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三塘湖油田牛圈湖区头屯河组储集岩主要为岩屑砂岩,平均孔隙度17.48%,平均渗透率13.18×10-3μm2;孔隙类型主要以粒间孔为主,粒间溶孔、长石溶孔和岩屑溶孔次之,碳酸盐溶孔和杂基溶孔很少。研究区经历的成岩作用主要有:压实作用、胶结作用、交代作用和溶蚀作用,目的层位处于早成岩阶段晚期到晚成岩阶段早期。沉积相、碎屑成分的不同和埋藏条件的差异导致了地区之间成岩作用的差异,胶结作用是造成储集层低渗透的主要原因,机械压实作用次之。
The reservoir of Toutunhe Formation in Niuquanhu District of Santanghu Oilfield is mainly lithic sandstone with an average porosity of 17.48% and an average permeability of 13.18 × 10-3μm2. The pore types are mainly intergranular pores, intergranular dissolved pores, Feldspar dissolved pores and cuttings followed, carbonate dissolved pores and miscellaneous dissolved little. The diagenesis experienced by the study area mainly includes compaction, cementation, metasomatism and dissolution. The target beds are in the early stage of early diagenesis to early diagenetic stage. Differences in sedimentary facies, detrital composition and burial conditions lead to diagenetic differences between regions. Cementation is the main reason for low permeability of reservoirs, followed by mechanical compaction.