Reservoir Prediction Of Xiaoheba Formation In Southeast Sichuan

The process of getting underground lithology information by seismic profile is seismic inversion,which is based on the geological and logging data.The key of this technique as follows,horizon locating,low-frequency model building,time-depth conversion,resolution improving and wavelet extracting.Because of higher resolution,easier quantitative calculation of reservoir and elaborate geological interpretation,seismic inversion is the most important quantitative calculation method nowadays.Meanwhile,combining with geological and logging data,seismic attributes analysis is a way basing seismic attributes and finding hiding information,then researching reservoir feature.It basically figures out deposition boundary and reservoir qualitative analysis.The research area is located between steep tectonic belts in eastern Sichuan basin and low-middle tectonic zone in southern where is next to Dachigan gas field and Datianchi gas field.Tight sandstone is developed in Xiaoheba Formation over here.Well JS1 was drilled industrial gas flow about 5.2×10~4m~3 per day in Silurian Xiaoheba Formation in 2006.Moreover,Well SX1 also found gas flow in that formation.In order to studying reservoir features and forecasting reservoir,drilling data,logging data and seismic profile are utilized in this paper.Combining with geology and seismic data,seismic faces are used to analyze sedimentary environment,logging data and forward modeling are used to research geophysical response characteristics.The perfect method of reservoir predicting as follows,sensitive seismic attributes are extracted to describe the horizontal boundary of sand,then appropriate seismic inversion are applied to forecast reservoir,comprehensive evaluation of reservoir is processd finally.The Xiaoheba Formation is divided to 3 types of favorable exploration zones,1 for type?,1 for type?and 1 for type?.