Study On Seismic Prediction Method Of Shale Oil Reservoir Sweet Spot

The key point of oil and gas exploration is to find oil and gas resources,and seismic exploration is the most important method,which plays a crucial role in the prediction of favorable areas for shale oil.However,unconventional oil and gas are different from conventional oil and gas resources in terms of enrichment mechanism,distribution law,exploration and development mode,etc.Therefore,this thesis mainly adopts the method of combining well and seismic,starts from geological and engineering sweet spots,and makes comprehensive prediction based on different "sweet spots" elements.Firstly,post-stack inversion and pre-stack inversion techniques were used to predict the geological sweet spot,and the reservoir thickness and TOC content were analyzed.Secondly,prestack inversion technology and seismic attribute analysis are used to predict the "sweet spot" of the project to analyze the brittleness and fracture development of the reservoir.Finally,comprehensive prediction of favorable shale oil sweet spot is made by using sweet spot factors such as reservoir thickness and brittleness.According to the analysis of three "sweet spots" divided by logging,the favorable spots of sweet spots 1 are distributed in the central and western part of the work area,and sweet spots 2 and 3 are distributed in the northwest part of the work area.The general characteristics are as follows: large thickness,good source rock quality,low Vp/Vs,high brittleness index and fracture development.The "sweet spot" area is verified in the actual production,forming a kind of "sweet spot" prediction process that can be used for reference,which has important reference value for the area similar to this research area.