Detection of Oil and Gas in Turbidite Fan System by Low-Frequency Shadows Method

Abstract

Abstract: In recent years, low-frequency shadows technique hase been applied effectively to detection of glutenite and reef-flat reservoirs, but seldom to turbidite fan system. The key for detection of low-frequency shadows is to make a good time-frequency analysis. In order to study the feasibility of low-frequency shadows for oil and gas detection in turbidite fan system, the generalized S transform (GST) is applied to transient spectral decomposition, creating a series of common frequency data volumes. Through detection of the amplitude energy variances of different frequencies, it is shown that the amplitude energy beneath turbidite fan reservoir is gradually weakened and disappeared with the frequency increasing, which is regarded as low-frequency shadows. The case study indicates that the seismic low-frequency shadows can directly indicate existence of oil and gas, thus in turbidite fan system, they are also taken as an effective method for reservoir prediction and oil-gas detection.

Key words: low-frequency shadows, turbidite fan, spectral decomposition, oil-gas detection, generalized S transform

CLC Number:

P631.445

LIU Wei, HE Zhen-hua, CHEN Xue-hua, WENG Bin, JIANG Xiu-di. Detection of Oil and Gas in Turbidite Fan System by Low-Frequency Shadows Method[J]. Xinjiang Petroleum Geology, 2011, 32(6): 609-612.

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