Sub-salt Structure Trap Identification And Evaluation Of Carboniferous Of Pre-Caspian Basin

The oil and gas reserves of Pre-Caspian basin account for 80%of the total reserves from carbonate rock sub-salt. Pre-Caspian basin developed margin of carbonate rock in the eastern and found oil and gas reservoir belongs to the tectonic-lithological reservoir. But the salt brings many technical problems for oil and gas exploration, including speed, reservoir prediction and salt-associated traps identification. Firstly, the salt domes is high-speed geological body, sub-salt structural illusion caused by thick high-velocity salt domes in time domain seismic section, make it difficult to sub-salt structural identification; secondly, the heterogeneity of carbonate reservoir sub-salt is strong, Effectively reservoir space control hydrocarbon, and reservoir has the characteristics of layered, complex oil-water relationship, Mainly for the diversity of lithology and reservoir property change quickly.According to salt rock geological characteristics and geophysical characteristics of the central block, has developed a technology research ideas and countermeasures of trap identification and evaluation of a complex trap sub-alt. Mainly carried out seismic data processing and interpretation technology research, through the structure oriented filtering processing, coherent processing, curvature processing technology of seismic data, to fine characterize salt domes. On this basis, combined with logging data in the work area, through the development of true fault recognition and elimination, a split velocity model, study the map of geophysical technology into gear, completed a three-dimensional region under salt structure correction and identification of subsalt structural traps, establish the trap identification matching technology of salt. Through the analysis of drilling and logging in the area, combined with seismic data, selection of sensitive parameters of oil and gas, response spectrum characteristics, carried out under salt Carbonate rock reservoir prediction and fluid detection technology research, completed the three-dimensional area salt trap evaluation. Summary and the establishment of sub-salt complex structural traps recognition, carbonate rock reservoir prediction, fluid detection technology series, thus forming a complete overseas salt basin exploration and evaluation technology of form a complete set.