Lithologic Reservoirs ›› 2012, Vol. 24 ›› Issue (5): 98-102.doi: 10.3969/j.issn.1673-8926.2012.05.018

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Application of frequency attenuation attributes to oil and gas exploration in deep carbonate rocks

YANG Lu 1，2， HE Zhenhua 1，2， WEN Xiaotao 1，2， YANG Xiaojiang 1，2， SHENG Qiuhong3   

  1. 1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation， Chengdu University of Technology， Chengdu 610059， China； 2. College of Geophysics， Chengdu University of Technology， Chengdu 610059， China； 3. Southern Exploration Company， Sinopec， Chengdu 610041， China
  • Online:2012-10-20 Published:2012-10-20

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Abstract:

According to deep burial depth, uneven oil and gas distribution of carbonate reef flat lithologic reservoir of Changxing Formation in BL area, this paper put forward a train of thought for hydrocarbon detection which combined frequency attenuation attributes and low frequency ad joint-shadow phenomenon. This paper first introduced the principle of frequency attenuation attributes and low frequency ad joint-shadow phenomenon; secondly established geological model combined with the reservoir physical parameters of Changxing Formation in BL area, and simulated and analyzed the seismic response characteristics of the reservoir by using viscosity-diffusivity wave equation. The model analysis result shows that it is feasible to detect gas-bearing properties of reservoir by using frequency attenuation attributes and low frequency ad joint-shadow phenomenon. Application of real data demonstrates that frequency attenuation attributes and low frequency ad joint-shadow phenomenon has good instruction to the reservoir, and improved the accuracy of reservoir prediction and fluid detection, which can provide a way for oil-gas identification and
fluid detecttion of carbonate reef flat lithologic reservoir and similar reservoirs of Changxing Formation in BL area.

Key words: gas source faults, cap rocks, space matching relation, time matching relation, gas accumulation, Xujiaweizi Depression

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