摘要
摘要:通过野外露头、钻井岩心、铸体薄片、常规薄片、核磁共振、X-衍射和扫描电镜等方法，对旬邑地区长8段沉积及储层特征进行详细研究。结果表明：目的层长8段主要发育三角洲前缘亚相沉积，发育3支水下分流河道。砂岩岩性以灰绿色、灰白色细、粉-细为主的岩屑长石砂岩为主，其次为长石岩屑砂岩，储集空间主要为溶蚀孔，残余粒间孔次之；孔隙类型多为组合，以发育粒间孔—微孔为主，发育Ⅱ类、Ⅲ类孔隙结构，孔隙度平均为8.04%，渗透率0.42×10^-3 μm²属于特低孔、超低渗油藏。长8储层I/S比为15%～20%，处于晚成岩A期；压实—压溶作用使得原始孔隙度减少52.3%，而胶结作用孔隙损失36%，建设性溶蚀作用增加面孔率1.67%。
关键词: 旬邑地区/
长8段/
储层特征/
沉积特征

Abstract:Using outcrops, the sedimentary structures and paleo-biotic features obtained from the drilling core and nuclear magnetic resonance, high pressure Hg injection, scan electron microscope, casting lamella and other methods to analyze the characteristics of sedimentary facies and reservoir of Chang 8 member in study area. The investigation finds the Chang 8 member of the Xunyi area mainly developed the braided river delta frontal subfacies, and the three underwater distributary channels are almost distribute from S-N. The Chang 8 member sandstone are mainly white-gray, green-grayish lithic feldspathic sandstone and feldspar lithic sandstone, the intergranular pore and dissolved hole are main pore space of Chang 8 reservoir, the pore types are mainly composed of intergranular pores and micropores, developing the Ⅱ and Ⅲ pore structure, porosity is 8.04% in average, permeability is 0.42×10^-3μm². It belongs to ultra-low porosity and ultra-low permeability reservoir. I/S of Chang 8 reservoir is 15%~20%, which are now in stage A of late diagenesis. Due to the compaction and presolution, cementation, the decrease of the primary sandstone porosity of each diagenesis are 52.3% and 36%, because of dissolution, the rate of face porosity slightly increased is 1.67%.
Key words:Xunyi area/
Chang 8 member/
Characteristics of reservoir/
Characteristics of sedimentary



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