梁宇,徐立恒,黄伟,陈雷,赵明珠,黄勇
LIANG Yu,XU Liheng,HUANG Wei,CHEN Lei,ZHAO Mingzhu,HUANG Yong

• 1:中国石油大庆油田有限责任公司勘探开发研究院
• 2:中国石油大庆油田有限责任公司开发事业部

摘要(Abstract)：

针对油田开发后期，零星薄储层砂体预测精度低、薄层砂体剩余潜力动用情况差的难题，开展了叠前反演薄储层预测技术研究。发展了叠前保真地震道集提频处理技术，辩证分析了叠前地质统计学反演及叠前波形指示反演的适用条件，定量评价了反演方法的识别精度。结果表明：地震频宽提高至6～100 Hz；构建了注水开发后期储层干岩石模型，建立了可定量区分不同厚度砂岩的岩石物理图版；研究区主力砂岩储层具有低纵横波速度比、低纵波阻抗值的特征，随着砂岩厚度的增加，其纵横波速度比及纵波阻抗值逐渐变小；叠前反演对厚度为1～2 m的薄互层砂体识别精度达到81.5%以上，比叠后反演高出10百分点，提高了厚度2m左右薄储层砂体的预测精度。研究成果在大庆长垣及外围多个区块的薄层砂体精细预测中取得了很好的应用效果，为大庆长垣油田两驱精准挖潜和外围油田增储稳产提供了有力支撑。
Aiming at the challanges of low prediction accuracy of sporadic thin reservoir sand bodies and poor production of remaining potential of thin reservoir sand bodies in late stage of oilfield development, research on prestack inversion thin reservoir prediction technology is conducted, pre-stack fidelity-preserved seismic gather frequency enhancement processing technique is developed, the applicability conditions for pre-stack geostatistical inversion and pre-stack waveform indication inversion are dialectically anaylzed, and the identification accuracy of inversion methods are quantitatively evaluated. The results show seismic frequency bandwidth increases to 6-100 Hz. An innovative dry rock model for reservoirs in late stage of water injection development is constructed, establishing petrophysical chart to quantitatively distinguish sandstone with various thicknesses. The main sandstone reservoirs in studied area are characterized by low P-S wave velocity ratio and low P-wave impedance value, with both parameters decreasing gradually as the increase of sandstone thickness. Identification accuracy of pre-stack inversion for thin interbedded sand bodies with thickness of 1-2 m is up to >81.5%, which is 10 percentage points higher than that of post-stack inversion, improving the prediction accuracy of thin reservoir sand bodies with thinkness of approximately 2m. The research has excellent application effect in fine prediction of thin sand bodies in various blocks of Daqing Placanticline and peripheral oilfields, providing significant support for precise potential tapping of water-chemical flooding in Daqing Placanticline oilfield, reserve increase and oil production stablization in peripheral oilfields.

关键词(KeyWords)： 薄储层预测;叠前反演;地质统计学;波形指示;岩石物理建模;开发后期
thin reservoir prediction;pre-stack inversion;geostatistics;waveform indication;petrophysical modeling;late development stage

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气股份有限公司重大科技专项“中高渗油田特高含水期大幅度提高采收率技术研究”(2023ZZ22)

作者(Author): 梁宇,徐立恒,黄伟,陈雷,赵明珠,黄勇
LIANG Yu,XU Liheng,HUANG Wei,CHEN Lei,ZHAO Mingzhu,HUANG Yong

DOI: 10.19597/J.ISSN.1000-3754.202504049

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