Reservoir Type Identification And Development Technology Countermeasure In Yingmai 2 Well Area

Due to the complicated genesis and strong heterogeneity,carbonate reservoirs have many types of reservoir space such as holes,holes and seams,which make it difficult to accurately identify and judge the reservoir characteristics and types,cause great difficulties to the late development.In this paper,we use the observation of core sheet to study the petrological characteristics and physical properties of carbonate reservoir in Yingmai 2 well.According to the interpretation results of seismic,well logging,drilling,logging and core observation,The ordovician carbonate reservoirs in the area are mainly concentrated in a Fangfang Formation and Yingshan Formation.The reservoir matrix porosity is poorly developed,and fractures and dissolved pores are well developed.The types of effective reservoir space mainly include dissolved pores,large caves,fault broken zone and crack three categories.Based on the combination of dynamic and static data,such as seismic data,well logging data,trial mining data,well test data and acid pressure curves,a carbonate reservoir type identification template was established in Yingmai 2 well and identified that there are three types of cave reservoirs,cave-fracture pore reservoir and fracture-pore reservoir in the study area.According to the analysis of reservoir type and production dynamic analysis,it can be concluded that there are different development and technology measures for different reservoir types in Yingmai 2 well: direct injection of caves into oil wells and fractures of foraminous wells-connected unit well group is flooding.Through these technical measures to develop,we can further improve the oil recovery in Yingmai 2well area.