Main Controlling Factors Of Trap Formation And Quantitative Evaluation Of Oil-bearing Properties In Shawan Formation

The traps of Shawan Formation in Junggar basin are characterized by wide distribution,shallow burial,distant source distance and large difference in trap oil content.In order to solve the main controlling factors of oil accumulation in oil-bearing formation of Shawan Formation and its quantitative evaluation of oil content,comprehensive analysis of 43 traps in the study area was carried out.The results show that the Shawan Formation of lithologic traps traps in the east wing,with the "three high" feature,the West Wing as "senior two" features;The typical oil and gas reservoirs are dissected,and the dominant migration path,migration distance and hydrocarbon supply are proposed as the main controlling factors for controlling the trap formation of Shawan Formation.The simulation of oil and gas migration path shows that there are a number of dominant migration paths in Shawan Formation,and the traps in oil and gas migration paths have good oil-bearing property,and the traps in the main migration distance gradually decrease;In the same operation shift path,oil-bearing trap rules obviously,close to the oil source kitchen,trap oiliness is better,higher saturation with the increase of the migration distance,oil saturation decreased gradually becomes worse;Only traps within the limits of oil and gas migration are likely to become reservoirs,while hydrocarbon source strength determines the limit distance that hydrocarbon can reach in the migration path.In order to quantify the parameters controlling factors based on the constructed lithologic trap accumulation dynamics model,put forward the lithologic trap of oil column height limit understanding control trap kinetics conditions by the thickness and permeability of mudstone caprock,oil-bearing body limit oil column height showed heterogeneity of different sand,and to break in vertical area.Based on the comprehensive analysis of the main controlling factors,a quantitative evaluation model for the fullness degree of lithologic traps is established to predict the favorable exploration direction.