CASE STUDY OF OFFSHORE HIGH RESOLUTION SEISMOLOGY
HE HAN-YI (Exploration Research Center of CNOOC, Hebei, Gaobeidian 074000, China)
High -resolution seismic data was applied to evaluate DF1-l gas field for gasexploration in Yinggehai basin. The high- resolution seismic sections showed the waterchannels clearly, which truncated the gas reservoir, and a correct geological model ofthe gas field was given. The reservoir description given by the high-resolution seismicdata determined the gas/ water contact,the thickness and porosity of the reservoir. Allof this reduced the number of evaluation wells. With conventional seismic a dry hole was drilled on LD8一1 anticline, but the second well got high rate of gas Production after shooting high- resolution seism, on which there were both bright-spots and flat-spots. Practice proved that low frequency was more important than high frequencyfor high-resolution seismic . Seismic impedance section presented subsurface geologicalcondition more directly and clearly than seismic migration section, so interpretationand reservoir characterization using the seismic impedance data would Obtain better result .
【CateGory Index】： P618.130.8