A Method for Defining Sedimentary Characteristics and Distributions and Its Application in Qinnan Depression, Bohai Bay Basin

A new method incorporating geophysical analysis and geological analysis is proposed to define the sedimentary characteristics and distributions in basins with few drilling wells to promote the exploration of reservoirs. This method is applied to a study, through which its principles, closed-loop wor...

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Bibliographic Details
Published in:Processes 2023-09, Vol.11 (9), p.2539
Main Authors: Zhang, Zehua, Xu, Chunqiang, Wang, Chenjie, Li, Hong, Zhu, Wensen, Wang, Hongliang, Liang, Kaixuan, Su, Yong
Format: Article
Language:English
Subjects:
Basins
Basins (Geology)
Belts
Closed loops
Deltas
Deposition
Drilling
Geology
Geomorphology
Gullies
Methods
Natural gas exploration
Oil and gas exploration
Oil exploration
Oil well drilling
P waves
Reservoirs
Rivers
Sand
Sediments
Sediments (Geology)
Stratigraphy
Wave propagation
Wave velocity
Workflow
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Summary:A new method incorporating geophysical analysis and geological analysis is proposed to define the sedimentary characteristics and distributions in basins with few drilling wells to promote the exploration of reservoirs. This method is applied to a study, through which its principles, closed-loop workflow and technologies are introduced in detail and the sedimentary characteristics and distributions of the study area are accurately defined. During the application process of the method, a compatible geological model is established, based on which the seismic data are interpreted and the results derived from the interpretation are further verified via seismic forward modeling. The study results exhibit a successive sand-rich deposition from the retrogradational gully-filling gravity flow deposition including near-shore fans, slope fans and basin-floor fans delimited by different slope break belts in transgressive sequences to the progradational delta deposition in a retrogressive sequence including braided river deltas with a long extension distance and fan deltas developed along a steep slope belt. And the potential reservoirs are located at the point-out sites of sand bodies with lower average P-wave velocities than those of muddy sediments. The proposition and application of this method are of great significance for oil and gas exploration.
ISSN:2227-9717
2227-9717
DOI:10.3390/pr11092539