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综合岩心观察、薄片鉴定、测井、录井、分析化验等资料,查明了准噶尔盆地阜东斜坡区侏罗系石树沟群储层的主要特征:以较低成熟度的细粒—细中粒长石岩屑砂岩为主,岩屑砂岩为辅,方解石胶结物较发育,存在5种成岩相;不同层段、不同区块储层的物性不同,其中齐古组主要为中孔中渗型储层,头屯河组以中孔低渗型储层为主,局部发育中孔中渗型以及低孔低渗型储层。在此基础上,总结了储层主控因素:压实作用造成了储层物性明显的不可逆性降低;沉积相带是相对优质储层的主要控制因素;不同成岩相储层的物性差异较大,其中弱压实—弱胶结成岩相的储层物性最好,自生高岭石胶结成岩相的储层物性次之,含铁方解石中等—强胶结成岩相的储层物性随方解石的含量不同存在较大的变化,另外2类成岩相的储层物性最差。
Comprehensive core observation, sheet identification, well logging, well logging, analysis and other data to identify the main features of the Jurassic Shishuogou reservoir in the Fudong area of Junggar Basin: the lower maturity of fine-grained - thin Medium feldspar fossil litharge sandstone, supplemented by lithic sandstone, calcite cementation is more developed, there are five kinds of diagenetic facies; different layers, different reservoir properties of different blocks, of which Qi ancient group is mainly in the hole Permeable reservoirs and Toutunhe Formation are dominated by medium-porosity and low-permeability reservoirs, with locally developed mesoporosity and low-porosity and low-permeability reservoirs. Based on this, the main controlling factors of reservoir are summarized: the compaction results in obviously irreversible decrease of reservoir physical properties; sedimentary facies belt is the main controlling factor of relatively high-quality reservoir; and the physical properties of different diagenetic reservoirs are quite different , Of which the reservoir properties of weakly compacted-weakly colloidal facies are the best, followed by those of authigenic kaolinite cemented facies, and the physical properties of middle- strong glutenic diagenetic facies of iron-bearing calcite differ with the content of calcite Larger changes, the other two types of diagenetic reservoir properties of the worst.