河流相储层构型研究新理论、新方法——海上油田河流相复合砂体构型概念、内容及表征方法

New theory and method of fluvial reservoir architecture study:Concepts,contents and characterization of offshore oilfield fluvial compound sand-body architecture

基于陆上油田密井网的河流相储层构型研究,经过数十年积累,理论基础及表征方法已比较成熟,然而,将其应用于海上油田稀疏井网条件时,依然面临较大的挑战。笔者团队经过多年探索,基于海上油田开发地质研究方法,形成了井震结合、以"复合砂体"为核心的海上河流相复合砂体构型理论与表征方法,其特点在于运用三维原型建模、地震构型相预测及地震驱动确定性建模等技术,重点表征影响海上油田开发的五、六、七级构型单元(复合河道带、单一河道带、复合点坝),针对开发阶段的小层细分对比及不连续渗流屏障刻画等方面具有明显的优势。目前,应用这套理论及方法开展精细地质建模和数值模拟依然存在挑战,需要进一步发挥地震资料作用并探索人工智能的地震解释新途径。

The architecture theory and characterization method of fluvial reservoir,which were based on dense wells data of onshore oilfields,have become relatively mature after decades of research.Nevertheless,it is challenging to apply this theory and method to offshore oilfields,where only sparse wells drilled.Through years of exploration,our research team proposes a new architecture theory and characterization method for fluvial reservoir of offshore oilfield by combining well data with seismic data and taking compound sand-body as major research target.Compared with previous study,this new approach employs technologies such as 3D prototype model reconstruction,seismic architecture facies prediction and seismic driving deterministic geological reservoir modeling to detailedly study the 5^th,6^th and 7^th architecture units of fluvial reservoir(compound channel belt,single channel belt and compound point bar),which shows obvious advantages on substrata division and correlation and discontinuous permeation barriers prediction in development phase.At present,there are still challenges applying this theory and method to fine geological modeling and numerical simulation.It s important to make full use of seismic data and develop artificial intelligence ways to improve seismic interpretation.