Fault-fracture body identification and reservoir development model:taking Baikouquan Formation in Madong area of Mahu Sag,Junggar Basin as an example
Fault-fracture body is a new type of reservoir,a structural geological body with three-dimensional irregular pore-fracture characteristics,consisting of fractures and matrix pores associated with faults and folds.Fault-fracture body includes fault sliding surfaces,fracture zones and induced fractures,and it is not only a key element for the enrichment of tight sandy conglomerate oil and gas reservoirs,but also a key factor for drilling risk prevention and precise reservoir stimulation.The tight sandy conglomerate of Baikouquan Formation in Madong area of Mahu Sag in Junggar Basin is characterized by large burial depth,tight lithology,strong heterogeneity,high abnormal pressure and difficult fracturing stimulation,and its fault-fracture body characterization has become a technical difficulty which restricts the development of oil and gas benefits.This article takes the tight sandy conglomerate reservoir fractures of Triassic Baikouquan Formation in Madong area of Mahu Sag in Junggar Basin as the research object,based on the analysis of seismic,core,imaging logging and other data,the response characteristics of fractures and development model of fault-fracture reservoirs are finely characterized at different scales.Through analysis of drilling data and fracturing data,the fault-fracture body identification method is verified,which provides important technical support for the development of oilfield benefits in geology and engineering integration.
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