准噶尔盆地车拐地区三叠系成岩作用与孔隙演化

通过岩芯观察、薄片鉴定以及测井和录井资料分析，对准噶尔盆地西北缘车拐地区三叠系储层的物性特征、孔隙类型、成岩作用及储层物性的主控因素进行了研究，认为发育于车拐地区三叠系扇三角洲前缘相带的储层经历了机械压实作用、胶结作用、交代作用、溶蚀作用等多种成岩作用，经过成岩作用和自生矿物特点可知车拐地区三叠系主要现今处于晚成岩阶段B期。压实作用为影响储层物性特征的主要因素，随着埋深的加大压实作用的增强物性随之变差，可使孔隙度减少20%以上；沸石和碳酸盐胶结物的溶蚀可使孔隙度增加达3%，研究区总的孔隙度分布范围主要在6%~18%之间，渗透率分布范围为0.08×10-3～40.0×10-3μm2。

Diagenesis and Pore Evolution of the Triassic Reservoirs in Cheguai Area, Northwestern Margin of Junggar Basin

Based on core observation, thin section identification and well logging data analysis, Triassic reservoir physical property, pore type, diagenesis and reservoir characteristics of the main control factors at northwestern margin of Cheguai area, Junggar basin were studied. Fan delta front facies reservoir experienced mechanical compaction, cementation, dissolution metasomatism, various diagenesis, and compaction effect of reservoir characteristics of the main factors. According to diagenesis and authigenic mineral characteristics, it is late diagenetic stage B period that Diagenesis of the Triassic reservoirs in Cheguai Area.With the depth increasing and compaction enhancing, physical properties become bad, which can make the porosity reduces 20%. Zeolite and carbonate cement dissolution can make the porosity is increased up to 3%, total porosity distribution range between 6%~18%, and the permeability distribution in the range of 0.08×10-3～40.0×10-3μm2. 