珠江口盆地碳酸盐岩下构造深度校正探讨

doi:10.11978/2017081

Abstract

Abstract:

A pull-up seismic reflection imaging artifact is caused by the overlying high velocity layer, making the interpretation of the underlying strata inaccurate. This inaccuracy would make the oil & gas exploration difficult. A quantitative template of pull-up coefficient was set up based on the analysis of controlling factors and theoretical models. The structure underlying the high velocity layer can be restored by quantitative analysis of the amplitude of pull-up effect. The results show that the extent of pull-up was controlled by the rate and thickness of high velocity layer, and by the velocity of surrounding rocks. Moreover, the pull-up parameter had a linear relationship with the velocity of carbonate in template. On this basis, the geologic models were made, and the structure was analyzed in a test. It was indicated that this method could be more effective in imaging the structure.

Key words: the Pearl River Mouth Basin, high velocity layer, forward modeling, pull-up coefficient, structure restoration

CLC Number:

P738.4

Hao YI, Zhe WEI, Xuefei YI, Zhaoming CHEN, Jianyao WU. Seismic data depth correction of strata beneath the carbonate in the Pearl River Mouth Basin[J].Journal of Tropical Oceanography, 2018, 37(4): 97-104.

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References 10

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特征参量	灰岩	砂岩	泥岩
速度/(m•s^-1)	4300	3700	3650
密度/(kg•m^-3)	2600	2305	2500

围岩速度/(m•s^-1)	灰岩速度/(m•s^-1)	上拉系数a/(ms•m^-1)
	4300	0.105
3516	4800	0.155
	5300	0.195
	4300	0.08
3650	4800	0.13
	5300	0.17
	4300	0.07
3720	4800	0.115
	5300	0.155

井号	真实厚度/m	PSDM预测厚度/m	误差
A	44	30	14
B	172	114	58

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Seismic data depth correction of strata beneath the carbonate in the Pearl River Mouth Basin

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