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通过微纳米CT、FIB双束扫描电镜等实验手段,对吉木萨尔凹陷二叠系芦草沟组致密油储层进行详细的探讨。研究发现,吉木萨尔凹陷二叠系芦草沟组储层为中孔-低渗、特低渗、低孔特低渗储层,孔隙以微纳米级为主,类型多样,主要有粒间孔(缝)、粒间溶孔、晶间孔、层间缝及微裂隙等。不同类型储集段,储层物性和孔隙结构差异较大:上甜点区砂屑云岩孔隙以粒间孔(缝)和溶孔为主,多为微米级;下甜点区灰质粉砂岩以粒间孔和晶间孔为主,孔隙多为纳米级,0.05~0.1μm;非甜点区的灰质炭质泥岩主要发育晶间孔、层间缝和微裂隙,裂隙宽约5~6μm。
The tight reservoirs of the Lucaogou Formation Permian in the Jimusar Sag are discussed in detail by means of micro-nano CT and FIB dual-beam scanning electron microscope. The study found that the reservoirs in Lucaogou Formation of Permian in the Jimsar Sag are medium-low permeability, ultra-low permeability and low-porosity ultra-low permeability reservoirs. The pores are dominated by micro / nano-scale with various types and mainly include intergranular Holes (seams), intergranular dissolved pores, intercrystalline pores, interlaminar seams and micro-cracks. Different types of reservoirs have different reservoir physical properties and pore structure: the pores of sandstone and dolomite in the upper dessert area are dominated by intergranular pores (pores) and dissolved pores, mostly in the micron scale; Intergranular pores and intergranular pores are dominant, and the pores are mostly in the order of nanometers, ranging from 0.05 to 0.1 μm. The gray carbonaceous mudstone in the non-sweet region mainly develops intergranular pores, interlamellar seams and micro-cracks with a fracture width of about 5 to 6 μm.