In:
Frontiers in Earth Science, Frontiers Media SA, Vol. 12 ( 2024-5-20)
Abstract:
Recent exploration has revealed that the Middle Triassic Leikoupo Formation 3 2 Submember (T 2 l 3 2 ) in the Sichuan Basin contains unconventional marl reservoirs with significant natural gas potential. Due to limited cores, old wells, and conventional logs, however, the lithological understanding of T 2 l 3 2 is incomplete and relies solely on inaccurate mud logs. This lack of lithological foundation challenges geology and petroleum research. To identify complex lithology, this paper presents a double-hierarchical workflow to identify seven types of lithology using logs. The first order distinguishes salt, anhydrite, and marl, while the second order further subdivides marl into anhydrite marl, argillaceous limestone, shaly limestone, and limy shale. Different rocks’ logging response characteristics are summarized based on quantity-limited cores and micro-resistivity imaging logs. Lithological identification of 2D and 3D plots is established using sensitive GR, DEN, and RT. Corresponding identification standards are built in two hierarchies. According to these standards, the lithology of T 2 l 3 2 is identified in a total of 119 wells. Finally, the lithological characteristics of vertical, horizontal, and plane are discussed in the research area. The research results may aid in comprehending the entire lithological characteristics of the complex marl reservoir in T 2 l 3 2 of the Sichuan Basin. It would help the exploration potential of petroleum systems in turn.
Type of Medium:
Online Resource
ISSN:
2296-6463
DOI:
10.3389/feart.2024.1411126
Language:
Unknown
Publisher:
Frontiers Media SA
Publication Date:
2024
detail.hit.zdb_id:
2741235-0
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