Variable velocity mapping based on structure-fluid coupling constraints and its successful application in A Gas Field in the East China Sea

TU Qicui; LOU Min; MAO Yunxin; WANG Wei; HUANG Xin; LI Bingying; WANG Lamei; CHEN Yizhou

doi:10.16028/j.1009-2722.2021.219

2022 Vol. 38, No. 12

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Article navigation > Marine Geology Frontiers > 2022 > 38(12): 56-63

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TU Qicui, LOU Min, MAO Yunxin, WANG Wei, HUANG Xin, LI Bingying, WANG Lamei, CHEN Yizhou. Variable velocity mapping based on structure-fluid coupling constraints and its successful application in A Gas Field in the East China Sea[J]. Marine Geology Frontiers, 2022, 38(12): 56-63. doi: 10.16028/j.1009-2722.2021.219

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TU Qicui, LOU Min, MAO Yunxin, WANG Wei, HUANG Xin, LI Bingying, WANG Lamei, CHEN Yizhou. Variable velocity mapping based on structure-fluid coupling constraints and its successful application in A Gas Field in the East China Sea[J]. Marine Geology Frontiers, 2022, 38(12): 56-63. doi: 10.16028/j.1009-2722.2021.219

Variable velocity mapping based on structure-fluid coupling constraints and its successful application in A Gas Field in the East China Sea

Shanghai Branch of CNOOC（China）Ltd, Shanghai 200335, China

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Corresponding author: LOU Min, loumin2@cnooc.com.cn

Received Date: 19 August 2021

Publish Date: 28 December 2022

Abstract

Abstract

Time-depth conversion is one of the key steps in structural interpretation. It includes mainly two categories: constant-velocity mapping and variable-velocity mapping. The constant-velocity mapping is not suitable for a work area whose lateral velocity field changes intensely. The key point of this paper is to establish a time-depth conversion method that is suitable for the field with variation of lateral velocity and in accordance to the geological characteristics, for which an iterative variable velocity mapping technique was developed based on the inversion of superposition velocity, and the results of hydrocarbon detection were integrated. The iterative mapping technique was applied to the mapping of various complex underground structures, and the results are consistent with the distribution of hydrocarbon and geological implications. In addition, by using the iterative mapping technique, the controversy between structural gas reservoir area, "bright spot" area in the A Gas Field was well solved, and the geological reserves were expanded, and the construction and development of A Gas Field was effectively promoted.
- velocity modeling /
- hydrocarbon detection /
- variable-velocity mapping /
- time-depth conversion /
- forecast of depth

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References

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