陈显森
CHEN Xiansen

• 1:中国石油大庆油田有限责任公司勘探开发研究院

摘要(Abstract)：

大庆油田古龙凹陷Y54井区西部青一段厚砂岩区的地震反射超强，屏蔽了下伏泉四段扶余油层砂岩的反射能量，造成地震反射特征与实际钻遇砂岩应有的地震信息严重不符。为了恢复真实的地震反射振幅，采用地震子波分解与重构技术，消除上覆青一段厚砂岩强反射屏蔽作用，提高扶余油层砂岩储层的识别精度。结果表明：目的层地震反射相对振幅在纵向和横向上的能量分布更加均衡，分辨率得到明显提高，主频由20 Hz提高到26 Hz；基于新的地震处理数据，地震振幅属性预测的砂岩厚度与区内16口钻井实际钻遇砂岩厚度的相关性由原来的43.7%提高到81.25%，同时地震反演预测结果也得到了盲井验证。研究成果可为类似的地震反射异常地区的储层预测提供有效的解决方案。
Ultra-strong seismic reflection in thick sandstone zone of Qing-1Member in the west of Y54 well block in Gulong Sag of Daqing Oilfield shields the reflection energy of sandstone in Fuyu reservoir in underlying Quan-4Member, causing serious discrepancy between seismic reflection characteristics and seismic data required from drilled sandstone. In order to recover the real seismic amplitude, seismic wavelet decomposition and reconstruction technique is adopted to eliminate strong reflection shielding effect of overlying thick sandstone in Qing-1 Member and improve identification accuracy of Fuyu sandstone reservoir. Results show that seismic reflection relative amplitude of target layer has more uniform energy distribution in vertical and horizontal directions, with resolution significantly improved and dominant frequency increased from 20 Hz to 26 Hz. Based on newly processed data, correlation between seismic amplitude attribute predicted sandstone thickness and that obtained from 16 drilled wells in the block increases from 43.7% to 81.25%. Meanwhile, seismic inversion results are verified by blind wells. This research provides effective solution for reservoir prediction in similar seismic reflection anomaly areas.

关键词(KeyWords)： 子波分解与重构;储层预测;地震反射;屏蔽;扶余油层;古龙凹陷
wavelet decomposition and reconstruction;reservoir prediction;seismic reflection;shielding;Fuyu reservoir;Gulong Sag

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项“松辽盆地北部岩性油气藏区带评价与目标优选”（2017ZX05001-002-006）

作者(Author): 陈显森
CHEN Xiansen

DOI: 10.19597/j.issn.1000-3754.202208041

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