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通过岩心观察、薄片鉴定和扫描电镜等技术手段,研究了准噶尔盆地阜东斜坡区三工河组碎屑岩储层的成岩作用及其对储层物性的影响,并分析了储层孔隙的演化形态。研究表明,三工河组储层成岩作用主要包括压实作用、胶结作用和溶蚀作用,压实作用和胶结作用造成岩石储层孔隙的损失分别在50%~80%和10%~30%之间,对储层物性起破坏作用,溶蚀作用形成的次生孔隙和微裂缝是重要的油气储集空间和渗流通道,起到改善储层物性的作用。综合成岩作用、古温度和自生矿物等标志特征,将研究区储层成岩阶段划分为早成岩阶段(A期、B期)和中成岩阶段(A期、B期)。在早成岩阶段,储层孔隙以原生孔隙为主,在中成岩阶段A期,次生孔隙开始发育,并在中成岩阶段B期达到最大值,然后又逐渐减少。
The diagenesis of the Sangonghe Formation clastic reservoir and its effect on reservoir physical properties were studied by core observation, thin slice identification and scanning electron microscopy. The evolution of reservoir porosity form. The results show that the diagenesis of the Sangonghe formation mainly includes compaction, cementation and dissolution. The compaction and cementation result in 50% ~ 80% and 10% ~ 30% loss of the rock pores, respectively Between the reservoir physical properties of the destructive effect of the dissolution of secondary pores and micro-cracks formed is an important oil and gas reservoir space and seepage channels play a role in improving physical properties of the reservoir. Based on the characteristics of diagenesis, palaeofluids and authigenic minerals, the diagenetic stage of the reservoir is divided into the early diagenetic stage (stage A and B) and the middle diagenetic stage (stage A and B). In the early diagenetic stage, the pores of the reservoirs are dominated by primary pores. During the middle diagenetic stage A, the secondary pores begin to develop and reach the maximum during the middle diagenetic stage B, and then gradually decrease.