阿尔及利亚BEL构造泥盆系油藏描述

Reservoir description of Devonian in BEL structure, Algeria

阿尔及利亚某区块BEL构造泥盆系储层属中孔特低渗裂缝致密型储层,非均质性强、相变快,储层预测难度大。通过对沉积、构造及含油气性等特征分析,认为Siegenian-Low组砂体发育,连续性好,可形成有利储层;Siegenian-Med组砂体不发育,连续性差,局部地段可形成好储层;Siegenian-Up组砂体较发育,连续性较好,可形成有利储层。运用地震-沉积相分析,结合多属性优化、储层多参数随机模拟、叠前裂缝预测和叠前地震属性含油气性检测等技术,对有利区带进行了综合预测,提出了钻探井位,取得了很好的应用效果。该技术系列已成为阿尔及利亚乃至利比亚、突尼斯等地区泥盆系储层预测及描述的核心技术。

The Devonian reservoir in BEL structure in Algeria belongs to fractured tight reservoir with medium porosity and extralow permeability and has strong heterogeneity and fast facies change, which results in more difficuhies in reservoir prediction. Based on the analysis of characteristics of sediment, structure and hydrocarbon-bearing property, it is considered that the sand body of Siegenian-Low reservoir is well developed and has better continuity, and can form favorable reservoir; the sand body of Siegenian-Med reservoir is less developed with poor continuity, and only several part can form reservoir; the sand body of Siegenian-Up reservoir is relatively developed with better continuity, and can form favorable reservoir. Based on seismic-sedimentary facies analysis, combined with techniques such as multi-attribute optimization, reservoir random simulation, pre-staek fracture prediction and pre-stack seismic attribute hydrocarbon detection, the favorable areas are comprehensively predicted, and appraisal well is proposed, in which good application results have been achieved. These techniques have been the key techniques for the reservoir prediction and description in Algeria, and even Libya and Tunisia.