| Triassic Oolitic shoal reservoir of Sichuan Basin shows a good potential of large hydrocarbon reserve.However,combining with present actual condition,natural gas exploration of Feixianguan Formation in Northeast Sichuan is still low thus its prospect is very broad.Considering that the study on sedimentary facies and reservoirs in this area is not quite thorough and that carbonate reservoir behaves strong heterogeneity, hence it depends on multiple geophysics methods to make deep analysis of resevoir condition in this area.In this paper,lower Triassic Oolitic shoal reservoir of Feixianguan Formation in DKH area is taken as the main study object.Based on fully combination with existing geological,3D seismic,logging information,utilize coherence cube analysis and seismic attribute analysis techniques to predict distribution range of oolitic shoal reservoir and it proposes suitable seismic prediction process for oolitic shoal reservoir.Firstly,further explore hinterland structrues,fault exhibition and high-spot position by using3D seismic data that achieves more reliable geological structure results.Moreover,geophysical response of reservoir has been analysied through sedimentary facies features and logging information.Secondly,Applying coherence cube analysis to show and highlight lateral variation,predicting fracture development belts of this area and analysing the influence on oolitic shoal resevoir.Meanwhile,choose RMS amplitude, gradient of reflection strength and instantaneous frequency to predict oolitic shoal resevoir.And these three attributes sensitively reflect oolitic shoal resevoir.Finally,by analysing actual condition of work area, thickness of oolitic shoal resevoir and porosity are predicted depending on impedance inversion technology and porosity inversion technology.Besides.it reaches the purpose to interpret and forecast oolitic shoal resevoir through using reservoir thickness and porosity to caculate gas storage factors. |
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