Study On Complicated Fault-block Comprehensive Interpretation Application For Intrusive Rock Development Area In Gaoyou Sag

This paper taking complicated fault-block of intrusive rock development area in Gaoyou sag as study object,aiming at the difficulties in structure interpretation of complicated fault-block,based on previous study,strengthening basic study and technology application of seismic description,further develops and perfects the theory and technologies of complicated fault-block structure interpretation.Summarized the fault characteristic of fault-block structure in Intrusive rock zone of Gaoyou sag,fault-block trap type,intrusive rocks characteristics and their relationship with surrounding rock,established reasonably geological model,guided structural interpretation,and improved the structural interpretation accuracy of complex fault blocks.Carried out reflection characteristics and mechanism of wave groups from T₂⁵?T₃¹ and T₃³ in two exploration strata E₂d?E₁f,using the methods of direct and indirect synthetic horizon calibration and various seismic horizon interpretation,well control,regional tectonic,random profile and iterative post-processing to solve the problem of weak reflection wave of group T₃¹,which makes the seismic horizon calibration,tracking,and interpretation accuracy are improved obviously.Summarized and applied rational analysis criterion for fault profile and plane combination of multi stage fault system,which makes the fault combination scheme in the study area is more reasonable.Analyzed the basic pattern of fault blocks and the intersection of faults,established the model of fault combination,according to section,plane and 3D fault identification methods,formed the technique of fault identification and interpretation for the study area.This paper focuses on the hidden fault identification and interpretation methods of exploration development,which effectively improves the discovery rate and description accuracy for hidden faults in the study area.Researched and analyzed the seismic speed and the variation rule of each belt,made clear well and seismic data of intrusive rock zones in different areas,summarized the reflection phenomena related to faults in the seismic reflection of intrusive rocks and their corresponding relations with fault,combined with seismic reflection property analysis of intrusive rock wave group,established the seismic identification technique of intrusive rock,According to the practical exploration and application,the application of fault identification in the development area of intrusive rock is obviously.Analyzed the influence factors of velocity,carried out the correction and stitching of velocity spectrum,established 3D fine velocity field and improved the time depth conversion accuracy.The study results have been popularized and applied in practice,obtaining good exploration benefit.