Formation And Evolution Of Echelon Strike-Slip Faults And Prediction Of Associated Traps In Shaletian Uplift,Bohai Bay Basin

Strike-slip faults play an important guiding role in the search for oil and gas traps.The discovery and interpretation of small and micro faults provide a new method for oil and gas exploration.However,due to the lack of quantitative characterization that can effectively determine the connectivity of strike-slip faults,part of the actual production process fails.In this paper,several Ne-trending echelon strike-slip fault zones in Shaletian Uplift are studied and their geometric and kinematic characteristics are analyzed.It is found that these fault zones are formed by late dextral strike-slip.The results show that the quantitative characterization of the connection degree of echelon strike-slip faults is only related to the ratio of maximum length(D)to length(L)of echelon faults.Based on the experiment of bohai bay basin known connected echelon strike-slip fault data for statistical analysis,it is concluded that the bohai bay basin echelon strike-slip faults connected D/L the critical value,and in the study area of the small micro fracture and associated trap to explain and forecast,and found in 3 D seismic data,the seismic response of the corresponding.In the physical simulation experiment of sand box,the ratio of maximum fault distance(D)to fault length(L)tends to be constant when the echelon strike-slip faults are critically connected,which is between 0.015-0.016 and has nothing to do with the thickness of overlying sand body.The critical value of D/L of the echelon strike-slip faults in The Bohai Bay Basin is 0.009,which can be used to explain the echelon in the NE direction of the eastern Shaletian uplift.A total of 12 hidden faults and 5.1km2 area of fault control circle have been found.