressions during SQ1 and SQ3 sequence developments, firstly revealing an uplifting event caused by tectonic compression before SQ3 sequence. Meanwhile, the planar distribution of sand-bodies of the Ⅱ oil-unit has also been used to verify the results of paleogeomorphy. Through the synthetic analysis above, the authors have found that the sand bodies in lower systems tracts of SQ1 and SQ3 sequence are mainly distributed in the slopes and the depressions consist of the favorable sites of the lithologic trapping target.
- sequence stratigraphy /
- paleogeomorphy /
- Tahe oilfield

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图 1 不同地形的地震反射示意图

Fig. 1. Sketch maps of seismic reflection in different topographies

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图 2 层序界面识别及其体系域划分

Fig. 2. Identification of sequence boundaries and their systems tracts

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图 3 SQ1层序发育时期古地貌分析依据

Fig. 3. Analysis evidences of paleogeomorphy in period of SQ1 sequence development

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图 4 SQ1层序发育时期古地貌单元及分布

1.最大海泛面上超尖灭线; 2.低位体系城分布范围; 3.坡折线; 4.钻井; 5.地震侧线

Fig. 4. Paleogeomorphic units and their distributions in period of SQ1 sequence development

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图 5 SQ3层序发育时期古地貌单元及分布

1.褶皱轴线s2.初始海泛面反射上超尖灭线; 3.古地貌单元分界线

Fig. 5. Paleogeomorphic units and their distributions in period of SQ3 sequence development

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图 6 卡拉沙依组Ⅱ油组砂体等厚图及沉积相

1.辫状河三角洲平原相; 2.辫状河三角洲前缘相; 3.前三角洲; 4.砂岩等厚线(m); 5.剥蚀界限

Fig. 6. Sand-body isopach map and sedimentary facies in Ⅱ oil-unit, Kalashayi Formation

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图 7 SQ1层序西北斜坡区岩性圈闭预测

1.砾岩; 2.含砾中砂岩; 3.含砾细砂岩; 4.中砂岩; 5.细砂岩; 6.粉砂岩; 7.砂质泥岩; 8.泥岩; 9.灰岩; 10.基准面上升; 11.基准面下降; 12.有利岩性圈闭

Fig. 7. Forecast of lithologic trap in westnorth slope, SQ1 sequence

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