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Petrophysical analysis of a pre-salt carbonate reservoir using well logs

Grant number: 20/01320-2
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): March 01, 2020
Effective date (End): February 28, 2023
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Geology
Cooperation agreement: Equinor (former Statoil)
Principal Investigator:Alexandre Campane Vidal
Grantee:Bruno Wamzer Jeiss
Home Institution: Centro de Estudos do Petróleo (CEPETRO). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Associated research grant:17/15736-3 - Engineering Research Centre in Reservoir and Production Management, AP.PCPE

Abstract

The carbonate rocks from Brazilian pre-salt interval are highly heterogeneous in terms of texture, pore systems and diagenetic history, constituting an unusual sedimentary sequence and its elements are associated to restricted depositional systems that do not have current models, which makes it difficult to adopt a distribution pattern of petrophysical properties. Considering that porous rock systems are generally multimodal, especially in carbonates, and present a high variation in pore size (fractures, vugs and microporosity), one of the current challenges for the characterization of carbonates is the definition of a petrophysical model that integrates the different porosity scales. In this context, the importance of integrating conventional and special well logging, such as NMR and Image logs, to access the different porosity scales and therefore create a representative petrophysical model, respecting the geological properties such as the dual/triple porosity systems. The nuclear magnetic resonance (NMR) logging has emerged as one of the advanced technologies for in-situ reservoir evaluation. NMR logging is able to capture important formation properties that the classical logs have no sensitivity, providing information about porosity, pore size distributions, permeability and fluid characterization. Several studies have used NMR measurements to characterize carbonate reservoirs. The fullbore formation microimager (FMI) is an important tool to guide the geologic interpretation of reservoirs. Through this, lots of information about depositional, diagenetic, and structural features can be measured and inferred by combination with other sources as well logs and core samples. The activities in which the present research project will focus are petrophysical and facies analysis of the reservoir, using conventional wireline well logs and special well logs such as NMR and FMI, to obtain a representative and multiscalar characterization of the carbonate reservoir. (AU)