【摘要】 青化砭油田上三叠统长2辫状河砂岩储集层物性主要受沉积相及成岩作用的控制。沉积相通过控制储集岩的颗粒粒度及粘土矿物含量来控制储集物性,河道中心砂岩的物性好于河道侧翼砂岩,河道间沉积的储集物性最差。压实作用是造成砂岩原生孔隙丧失的主要原因,碳酸盐矿物和石英的次生加大胶结是降低储层物性的主要胶结作用,经溶解作用改造的辫状河河道砂体成为储集性能良好的油气储集体,是今后研究区长2油层组的主攻目标。更多还原

【Abstract】 The reservoir quality is strongly influenced by the depositional facies and diagenesis of the Chang 2 sandstones of braided river facies in Qinghuabian oil field.It is suggested that the depositional facies controls reservoir quality by the grain size and clay minerals content of the sandstones,as a result,the reservoir quality of the main sandbodies within the braided rivers is better than both sides sandbodies of the braided river,while the reservoir quality of the depositions between braided rivers is the worst.It is also indicated that diagenesis is another key factor modifying reservoir properties,and the mechanical compaction is the main factor which caused the loss of primary porosity for the sandstones,carbonate cements,secondary enlargement of quartz are the main cementation that reduced the reservoir quality of the sandstones,while the reservoir quality for the braided river sandstones was improved by dissolution.So the braided river sandstone reservoir will be the dominant aims of exploration in this area for the future.更多还原