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Ahead of Print Abstract
AAPG Bulletin, Preliminary version published online
Copyright © 2023. The American Association of Petroleum Geologists. All rights reserved.
Seismic sedimentology of a broad, low-relief carbonate platform: the Cambrian Longwangmiao Formation, Moxi-Gaoshiti area, Sichuan Basin, China
1 PetroChina Research Institute of Petroleum Exploration and Development, Beijing, China
2 Bureau of Economic Geology, Jackson School of Geosciences, The University of Texas at Austin
Ahead of Print Abstract
Conventional core and wireline-log data indicate that carbonate lithofacies are comprised of completely dolomitized grainstones, packstones, and wackestones to mudstones. Associated depositional environments were interpreted as shoal complex (shoal-crest, shoal-margin, and intershoal), lagoon, and deep shelf. The low (4-8%) porosity reservoirs are largely related to the shoal complex facies. Two third-order sequences were correlated throughout the field area, each demonstrating an upward-shallowing trend. The reservoir-quality rocks were formed in the highstand-system tracts in the sequences.
Lacking diagnostic shallow-water indicative seismic facies (e.g., the topset of clinoforms), seismic paleogeomorphology was assessed by restoring the paleostructure at the top of LWM and then evaluating gross thickness of LWM to establish the accumulation rate of sediments across the area. This approach demonstrated a fair correlation to measured reservoir-thickness data from wireline logs, indicating that the paleogeomorphology and depositional facies were largely controlled by a syndepositional, en echelon fault system that determined the distribution of shallow-water shoal complexes and deeper shelf areas across the field area. Seismic lithology determination by amplitude analysis of multiple frequency panels provided a quantitative assessment of reservoir distribution, supplementing the qualitative paleogeomorphologic maps for field development and reservoir modeling.
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