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Natural Gas Geoscience ›› 2019, Vol. 30 ›› Issue (9): 1378-1385.doi: 10.11764/j.issn.1672-1926.2019.04.012

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Analysis of the influence of P-S wave velocity variation on AVO type in the Dongfang area, Yinggehai Basin

Yong Deng(),Shi-you Liu,Yang-sen Li,Chen Fu,Li-xia Shen   

  1. Zhanjiang Branch Company, China National Offshore Oil Corporation, Zhanjiang 524057, China
  • Received:2019-02-28 Revised:2019-04-24 Online:2019-09-10 Published:2019-10-14

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Abstract:

Because of the special temperature and pressure environment and formation mechanism in Dongfang area, low-speed mudstone develops especially, while low-speed mudstone and gas-bearing sandstone show relatively similar seismic facies and AVO characteristics, so the effect of identifying sandstone by AVO technique is not ideal. In order to effectively analyze the AVO characteristics of sandstone and mudstone in this area, this paper analyzes the influence of the relative variation of elastic parameters on AVO reflection coefficient based on the simplified formula of Zoeppritz equation. On this basis, the variation rule of gas-bearing sandstone of Huangliu Formation in Dongfang area with depth is clarified. It is clear that the shear wave velocity is the main factor affecting the response characteristics of III and IV types of gas-bearing sandstone in this area. Finally, the same IV type gas-bearing sandstone and low-speed mudstone are analyzed, and the IV type AVO anomaly of low-speed mudstone is more obvious. In order to distinguish the low-speed mudstone and gas-bearing sandstone effectively, the combination of petrophysics and prestack simultaneous inversion can effectively eliminate the impact of low-speed mudstone traps and provide important technical support for reservoir prediction and hydrocarbon detection in the Dongfang area.

Key words: Yinggehai Basin, Bright point, AVO analysis, Low velocity mudstone, Prestack inversion

CLC Number: 

  • TE132.1+4

Fig.1

Comparative of the contribution of different parameters to the reflection coefficient of AVO"

Fig.2

Comparative of the contribution of AVO reflection coefficients of class III and IV"

Fig. 3

The relationship of density，p-wave and s-wave velocity with depth in Huangliu Formation of Dongfang area"

Fig. 4

The relationship between AVO intercept, gradient and depth in Dongfang area"

Fig.5

Well logging curve of Wells X-4 and X-6 in Dongfang area"

Fig. 6

Analysis of AVO characteristics of gas-bearing sandstone and low-speed mudstone"

Fig. 7

Rocks physical analysis of sandstone and low-velocity mudstone"

Fig.8

Seismic profile and prestack inversion results of Wells X-4-X-6 in DongFang area"

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