Study Of Seismic Fine Description Method On Glutenite Reservoir In Yan222 Area

In this paper,the Yan222 area was selected as an example.In the literature research,wellseismic calibration,fine interpretation of 3D seismic data,analysis of seismic facies characteristics,sequence division and sedimentary facies description,glutenite reservoir predictions,the glutenite reservoir in the area was introduced and analyzed in details.The results with a practical significance and guidance were obtained,and the multiple methods were summarized to develop a seismic description software of glutenite reservoirs.The software could contribute to a more convenient application and promotion.The study area was proved to have a good corresponding relationship between the paleogully and fan through the investigations on the paleogeomorphology,sedimentation,logging and fine seismic interpretation of the target interval.The Yan22 near-shore subaqueous fan was formed in front of the Yan16 paleo-gully.Then,it collapsed and formed Yan222 area with the action of gravity.From a whole view,the material supply of the study area is abundant and the thickness of reservoir is large.The logging curve showed that the SP,AC,and GR curve have abrupt changes in the reservoir position.The conclusions of the seismic facies characteristics were presented as follow: First,the results of the forward modeling showed that the glutenite had high velocity characteristics.Therefore,the envelope surface appeared in the trend profile,and the time rise phenomenon of the bottom surface appeared in the strike profile.With increasing the thickness of the mudstone interlayer inside the glutenite,the seismic reflection event axis had a better continuity,which was beneficial to sequence division;Second,it could be seen that the distribution and changes of the Yan22 and Yan222 fan by time slices,respectively;Third,the seismic attribute technology was applied to the study of the glutenite envelope surface.It was found that the response effects of zero crossing count attribute with the reservoir were better.Combined with the strata slices,the distribution changes of the glutenite reservoirs according to the deposition period was exhibited.Synchrosqueezing wavelet transform has the characteristics of the good energy accumulation,stronger noise resistance,and high time-frequency resolution.In this paper,it was applied to the sedimentary cycle analysis and sequence division.Based on the velocity changes inside the fan body,the sedimentary facies were divided for each period through the comprehensive analysis of velocity dispersion attribute and conventional seismic attributes.Wave impedance inversion results showed that the glutenite of Es4 s is mainly developed in its middle and lower parts.Thickness of the glutenite in Yan22 and Yan222 well areas is large,and the connecting parts between the two are also well developed.The root of glutenite fan is densely deposited,and it is characterized by high velocity and high impedance.The software was developed according to the modular development by summarizing the multiple description methods of glutenite reservoir.It realized the linkage call of C# and Matlab programs,which could be helpful for the use and promotion of the methods.