摘要
镇北地区长8砂岩整体表现为低孔、低渗储集特征，成分成熟度较低，结构成熟度中等，砂岩内填隙物含量高，成岩作用复杂，主要发育压实作用、胶结作用、溶解作用及破裂作用等4种成岩作用类型，成岩阶段为中成岩阶段A期晚期-B期早期。经研究。压实作用是导致研究区内原生孔隙大量损失的主要原因，胶结作用中碳酸盐胶结物对储层物性的影响由于其双重性的存在表现不够明显，绿泥石包膜的发育有利于储层原生粒间孔的保存，溶解作用是研究区储层物性得以改善的重要因素。
Chang8 sandstone reservoirs in Zhenbei area are low porosity and low permeability as a whole, with low component maturity, middle structural maturity, high content filling and complex diagenesis. Four kinds of diagenesis are developed in Zhenbei Oilfield, including compaction, cementation, dissolution and fracturing. And the diagenetic stage is the late period A to early period B in middle diagenetic stage. It is considered that, through researches, compaction is a main factor for the losing of primary pores. Carbonate cementation is unconspicuous to physical property of Chang8 sandstone. Chlorite film development is benefit to the conservation of primary intergranular pores. And dissolution is an important factor that improves the physical property of the reservoirs in the study area.
关键词
镇北地区
成岩作用
储层物性
长8砂岩
Zhenbei area
Diagenesis
Reservoir properties
Chang8 sandstone
