东海陆架盆地西湖凹陷平北地区含煤地层岩性圈闭识别

牛华伟; 刘苗; 蒋涔; 朱立新; 陈茂根

doi:10.11781/sysydz202205755

东海陆架盆地西湖凹陷平北地区含煤地层岩性圈闭识别

doi: 10.11781/sysydz202205755

中国石化上海海洋油气分公司, 上海 200120

详细信息

作者简介:
牛华伟(1969-), 男, 教授级高级工程师, 从事海洋石油勘探研究及管理。E-mail: niuhw.shhy@sinopec.com

通讯作者:
刘苗(1983-), 男, 高级工程师, 从事石油物探研究。E-mail: liumiao.shhy@sinopec.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: 2021-12-07
- 修回日期: 2022-07-25
- 刊出日期: 2022-09-28

Identification of lithologic trap in coal-bearing stratum of Pingbei area, Xihu Sag, East China Sea Shelf Basin

Shanghai Offshore Oil & Gas Company, SINOPEC, Shanghai 200120, China

摘要

摘要: 东海陆架盆地西湖凹陷平北地区主要目的层始新统平湖组沉积受潮汐作用影响较大，薄砂体多层叠置、横向变化快，煤层发育。目的层埋深普遍超过3 500 m，储层物性相对较差。现有地震资料深层信噪比低、能量弱，砂泥阻抗特征差异小，储层预测及刻画难度大。在深层保幅宽频处理资料的基础上, 按照明确岩性圈闭发育类型、精细砂体描述、落实岩性圈闭目标的整体思路开展研究，明确了古地貌背景、砂体模式及岩性圈闭发育类型, 在这一格架约束下开展精细的砂体描述工作，应用地震波形、地震反射结构特征、叠前反演弹性属性相结合预测砂体，并利用叠后统计学反演预测煤层分布，提高了砂体描述的精度和可靠性。
- 保幅宽频处理 /
- 地震反射结构 /
- 叠前同时反演 /
- 地质统计学反演 /
- 西湖凹陷 /
- 东海陆架盆地
Abstract: In the Pingbei area of Xihu Sag, East China Sea Shelf Basin, the sedimentation of the main target Eocene Pinghu Formation, is significantly affected by tidal action. Thin sand bodies are stacked on top of each other, the lateral changes are fast, and coal seams are developed. The target layer has a depth of bury generally deeper than 3 500 m, and the physical properties of reservoir are relatively poor. The existing seismic data have low signal-to-noise ratio, weak energy, small impedance difference of sand and shale in the deep, and it is difficult for the reservoir prediction and description. Based on deep amplitude-preserved and broadband processing, this paper studied the type of lithologic trap development, characterization of sand reservoir, and implementation of lithologic trap targets. The paleogeomorphic background, sand development pattern and the type of litho-logic trap are defined. Under the constraints of this framework, accurate sandstone description is carried out. The sand reservoir is predicted by comprehensive analysis of seismic waveform, seismic reflection characteristics and the elastic properties of pre-stack inversion, the coal seam distribution is predicted by post-stack statistical inversion, and the accuracy and reliability of sand description are improved.
- amplitude-preserved and broadband processing /
- seismic reflection characteristics /
- pre-stack inversion /
- geostatistical inversion /
- Xihu Sag /
- East China Sea Shelf Basin

HTML全文

图 1 新、老处理资料频谱参数、信噪比对比

Figure 1. Spectrum parameters and signal-to-noise ratio of new and old processing data

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图 2 东海陆架盆地西湖凹陷平北地区西部平下段拉平地震剖面

Figure 2. Flattened seismic profile of lower section of Pinghu Formation in western Pingbei area, Xihu Sag, East China Sea Shelf Basin

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图 3 东海陆架盆地西湖凹陷平北地区平下段控砂模式

Figure 3. Sandstone-controlled model of lower section of Pinghu Formation in Pingbei area, Xihu Sag, East China Sea Shelf Basin

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图 4 东海陆架盆地西湖凹陷平北地区过W1-W3-W2井反演、波形剖面对比

Figure 4. Inversion and waveform comparison among wells W1, W3 and W2 in Pingbei area, Xihu Sag, East China Sea Shelf Basin

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图 5 东海陆架盆地西湖凹陷平北地区平湖组各层段煤层累积厚度统计

Figure 5. Cumulative thickness of coal seams in each section of Pinghu Formation, Pingbei area, Xihu Sag, East China Sea Shelf Basin

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图 6 东海陆架盆地西湖凹陷平北地区过W1-W3-W2井煤层识别剖面

Figure 6. Coal seam identification profile crossing wells W1, W3 and W2 in Pingbei area, Xihu Sag, East China Sea Shelf Basin

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图 7 东海陆架盆地西湖凹陷平北地区过W3-W5-W2井储层预测与煤层识别剖面

Figure 7. Reservoir prediction and coal seam identification profile crossing wells W3, W5 and W2 in Pingbei area, Xihu Sag, East China Sea Shelf Basin

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图 8 东海陆架盆地西湖凹陷平北地区顺凹槽(a)、顺斜坡(b)地震反射结构特征

Figure 8. Seismic reflection structure along groove (a) and down slope (b) in Pingbei area, Xihu Sag, East China Sea Shelf Basin

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图 9 东海陆架盆地西湖凹陷平北地区沉积体反射特征追踪砂体厚度(a)及P11b砂体预测厚度(b)

Figure 9. Tracked sand body thickness by sediment reflection features (a) and predicted thickness of P11b sand body in Pingbei area, Xihu Sag, East China Sea Shelf Basin

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