低渗透储层孔隙结构影响因素及其定量评价——以准噶尔盆地金龙2地区二叠系上乌尔禾组二段为例

doi:10.13278/j.cnki.jjuese.20170330

摘要/Abstract

摘要： 利用薄片、扫描电镜、物性及压汞等资料，对金龙2地区三叠系上乌尔禾组二段（P₃w₂）低渗（含砾）砂岩储层孔隙结构及其影响因素进行了研究。结果表明：①乌二段属于低孔低渗储层，根据压汞曲线参数特征，将其孔隙结构划分为三类。②成岩作用控制了储层孔隙结构，定量计算结果表明，乌二段视压实率平均为53.54%、视胶结率平均为47.53%、视溶蚀率平均为13.84%、视微孔隙率平均为60.67%，表现为中等压实、中-强胶结、弱溶蚀、微孔发育等特征；压实作用、胶结作用、微孔隙发育主要控制储层孔隙结构的形成。③引入成岩综合指数来定量表征各种成岩作用的综合强度，其与储层孔隙结构参数（排驱压力、分选系数）以及储层品质因子（RQI）具有较好的统计相关关系，Ⅰ类储层成岩综合指数大于8%，Ⅱ类储层成岩综合指数为2%~8%，Ⅲ类储层成岩综合指数小于2%。因此，可以利用成岩综合指数定量评价储层孔隙结构。

关键词: 孔隙结构, 成岩作用, 影响因素, 低渗透储层, 上乌尔禾组, 准噶尔盆地

Abstract: The pore microstructure characteristics and their influencing factors of the 2nd member of Permian Upper Urho Formation (P₃w₂) in Jinlong 2 area were analyzed by using thin sections, SEM, porosity, permeability, and mercury injection curve data. The results show that:1)P₃w₂ is characterized by low porosity and low permeability. Based on mercury injection curves, the pore microstructure can be divided into three categories. 2)Diagenesis controls P₃w₂ pore microstructure. Quantitative assessments show that the average apparent compaction rate, average apparent cementation rate, average apparent dissolution rate, and average apparent micropore rate are 53.54%, 47.53%, 13.84%,and 60.67% respectively. P₃w₂ is characterized by moderate compaction, moderate to strong cementation, weak dissolution and well developed micropores. Thus compaction, cementation, micropores are the main factors controlling the P₃w₂ pore microstructure. 3)The comprehensive diagenetic coefficient was chosen to quantitatively assess the multiple diagenetic strength, and revealed good statistical correlation with displacement pressure, sorting coefficient,and RQI. The comprehensive diagenetic coefficient value of the reservoir typesⅠ, Ⅱ and Ⅲ are more than 8%, 2%-8%, less than 2%,respectively. It can be concluded that the comprehensive diagenetic coefficient can be taken as the quantitative characterization parameter for evaluating reservoir pore microstructure.

Key words: pore structure, diagenesis, influence factor, low permeability reservoir, Upper Urho Formation, Junggar basin

中图分类号:

TE122

单祥, 郭华军, 郭旭光, 邹志文, 李亚哲, 王力宝. 低渗透储层孔隙结构影响因素及其定量评价——以准噶尔盆地金龙2地区二叠系上乌尔禾组二段为例[J]. 吉林大学学报(地球科学版), 2019, 49(3): 637-649.

Shan Xiang, Guo Huajun, Guo Xuguang, Zou Zhiwen, Li Yazhe, Wang Libao. Influencing Factors and Quantitative Assessment of Pore Structure in Low Permeability Reservoir: A Case Study of 2nd Member of Permian Upper Urho Formation in Jinlong 2 Area, Junggar Basin[J]. Journal of Jilin University(Earth Science Edition), 2019, 49(3): 637-649.

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