Macro heterogeneity of Chang 72 tight reservoir and its main controlling factors in Z183 block,Heshui area
Based on the core,thin sections,and mercury intrusion data of Chang 72 reservoir in Z183 block of Heshui area,the macro heterogeneity characteristics are described from three aspects:intra-layer,inter-layer,and planar view.The results indicate that there are three types of deep-water gravity flow sediments developed in the area,namely sandy debris flow,turbidity flow,and landslide,as well as two types of inter-layers,namely muddy and calcareous inter-layers,among which the muddy inter-layers appear more frequently in sediments.The overlapping relationships of sand bodies in the area can be divided into four types,and the controlling strength is from weak to strong,in order of Class Ⅰ,Class Ⅱ,Class Ⅲ and Class Ⅳ.The reservoirs in the study area can be divided into four types,and the controlling strength of planar heterogeneity is from weak to strong.The sedimentation of sandy debris flow under the semi-deep lacustrine is conducive to the formation of relatively high-porosity and hing-permeability reservoirs,and compaction is the main controlling factor for the deterioration of reservoir properties and the strengthening of heterogeneity.
Combined waterChang 72deep water gravity flowtight sandstonemacroscopic heterogeneity
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