Research and application of fluvial sand-shale thin interbedding prediction method
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摘要: 由于河道变迁频繁,河流相储层单砂体厚度薄、横向变化快,利用井网预测砂体分布的方法无法满足老油田中后期剩余油挖潜的需要.针对大港港东油田河流相储层发育的特点,建立三维地质模型进行储层预测方法实验,探索预测单期河道砂体空间展布的方法,实验表明:通过离散合成地震记录的方式,分别分析每套砂体地震反射对地震记录能量的贡献,发现在其中一套砂体地震反射能量的零点提取的振幅切片能够反映另一套单砂体的空间展布形态,利用此方法可达到预测单砂体的目的.零值法提取振幅切片能够有效地刻画井间砂体的横向变化特征,为厘定港东油田的油水关系,调整井网部署提供有力的依据.Abstract: The distribution of sand bodies detected by the well pattern can not meet the needs of the remaining oil tapping potential in the middle and late stages of the old oilfields,because the fluvial reservoirs frequently cause the thinning of the thickness of the single sand bodies and the quick lateral change.According to the characteristics of fluvial fancies reservoir in the Gangdong oilfield,Dagang,a three-dimensional model was established for the reservoir prediction method experiment,and the method of spatial distribution of single-stage channel sand body was explored.The results show that the contribution of seismic reflection to the seismic record energy of each set of sand bodies is analyzed by means of discrete synthetic seismic records.It is found that the amplitude slices extracted from the zero re-flection energy of one set of seismic reflection energies of sand bodies can reflect the other set of single sand bodies'spatial distribution, and the single sand body can be predicted by this method.The zero-value method can effectively depict the lateral variation characteris-tics of the cross-well sand body and provide a strong basis for determining the oil-water relationship and adjusting the well pattern de-ployment in the Gangdong oilfield.
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Key words:
- fluvial facies /
- thin interbedding /
- zero value method /
- three-dimensional model /
- reservoir prediction
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