基于高分辨率层序地层分析的古近系储层精细预测技术

Precise Palaeogene reservoir prediction technology based on high resolution sequence stratigraphy

受埋藏深度以及复杂构造的影响,渤海湾盆地辽东湾坳陷旅大构造区东营组储层在横向和纵向上变化均较快,单一的地球物理方法存在较强的多解性。在实际工作基础上,建立了一套基于高分辨率层序地层分析的古近系储层精细预测技术。首先,通过层序地层分析和等时地层格架的建立,在宏观上识别出不同期次的沉积体,并确定各自的优势沉积中心;其次,结合地震相分析及正演模拟,总结出不同沉积微相对应的地震响应特征,分析表明,强振幅、低频、较连续反射为优质储层的典型特征;最后,根据不同相带的地震反射特征,优选能够反映富砂区反射规律的地震属性进行储层精细研究,实现储层边界由定性到半定量的刻画。研究结果表明,该方法在旅大构造区东三段储层预测中取得了较好的效果,且预测结果得到已钻井的证实,为该区后续的勘探开发工作提供了有力支撑。

Being influenced by buried depth and complex structures, the reservoirs within Dongying Group of Lyuda Structure in Bohai Bay Basin change quickly in both horizontal and vertical directions, which leads to strong uncertainty for geophysical methods. On the basis of practical work, a precise Palaeogene reservoir prediction technology based on high-resolution sequence stratigraphy analysis is proposed. Firstly, sedimentary bodies of different stages are identified and the corresponding depocenters are determined according to the isochronal stratigraphic framework. Secondly, seismic facies analysis and forward modeling are integrated to summarize the seismic responses of different sedimentary microfacies. Analysis indicates that quality reservoir presents as strong amplitude, low frequency and continuous reflection. Then, seismic attributes which can highlight the reflection of reservoirs are selected to conduct qualitative to semi-quantitative characterization of the reservoir distribution. Result shows that the method is well applied to the reservoir prediction of D3 Member in Lyuda tectonic region, which is confirmed by drilling outcomes and provides references for the subsequent exploration and development.