阿尔及利亚D区块储层特征及影响因素分析

Reservoir Characteristics and Impact Factors Analysis of Block D in Algeria

下泥盆Siegenian组砂岩储层是阿尔及利亚D区块的主要勘探目的层。研究其储层特征及控制因素对勘探潜力的评价及后期开发有着重要的指导意义。经过研究,块内砂岩类型主要为石英砂岩,岩屑石英砂岩,储层储集空间主要为各种类型的次生孔隙和少量的裂缝,原生粒间孔不发育,多为粒间溶孔、粒内溶孔及微裂隙。孔隙结构主要为中小孔微细喉,储层物性较差,为中低孔、特低渗储层类储层;储层性质主要受到沉积条件和成岩作用的控制,成岩作用中以压实作用和溶蚀作用对储层物性影响最大,其次是胶结作用和交代作用。

The lower Siegenian sand reservoir is the main target in D block of Algeria.The reservoir characteristics and control factors on the exploration potential evaluation and development has important implications.After the analysis,we find out that the lower Siegenian sandstones are quartzarenite,litharenite and lithic quartz.Secondary pores with a few microfissure are the main types of pores in the studied region,such as intergranular,intragranular dissolved pore.The pore structure is mainly in fine throat with middle-small pore.Reservoir property is poor,belonging to low-medium porosity and low-poor permeability.Reservoir quality is mainly controlled by depositional environment and diagenesis.The main impacts on reservoir property in diagenes are compaction and dissolution,cementation and replacement are secondary.