Fine Characterization of Sedimentary Microfacies Based on RGB Frequency Division Fusion Technology of Seismic Attributes

Abstract

The conventional sedimentary microfacies analysis is based on the characteristics of logging facies. After years of field practice, it has achieved good results, but it is difficult to characterize the thin and narrow channel sand body under the condition of thin well pattern. In this paper, taking the T oil layer in S area of Songliao Basin as an example, the sedimentary microfacies combined with well and earthquake are finely characterized by using the RGB frequency division fusion technology of seismic attributes and the tuning response characteristics of high-frequency components of seismic attributes to thin layers. The results show that: 1) the seismic attribute RGB frequency division fusion technology has a good prediction effect on the distributary channel sand body of T reservoir. A total of 8 distributary channels are identified in two RGB attribute slices of upper and lower sandstone formations. 2) T oil layer in the study area is a shallow water delta sedimentary system. Reservoir T in the study area is a shallow water delta sedimentary system, and the distributary channel sand body under the control of northern provenance is continuously developed and small in scale. There are mainly 5 sedimentary microfacies: distributary channel, overflow sand, sheet sand, sand bar and distributary bay. 3) T oil layer has experienced the vertical evolution process of water retreat before water advance. The development scale of distributary channel in TI4₂-TI6 time unit in the maximum period of water retreat in the middle is the largest, which is the main horizon for the development of high-quality reservoir.

Copyright 2022, IFEDC Organizing Committee

This paper was prepared for presentation at the 2022 International Field Exploration and Development Conference in Xi’an, China, 16-18 November 2022.

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