番禺A地区时深转换速度精细研究及应用

doi:10.11720/wtyht.2023.1276

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Abstract

As shown by appraisal wells in structure A in Panyu District, the actual trap geometry differs significantly from its pre-drilling understanding. The analysis shows that the difference is mainly caused by the velocity anomalies in the middle-shallow layers. Breaking through the conventional methods for velocity modeling and correction, this study proposed a new method for velocity correction and variable velocity mapping suitable for the target area. In this method, the causes of velocity anomalies were analyzed based on well data, and then the velocity anomalies were ingeniously combined with seismic amplitude. Accordingly, the trend surface with geological significance for velocity anomaly correction and corrected interval velocities were obtained. The resulting depth-structure map with errors of less than 5 m effectively presented the trap geometry. This study provides a certain reference for the subsequent ascertainment of structures in the same geological setting.

Key words： time depth conversion velocity correction varying velocity mapping structural implementation

Received: 14 June 2022 Published: 11 October 2023

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	Articles by authors
	Han-Qing LIU
	Ming LUO
	Ye HE
	Wei-Tao CHEN

Cite this article:

Han-Qing LIU,Ming LUO,Ye HE, et al. Fine-scale study and application of velocity-based time-to-depth conversion of the A area, Panyu District[J]. Geophysical and Geochemical Exploration, 2023, 47(4): 1056-1063.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1276 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I4/1056

Thickness of Paleogene strata in Xijiang depression base and location of Panyu A structure

The comparison chart of time-depth relationship of three kinds of data in well A3

The time-depth mapping of three wells in Panyu A area

Prediction depth error of multi-well fitting time-depth in Panyu A area

Comparison of DT velocity with PSDM velocity before and after well calibration in Hanjiang Formation and Zhujiang Formation

Layered position map of ZH110 layer on two sets of PSDM-T and PSDM data

Comparative map of PSDM speed and DT speed of three drilled wells in Panyu A area

Statistics on sand content of three wells in Panyu A area

Characteristics of amplitude abnormal reflection in Panyu area A of lower the pearl River Formation

Relationship between amplitude properties and residual velocity corrections of the lower Zhujiang Formation in Panyu A area

Residual velocity correction contour plane of the lower Zhujiang Formation in Panyu A area

Depth structural map of target layer in Panyu A area

The flow chart of the structural implementation in Panyu A area

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