Meandering reservoir architecture based on well-seismic analysis and its application:Taking the western slope area of Daqing Oilfield as an example
The SA I Formation of the Saertu oil layer in the western slope area of Daqing Oilfield is mainly com-posed of meandering channel sand deposits.The low accuracy of identifying the boundary of the point bar sand bodies and the internal abandoned channels restricts the development plan of horizontal wells.Therefore,based on high-density seismic data,we adopt the migration processing technology based on dynamic Q compensation to significantly improve the imaging accuracy of the channel sand bodies,clarifying the wave group characteris-tics of sand body point bars on meandering channels and the internal abandoned channels on seismic sections.To further highlight the internal heterogeneity characteristics of meandering channel sand bodies on the plane,we utilize a wedge shaped seismic forward model to establish the maximum thickness of sand bodies that can be re-cognized by seismic data volumes at different frequencies.RGB three-color fusion technology is used on three S-transform-based single frequency bodies selected according to the value range of sandstone thickness distribu-tion in the area to accurately predict the sand bodies with different thickness levels.At the same time,a re-sponse model of core facies-logging facies-seismic faciesis established for the boundary of the point bar sand bo-dies and the internal abandoned river channels,clarifying their oil-bearing properties.The research results show that the migration processing technology based on dynamic Q compensation has improved the recognition accu-racy of channel sand bodies on seismic sections.The frequency divider RGB attribute fusion technology based on S-transform can accurately predict abandoned channels,point bar boundaries,and the heterogeneity therein on the plane.The established response model of core facies-logging facies-seismic facies can accurately predict the oil-bearing properties of different types of sand bodies.The application research results guide the deploy-ment of 304 well locations.To be specific,the drilling success rate of 188 vertical wells reaches 98.0％,the ac-tual drilling length of 116 horizontal wells reaches 387.8 m,and the average encounter rate of oil-bearing sand-stones is 93.4％.
point barabandoned channelseismic forward modelingRGB fusionheterogeneity
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