复杂岩性有效储层地震预测技术——以B气田大安寨段一亚段气藏为例

Seismic prediction technology for effective reservoir in complex lithology :The 1^(st) interval of Da′anzhai Section in B Gas Field case

根据B气田取心资料、野外露头、钻录井资料以及前人研究成果发现,B气田大安寨段一亚段发育滨湖、浅湖沉积亚相,储层主要为浅湖亚相介壳滩微相,储层岩性复杂,为特低孔、低渗的孔隙型储层。如何从致密复杂的岩性中识别出有效储层是研究的重点。文中运用以沉积相为指导,测井分析为基础,"相控"+"储控"为核心,地震多参数反演为主要手段的储层综合预测技术,预测了B气田大安寨段一亚段储层的展布特征、有效储层厚度及孔隙度。由此形成了一套致密复杂岩性有效储层地震预测技术序列。该技术经钻井证实,应用效果良好,为勘探部署提供了技术支撑。

For the dense and complex lithology reservoir with very low porosity, very low permeability and strong heterogeneities, this paper, taking the 1st interval of Da＇anzhai Section in B Gas field as example, presents a seismic prediction technology for dense and complex lithology reservoir. The analysis on the coring data, outcrop, drilling ＆ logging data and the results of previous studies confirms that the lake-shore and shallow lake subfacies deposition developed in the 1st interval of Da＇anzhai Section in B Gas field, the complex hthology reservoir, which is of extra low porosity and low infdtration, is mainly distributed in shelly beach microfacies of the shallow lake subfacies. The key of this research is how to tell the effective reservoir from dense complex lithology. The comprehensive technique which adopts the sedimentary facies as a guide, logging analysis as the foundation, ＂phased＂＋ ＂storage control＂ as the core, multi-parameter inversion of seismic as the main means, is used to predict the reservoir plane distribution features, thickness and porosity of the effective reservoir of the 1st interval of Da＇ anzhai Section. Meanwhile, a seismic prediction technology of effective reservoir in dense and complex lithology is formed. Drilling data confirm that the technology has played a good role in reservoir prediction of the 1 st interval of Da＇anzhai Section, and which provides the technical support for the exploration and deployment.