摘要:
潍北油田位于山东省潍坊市北部,主要含油层系为古始新统孔店组,储层埋藏深。岩石类型主要为长石砂岩、岩屑砂岩、岩屑长石砂岩或长石岩屑砂岩等近源沉积岩类。成岩作用类型主要包括压实作用、胶结作用和次生溶蚀作用,其中压实作用是使储层原生孔隙度迅速变差的主要因素。油田孔店组砂岩储层可以划分为两个成岩阶段,五个成岩亚期。不同的成岩亚期发育不同的成岩作用类型。在成岩作用研究的基础上,笔者引入成岩相和成岩综合系数概念。成岩综合系数可以定量表征各种成岩作用的综合效应。利用视压实率与视胶结率作交会图,结合成岩综合系数与孔隙度,可以将孔店组储层划分为六种成岩相,其中以弱压实中胶结的DRF1型储集性为最好,中压实强胶结的DRF4型储集性最差。潍北油田孔店组储层主要属中压实中胶结的DRF3型,其次是孔二中亚段发育的强压实中胶结的DRF5型与孔一下亚段发育的弱压实中胶结的DRF1型,局部出现其它三种类型的成岩相。
Abstract:
The North Weifang oil field is situated in northern Weifang, Shandong. The oil-bearing rock series in the oil field are represented by the Palaeocene-Eocene Kongdian Formation strata. The rock types include the proximal sedimentary rocks such as feldspar sandstone, arkose, lithic sandstone, litharenite, lithic feldspar or feldspar lithic sandstone, lithic feldspathic litharenite. The diagenetic types include compaction, cementation and secondary solution. The reservoir sandstones in the Kongdian Formation went through two diagenetic stages and five diagenetic substages, and six diagenetic phases, of which the slightly compacted and moderately cemented DRF1-type reservoirs have the best reservoir quality, the moderately compacted and highly cemented DRF4-type reservoirs worst; subordinately come the moderately compacted and moderately cemented DRF3-type reservoirs in the Kongdian Formation, intensely compacted and moderately cemented DRF5-type reservoirs in the middle submember of the second member of the Kongdian Formation, and slightly compacted and moderately cemented DRF1-type reservoirs in the lower submember of the first member of the Kongdian Formation.
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