渤中凹陷A2-1构造东营组储层物性控制因素分析

根据岩石薄片、扫描电镜、物性和测井等资料,分析了渤中凹陷A2-1构造东营组砂岩储层品质控制因素,探讨了测试段产能差异的原因.通过分析认为:渤中凹陷古近系东营组储层物性主要受压实作用、沉积条件、碳酸盐胶结、溶蚀作用和黏土转化阶段控制.在负胶结物投点图上,大部分砂岩都落在压实作用区间,显示了压实作用是减少孔隙的主要因素；沉...

Analysis on the controlling factors of reservoir property in Dongying formation of structure A2 - 1 in Bozhong Sag

On the basis of thin section analysis,electron microprobe scanning,physical properties and logging data,this paper studies on controlling factors of reservoir in Paleogene Dongying formation of structure A2-1 in Bozhong Sag and discusses the reasons for different productions between the test sections.Through the analysis concerned,sandstone reservoir properties of Dongying formation in Bozhong Sag are mainly controlled by compaction,depositional environment,carbonate cementation,dissolution and clay transformation stage.In the minus-cement point diagram,most of the points are in the lower left corner,meaning compaction is the major factor of decreasing porosity.Influence of depositional environment on reservoir properties reflected most outstandingly in respect of grain size and clay content.With decreasing of grain size and increasing of clay content,permeability is rapidly decreasing.Those are the major causes of low yield.One of the reasons of low permeability and productivity of DST2 is that reservoirs generally contain carbonate cement.Dissolution which mainly reflected in the dissolution of feldspar generally exists in two test sections,DST2 test section is semi-closed system with strong overpressure,dissolving objects can't be effectively brought out from the system and deposit in pore and throat which destroyed reservoir properties a lot.Clay transformation stage has a good corresponding relationship with permeability,and permeability becomes worse when I / S(S%) is less than 15%.