Evolution and Quantitative Delineation of Fluvial Channel Sandbodies in Block SA of the South Turgay Basin, Kazakhstan

doi:10.11885/j.issn.1674-5086.2016.08.09.01

Abstract

Abstract: Effective delineation and evaluation of fluvial channel sandbodies are impeded by their rapid lateral variations. In this study, frequency detection, phasing, stratal slicing, geological engraving, and other techniques were comprehensively applied to study the characteristics and duration of channel development in the Upper Jurassic Akshabulak Formation, located in Block SA of the South Turgay Basin. First, the possible existence of two stages of channel sedimentary bodies with different tuning thickness was detected within the target segment using the frequency-division method. Next, wave impedance analysis and 90° phase conversion revealed relatively good agreement between the seismic negative amplitude of the target segment and channel sands. Lastly, based on a high-frequency sequence stratigraphic framework, two types of channel sands from different stages were identified and delineated using isochronous stratal slicing; single-well calibration analysis of the characteristics of channel sedimentation were combined with the amplitudes of typical stratal slices. A comprehensive analysis of various parameters, including channel sinuosity, width-thickness ratio, and reservoir volume, suggests that the early-stage channel had characteristics of a meandering river with low sinuosity. In contrast, the late-stage channel was a delta plain distributary channel, with the characteristics of a flat, straight river. In addition, the channel had a significantly higher reservoir volume in the early stage compared to the late stage.

Key words: frequency detection, phasing, stratal slicing, fluvial channel identification, seismic sedimentology, South Turgay Basin

CLC Number:

TE122

GUO Kai, ZHAO Ruichun, FAN Leyuan, HU Shengli, LI Yang. Evolution and Quantitative Delineation of Fluvial Channel Sandbodies in Block SA of the South Turgay Basin, Kazakhstan[J]. 西南石油大学学报(自然科学版), 2018, 40(1): 59-67.

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