Search for lithologic reservoir has become an important problem in the northwestern margin area in Junggar Basin. There is no essential progress in finding such reservoir using conventional measures. Based on the seismic data collected by wide azimuth acquisition, the authors made high accuracy-preserving data processing and layer flattening interpretation of the reference layer. Fine description of sedimentary environments of the Jurassic was made using the regional geological research results and drilling interpretation results by prerearchers. The sedimentary environments heighbouring the oil-bearing interval of sangonghe Formatino of Lower Jurassic in Well G19 area experienced the evolution from lacustrine facies-delta front facies-fluvial facies-lacustine facies. Interpretation results by seismic attributes also reflect the evolution of sedimentary environments of the target area and coinside well with the regional geologic results and logging interpretation results, thus provide good evidence for oil and gas exploration. Analysis of evolution of sedimentary environments can be made by seismic attributes and also contributions to exploration for lithologic reservoir in the oilfield can be made based on this.