| 板桥凹陷钱圈地区沙河街组沉积及砂体展布特征 |
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| 引用本文： | 王冰洁,何生.板桥凹陷钱圈地区沙河街组沉积及砂体展布特征[J].地质科技情报,2010,29(2). |
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| 作者姓名： | 王冰洁 何生 |
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| 作者单位： | 中国地质大学构造与油气资源教育部重点实验室,武汉,430074 |
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| 摘 要： | 板桥凹陷钱圈地区沙河街组物源主要来自北部陡坡带增幅台地区和南部北大港潜山地区,在研究区北部陡坡带形成了扇三角洲沉积,在南部缓坡带形成了辫状河三角洲沉积。利用层序地层学和地震沉积学的研究思路和方法,在波阻抗数据体的基础上采用地层切片技术,在等时层序地层格架内结合单井岩-电关系,对三角洲体系砂体的展布特征进行了分析。研究结果表明:①南部缓坡带沙三上亚段沉积时期,物源主要来自北大港潜山地区,辫状河三角洲的砂体呈进积特征,展布范围逐渐变大,反映湖盆基准面下降的特征,在沙二段沉积时期,辫状河三角洲沉积物源来自增幅台和北大港潜山2个地区;陡坡带沙二段至沙一上亚段沉积时期,扇三角洲砂体呈退积特征,砂体展布范围逐渐变小,反映湖盆基准面上升的特征;②以地震波阻抗数据体为基础的地层切片技术可以清晰地刻画三角洲沉积体系的砂体沉积相带平面展布,砂体预测结果得到了钻井资料的进一步证实。
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| 关 键 词： | 砂体展布 地震波阻抗 地震沉积学 钱圈地区 板桥凹陷 |
Distributing and Depositional Characteristics of Sand Bodies of Shahejie Formation in Qianquan Area of Banqiao Sag |
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| WANG Bing-jie,HE Sheng.Distributing and Depositional Characteristics of Sand Bodies of Shahejie Formation in Qianquan Area of Banqiao Sag[J].Geological Science and Technology Information,2010,29(2). |
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| Authors: | WANG Bing-jie HE Sheng |
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| Abstract: | Shahejie Formation in Qianquan area, Banqiao Sag has two sediment sources: a fan delta whose sediments come from the Zengfutai area in the steep slope zone, and a braided river delta whose sediments are sourced from the North Dagang buried hill area of northwest slope. This paper analyzes the distribution characteristics of sandbodies in the delta depositional system by the ideas and methods of seismic sedimentology and stratigraphic slicing techniques on the basis of seismic impedance data, in combination of lithology-electric property relation in the isochronous stratigraphic framework. The results show that: ① at the North Dagang buried hill of northwest slope, the sediments mainly come from the North Dagang buried hill area in the time of the Es_3~s Formation deposition, and the sandbodies of braided river delta show prograded characteristic, reflecting a falling performance of base-levels. While in the time of Es_2 Formation deposition, the sediment sources of braided river delta come from Zengfutai area and North Dagang buried hill area. But at the steep slope zone from the time of Es_2 Formation deposition to Es_1~s Formation deposition, the fan delta sand is of retrogradation characteristic, with the decreasing extension of sandbodies, indicating the rising of the base-levels. ②The stratigraphic slicing techniques on the basis of seismic impedance data can clearly describe the plane distribution of sand sedimentary facies in the delta depositional system. The prediction results of the sandbodies have been further proved by the drilling data. |
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| Keywords: | distribution of sand body seismic impedance seismic sedimentology Qianquan area Banqiao Sag |
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