叠前同时反演技术在珠江口盆地西部海域天然气水合物储层预测中的应用

doi:10.11720/wtyht.2019.0019

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Abstract

Weak BSR or no BSR is developed in western Pearl River Mouth basin.The conventional post-stack inversion obtains only one parameter,and it is difficult to accurately predict the gas hydrates distribution characteristics.Based on seismic gather optimization,fine velocity analysis,petrophysical analysis and accurate establishment of low-frequency models,the authors used pre-stack simultaneous inversion technology to predict gas hydrate reservoirs in western Pearl River Mouth basin,adopted facies and fluid probabilities analysis technology to comprehensively identify the gas hydrate reservoirs in the study area,and achieved a fine characterization of the gas hydrates.The inversion prediction results show that the gas hydrates are developed well in the study area,and the prediction results are consistent with the drilling results,implying that the application effect of pre-stack simultaneous inversion technology is ideal.

Key words： gas hydrates pre-stack simultaneous inversion reservoir prediction facies and fluid probabilities analysis western Pearl River Mouth basin

Received: 12 January 2019 Published: 31 May 2019

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	Articles by authors
	Zhi-Bin SHA
	Xiao-Ming WAN
	Zhong-Quan ZHAO
	Jin-Qiang LIANG
	Rui-Zhao YANG
	Yu BAI
	Yi CHAI

Cite this article:

Zhi-Bin SHA,Xiao-Ming WAN,Zhong-Quan ZHAO, et al. The application of pre-stack simultaneous inversion to gas hydrates reservoir prediction in the western Pearl River Mouth basin[J]. Geophysical and Geochemical Exploration, 2019, 43(3): 476-485.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.0019 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I3/476

Seismic section of the study area

Pre-stack simultaneous inversion process

Comparison of the seismic gathers before(a) and after(b) optimization

Comparison of the offset seismic gathers stacked data
a—The spectrum of full seismic gathers stacked data;b—The spectrum of near seismic gathers stacked data;c—The spectrum of medium seismic gathers stacked data;d—The spectrum of far seismic gathers stacked data

The spectrum of the offset seismic gathers stacked data
a—The spectrum of full seismic gathers stacked data;b—The spectrum of near seismic gathers stacked data;c—The spectrum of medium seismic gathers stacked data;d—The spectrum of far seismic gathers stacked data

Fine layer velocity section

Elastic parameter intersection diagram

Low frequency model of Pre-stack elastic parameters
a—low frequency model of P-wave impedance;b—low frequency model of S-wave impedance;c—low frequency model of density

Pre-stack inversion contrast section of P-wave velocity to S-wave velocity ratio and P-wave impedance
a—pre-stack inversion section of P-wave velocity to S-wave velocity ratio;b—pre-stack inversion section of P-wave impedance

Probability analysis of natural gas hydrate reservoir distribution

The contrast section of gas hydrate distribution probability
a—pre-stack inversion section of P-wave impedance;b—pre-stack inversion section of P-wave velocity to S-wave velocity ratio;c—the section of gas hydrate distribution probability

The map of gas hydrate reservoir distribution in the study area and samples obtained by drilling

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