惠民凹陷古近系碎屑岩储集体成因类型及特征分析

对惠民凹陷在古近系碎屑岩储集体的成因特征进行了分析研究.发现成因类型有:冲积扇、河流、近岸水下扇、扇三角洲、深水浊积扇、三角洲、三角洲前缘滑塌浊积扇以及滨浅湖滩坝.储层岩石类型有砾岩、含砾砂岩、中细砂岩及粉砂岩.不同成因类型的碎屑岩储集体成分成熟度和结构成熟度差异较大,三角洲河口坝及滨浅湖滩坝砂体成分成熟度和结构成熟度最高.不同成因类型储集体的物性特征不同,三角洲平原分支河道、(扇)三角洲前缘水下分流河道及河口坝砂体储集物性最好,其次为(扇)三角洲前缘席状砂及滨浅湖滩坝砂体,近岸水下扇和浊积扇砂体物性相对较差.

Sedimentary types and physical properties of the petroclastic rock reservoirs of the Paleogene in Huimin Sag

The different sedimentary types of petroclastic rock reservoirs are developed in the Paleogene of Huimin Sag in the different stages of basin evolution, and they are alluvial fan, river, nearshore subaqueous fan, fan delta, deep-water turbidite fan, delta, delta front slump turbidite fan, and shallow-shore lake bar. The reservoir rocks consist of conglomerate, pebbly sandstone, medium-fine sandstone and siltstone. The different sedimentary types of reservoir rocks have different componential and textural maturities, of which delta front mouth bar and bar shallow-shore lake reservoir sand-bodies have the highest componential and textural maturities. The reservoir rocks deposited in fluvial environment, (fan) delta front subaqueous distributary channel and mouth bar have the best physical properties, (fan) delta-front mat-shaped and bar shore-shallow lake sand-bodies are in the second, and nearshore subaqueous fan and turbidite fan sand-bodies have the worst physical properties.