Characteristics And Main Control Factors Analysis Of Ordovician Karst Reservoir In Yueman Block Of North Tarim Uplift

Based on the theoretical method of carbonate rock karst reservoir research,this paper starts from the observation of cores and flakes,and establishes the section view of single well and even well sedimentary facies in the work area and analyzes them.The sedimentary facies are mainly open terraces.And subfacies are mianly inland beach The algae beach microfacies are developed in the southern part of the embankment,and the microfacies of the sandy beach are generally developed in the north.The microfacies of the basalts are in the same way.The oolitic beach microfacies are also developed in the north.The results show that there are four types of reservoirs,namely,cave type,hole type,fracture type and fracture-hole type in Yueman block,which is the block Ordovician carbonate reservoirs are the most important types of hydrocarbon reservoirs.The distribution of core porosity of a chamber in Yueman block is 0.22-3.09%,with an average value of 1.00%.The permeability distribution range is 0.003-33 × 10-3?m2,the average is 1.160 × 10-3?m2.The correlation between porosity and permeability is not obvious.And the comprehensive utilization of logging,drilling,core,earthquake and other technology to establish a semi-quantitative response to the reservoir logo.The regional geologic background of Yueman block of marine carbonate sediments and the multi-stage tectonic activity superimposed has led to the formation of a reservoir formation by tectonic action,karstification and sedimentary environment and rock type.Comprehensive impact.Based on the comprehensive analysis of reservoir development characteristics,the tectonic rupture and karstification are the main controlling factors of reservoir formation and development.Sedimentary environment and rock type are the basic controlling factors.The reservoirs are distributed in the vertical direction,mainly distributed in the 70 m range of the top of a room group.The physical properties of the reservoirs in the transverse direction are the most developed along the strike-slip fault zone,and the distribution of the reservoirs The And predicted that the Yueman of 1,2,3 and 12 fractured zones is favorable for the reservoir.