Seismic Recognization Techniques Of Stratigraphic And Lithologic Traps In The Eastern Lungu Area

The eastern Lungu area in the Tarim Basin is a favorable region for discovering new stratigraphic and lithologic traps and ascertains old ones. At the same time, it is an actual area for delicate applying seismic interpretation method & technique. So, take it as the area to research stratigraphic and lithologic traps, there are good reality conditions and actual senses. Aiming at the gordian technique of Seismic recognization techniques, taking the eastern Lungu area as an example, this article proceed tapping potential. The main research as follows:On the basis of logging curve correction, think through the question of phase displacement in the seismic wave propagation, adopt the method of constant frequency and phase correction with time division, use fitness the main frequency and phase message carried by the seismic wave at well-side objective interval, then, we can define adaptive wavelet attribute. Complete the technique of seismic-well tie, which acquires a good base for recognization of stratigraphic and lithologic traps.Using the technique of virtual reality to scan multi-properties 3D seismic body and detect object trap quickly, the horizon and fault interpretation accuracy degree and efficiency have been improved obviously.Taking the reference layer as mark, make a new seismic body by flatten the reference layer. Then skim through the data from bottom to top, analysis the variance of strata dip on the time slice, interpret and recognize the location of unconformable surface, distinguish the formation of upper and lower, complete the unconformable surface sharp of the flattened body, refer to the well data and complete thin bed pinch recognize. The recognition capability about the pinch-out lines and the seismic ability to identify has been enhanced obviously.To forecast the strata thickness of the clastic rock by using a spectral decomposition technique, the author finds that simply using tuning frequency to forecast the thickness results a greater error. Find that the interpretation relation about the frequency thickness of the thin layer variation in thickness, which is in the condition of the same time thickness, during the research of modeling. In the research of the fractured-vuggy carbonate reservoirs, the author has further demonstrated the differences of the spectral decomposition results between the big and small fractured-vuggy reservoirs by identifying their spectral decomposition characteristics and the research of the spectral decomposition about the forward modeling results. This may propose research method for reservoir bed pre-determination on surface.In short, by the applying in the eastern Lungu area, the seismic reorganizations techniques of stratigraphic and lithologic traps gain development and completeness,. Furthermore, it makes contribution to the exploration discovery.