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A successful qualitative and quantitative integrated interpretation of lower Miocene wells and seismic data in Salina del Istmo Basin, Mexico

Manuel Gonzalez-Quijano, Gregor Baechle, Miguel Yanez, Freddy Obregon, Carmen Vito and Pedro Vieira
A successful qualitative and quantitative integrated interpretation of lower Miocene wells and seismic data in Salina del Istmo Basin, Mexico (in Latin America, Antonio J. Velasquez (editor), Wagner Moreira Lupinacci (editor) and Carlos Eduardo Molinares (editor))
Leading Edge (Tulsa, OK) (December 2021) 40 (12): 897-904

Abstract

The study area is located in middepth to deep waters of the Salina del Istmo Basin where Repsol operates Block 29. The objective of this work is to integrate qualitative and quantitative interpretations of rock and seismic data to predict lithology and fluid of the Early Miocene prospects. The seismic expression of those prospects differs from age-equivalent well-studied analog fields in the U.S. Gulf of Mexico Basin due to the mineralogically complex composition of abundant extrusive volcanic material. Offset well data (i.e., core, logs, and cuttings) were used to discriminate lithology types and to quantify mineralogy. This analysis served as input for developing a new rock-physics framework and performing amplitude variation with offset (AVO) modeling. The results indicate that the combination of intercept and gradient makes it possible to discriminate hydrocarbon-filled (AVO class II and III) versus nonhydrocarbon-filled rocks (AVO class 0 and IV). Different lithologies within hydrocarbon-bearing reservoirs cannot be discriminated as the gradient remains negative for all rock types. However, AVO analysis allows discrimination of three different reservoir rock types in water-bearing cases (AVO class 0, I, and IV). These conclusions were obtained during studies conducted in 2018-2019 and were used in prospect evaluation to select drilling locations leading to two wildcat discoveries, the Polok and Chinwol prospects, drilled in Block 29 in 2020.


ISSN: 1070-485X
EISSN: 1938-3789
Serial Title: Leading Edge (Tulsa, OK)
Serial Volume: 40
Serial Issue: 12
Title: A successful qualitative and quantitative integrated interpretation of lower Miocene wells and seismic data in Salina del Istmo Basin, Mexico
Title: Latin America
Author(s): Gonzalez-Quijano, ManuelBaechle, GregorYanez, MiguelObregon, FreddyVito, CarmenVieira, Pedro
Author(s): Velasquez, Antonio J.editor
Author(s): Lupinacci, Wagner Moreiraeditor
Author(s): Molinares, Carlos Eduardoeditor
Affiliation: Repsol USA, The Woodlands, TX, United States
Affiliation: Ecopetrol Oleo e Gas do Brasil, Rio de Janeiro, Brazil
Pages: 897-904
Published: 202112
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 11
Accession Number: 2022-004636
Categories: Economic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., sketch map
N18°00'00" - N30°04'00", W98°00'00" - W80°30'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 2022
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