准噶尔盆地乌夏地区三叠系成岩相定量研究

Quantitative study on Triassic diagenetic facies in Wuxia area,Junggar Basin

储层的性质与埋藏后的成岩作用具有密切关系。通过成岩相研究,能有效地确定与储层性质直接相关的有利储集体。该文在储层特征和成岩作用分析的基础上,通过恢复原始孔隙度,定量计算了乌夏地区三叠系储层的视压实率、视胶结率和溶蚀率,并根据计算结果厘定了储层的压实程度、胶结程度以及溶蚀程度的分类标准,阐述了9种成岩相的特征。通过三叠系成岩相的定量评价,认为具有中等压实弱胶结强溶蚀成岩相特征的乌尔禾鼻隆和夏子街断褶带是有利储集体的发育区。

Reservoir properties are closely related to the burial diagenesis. By studying diagenetic facies, we can effectively determine the favorable reservoir which is directly related to reservoir properties. On the basis of reservoir characteristics and diagenesis analysis, by recovering the original porosity, we quantitatively calculated the visible compaction rate, visible cementation rate and dissolution rate of Triassic reservoir in Wuxia area. According to the calculation results, we made classification criteria for reservoir compaction, cementation and dissolution rate, and described the diagenetic facies characteristics of nine types. By quantitative evaluating the diagenetic facies, it is considered that the favorable reservoirs mainly distribute in the area of Wuerhe nose uplift and Xiazijie fault zone with medium compaction, weak cementation and strong dissolution.