Reservoir Seismic Prediction In Qujing Basin, Yunnan

Qujing Basin is one of Tertiary sedimentary basins,which with the discovered gas resources in Yunnan Province,as a Tertiary fault-subsidence lacus rine residual basin,it is formed under the regional strike-slip tectonic stress.Reservoir seismic prediction is performed mainly by analyzing the interspace movement of the lithology,reservoir physical character and inside fluid attribution which result out as the corresponding changes of seismic reflection wave velocity,amplitude,phase,frequency and wave shape,therefore to predict the distribute scope and formation character of reservoir Reservoir seismlc prediction is the core technique of lithofogy formation oil/gas exploration According to utilizing the seismic, logging data, the structure of formation in Qujing basin was explained, tectonics and stratigraphic distribution was also acquired.Combined with analysis of the seismic and single well facies.this paper extracted seismic intrabed attributes in unit of segments, reservoir distribution of primary target formation in Qujing basin was acquired.The main achievement and understanding are generalized as follows:1.Qujing Basin is a Tertiary fault-subsidence lacus rine residual basin .Structure traps and the match model between structure and fracturation system (Shizhong fracturation and Xiaojiang fracturation)were the main factors in controlling the formation of effective traps.2.The reflection structure of sandstone in the seismic section of Qujing Basin was hill-type and lenticular. The reflection characteristics of gas-bearing sandstone were low frequency and high amplitude.The pre-stack AVO attribute was belong to typeâ…¢. The seismic reflection characteristics of multi-wavelet decomposition profile were low intensity and high frequency weak.3.Based on analysing of the controlling factors of gas reservoir ,trap effectivity, and the seismic response characteristics,By combining with the identification results of seismic and well logging interpretation,the geological model was established and was provided the basis data for exploratory.