分频振幅检测 “亮点”型浅层气的方法研究及应用

doi:10.11720/wtyht.2019.1337

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Abstract

The shallow layer of Bozhong A oilfield develops a large number of "bright spot" gas-bearing reservoirs.The identification of these reservoirs is seriously affected by the water-bearing reservoirs with the tuning thickness.To solve this problem,the authors,based on the difference of the main control factors of the strong amplitude caused by the gas and water layers,analyzed and summarized the amplitude energy response law of the different thickness of the gas layer and the water layer with tuned thickness,and proposed the method for detecting the shallow "bright spot" type gas layer by using the frequency-dividing amplitude.The method was successfully applied to the prediction of gas-bearing reservoirs in Bozhong A oilfield,and guided the well-appraisal proposal efficiently.This method can be potentially applied to the other gas-bearing reservoirs prediction in Bohai and provide reliable technical supports for well deployment of oil and gas exploration.

Key words： "bright spot" gas layers tuning thickness frequency-dividing amplitude

Received: 01 October 2018 Published: 31 May 2019

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	Articles by authors
	Shuan-Shuan KONG
	Zi-Jun HAN
	De-Long ZHANG
	Zhu QIAO
	Hong-Lei WEN

Cite this article:

Shuan-Shuan KONG,Zi-Jun HAN,De-Long ZHANG, et al. The study and application of the method using frequency division amplitude to recognizing "bright spot" shallow gas layers[J]. Geophysical and Geochemical Exploration, 2019, 43(3): 626-633.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1337 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I3/626

The cross-plots of geophysical parameters of wells

The double-wedge model (a) and its forward synthetic seismogram (b)

The relationship between amplitudes and thickness of gas layers and water layers

The relationship between amplitude and frequency of the synthetic seismogram of the double-wedge model

The rectangle model (a) and its forward synthetic seismogram (b)

The frequency-division profiles of the synthetic seismogram in fig. 5b

The reflection amplitudes of gas layers and water layers varies with the intensity of frequency

The flow diagram of the recognition of "bright spot" gas layers based on frequency-dividing amplitude

The frequency-division profiles crossed Well A1,and the lithological diagram of Well A1

The frequency-division profiles crossed Well A1,and the lithological diagram of Well A2

The max-amplitude attribute slices of frequency-division data in BoZhong A Oilfield.

Fig.10
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The seismic section crossed drilled wells along the white line shown in Fig.10

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