| In the Central Ordos Basin,the area with relatively simple structure and excellent reservoir conditions has gradually entered the late stage of development.Under the condition of high pressure of production of natural gas,the exploration target continues to advance to the southwest area with complex reservoir forming conditions and poor reservoir development.It is particularly important to study the reservoir prediction method and guide the optimization of favorable targets in the southwest of Ordos Basin.Taking Longdong area in the southwest of Ordos basin as an example,this thesis studies the reservoir prediction and favorable target optimization of Shan 1 tight sandstone gas reservoir,the main reservoir section of upper paleozoic.According to the characteristics of thin reservoir,poor physical properties and strong transverse discontinuity in the target section of the research work area,reservoir prediction methods including pre-stack elastic wave impedance inversion are adopted.The results show that reservoir distribution and fluid distribution can be effectively predicted by combining pre-stack elastic wave impedance inversion thickness prediction,post-stack single frequency body thickness prediction,fluid mobility attribute oil-gas prediction.The results show that for tight sandstone gas reservoirs in this area,the comprehensive attribute analysis target optimization can effectively describe the structure and distribution of the target sand body and indicate the favorable gas bearing target area. |
