The Aogula Fault Zone in the Songliao Basin exhibits complex kinematic characteristics,making the study of the spatiotemporal matching relationships of various reservoir-forming controlling factors challenging,which brings challenges to the accurate characterization of reservoir morphology.To address this issue,a comprehensive a-nalysis of geological,seismic interpretation,and drilling data was conducted to understand the structural develop-ment history and fault causes.Based on the understanding of reservoir formation,the mechanisms of fault-con-trolled oil and gas accumulation were clarified.The fault-dense zone in the study area can be divided into two lev-els,and the faults are classified into three types based on their relationship with stratigraphic position.The study reveals that the Aogula Fault Zone is composed of two antithetic"S"-shaped main faults,experiencing three sta-ges:faulting,sagging,and inversion.During the faulting stage,the activity intensity and elongation percentage of the fault zone are the highest,gradually weakening during the sagging stage,accompanied by multiple reverse regu-lating faults,and strengthening again during the inversion stage.Oil-source faults serve as vertical migration path-ways connecting source rocks and traps,controlling the formation of fault-related traps and providing favorable con-ditions for oil and gas migration and accumulation.The research results can provide theoretical support for further exploration targeting and reserve enhancement.
Songliao BasinAogula Fault Zonestructural evolutionfault-controlled oil and gas
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