摘要:
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。
Abstract:
This paper discussed the pore-throat characteristics of Lucaogou Formation, Permian, Jimusar Sag, by Miro-CT, FIB-SEM, N2-Adsorption etc. The results indicated that Lucaogou Formation was tight oil reservoir with low to extra low permeability and its pores were falling into micro-nano scales and of various types, including intergranular pores, intercrystalline pores, dissolved pores, moldic pores, micro-fractures, interlayer fractures, and so on. The reservoir physical properties and pore structures were distinctive in different parts of Lucaogou Formation. Doloarenites in upper Tiandian have micro intergranular pores and dissolved pores. Calcareous siltstones in lower Tiandian formation held nano intergranular and intercrystalline pores with size of 0.05~0.1 μm. Calcareous ampelitic mustones in Feitiandian held intercrystalline pores, interlayer and micro fractures, size of fractures being 5~6 μm approximately.
百度学术
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