扎哈泉地区上干柴沟组砂岩储层致密化原因探讨

On Jah Springs Area Ganchaigou Sandstone Reservoir Causes of Densification

扎哈泉上干柴沟组是柴达木盆地致密油勘探潜力区域。上干柴沟组的下段（N_1~1）是典型致密储层,上段（N_1~2）是甜点储层特征。研究表明：构造运动中周围地块的挤压作用对致密储层的形成具有一定控制作用;双物源、近物源及物源变化的沉积作用,致使岩石矿物组份类型多样,岩屑含量高、组份复杂,岩石结构成熟度与成份成熟度低、颗粒沉积分异差,对储层致密化起决定性作用;机械压实、压实-胶结等破坏性成岩作用是储层致密化的主要外部因素,溶蚀作用改善了储层,并应用孔隙度演化模型对各成岩作用孔隙度变化进行了模拟,结果符合地质认识。

Jah spring on Ganchaigou Qaidam Basin tight oil exploration potential of the area. Under paragraph（ N_1~1） on Ganchaigou is typical tight reservoir,the upper section（N_1~2） is a dessert reservoir characteristics. Studies have shown that： tectonic movement of compression around the block to form a dense reservoir has a certain control action; deposition double provenance,near source and provenance change,resulting in rock and mineral component types,cuttings content high component complexity,low rock structure and composition maturity maturity,grain sedimentary differentiation poor reservoir densification play a decisive role; mechanical compaction,compaction-cementation and other destructive diagenesis reservoir densified the main external factors,improved dissolution reservoir porosity evolution model and apply for various diagenesis porosity changes were simulated,the results in line with the geological understanding.