Multidisciplinary Characterization of Unconventional Reservoirs Based on Correlation of Well and Seismic Data

Weronika Kaczmarczyk,Małgorzata Słota-Valim

doi:10.3390/en13174413

Weronika Kaczmarczyk, Małgorzata Słota-Valim

Open Access

https://doi.org/10.3390/en13174413

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Journal: Energies	Publication Date: Aug 26, 2020
Citations: 2	License type: CC BY 4.0

Affiliation: Oil and Gas Institute - National Research Institute

Abstract

Combinatorial analysis of key petrophysical parameters can provide valuable information about subsurface hydrocarbon reservoirs. This is particularly important for reservoirs with unconventional rock formations that, due to the low permeability, need to be stimulated by fracturing treatment to provide fluid flow to the exploitation wellbore. In this article, based on data from unconventional shale formations (N Poland), we outline how independent sets of elastic and petrophysical parameters and other reservoir features can be co-analyzed to estimate the fracture susceptibility of shale intervals, which are characterized by a high total organic carbon (TOC) content and high porosity. These features were determined by analysis of each horizon’s elastic and mineralogical brittleness index (BI). These two variants were calculated first in 1D; integrated with the seismic data and finally compared with other parameters such as acoustic impedance, ratio of compressional and shear wave velocities, porosity, and density; and then presented and analyzed using cross plots that highlighted the key relationships between them. The overall BI trends were similar in both horizontal and vertical directions. The highest BI values were observed in the southeast of the analyzed area (Source I) and in the southeast and northwest of the area (Source II). These results can form the basis for predictive modeling of reservoir properties aiding effective reservoir exploration.

Highlights

Comprehensive reservoir characterization requires the use of a wide range of geophysical and petrophysical data; it is often unclear which sets of parameters provide the most important information about a reservoir rock
By contrast with compressional (P) wave velocity (Vp), shear (S) wave velocity (Vs) is rarely measured during geophysical surveying, it represents an important tool for reservoir characterization
As an example of this approach, we present possibilities of coherent multiparametric reservoir characterization, where all analyzed parameters related to the potential of hydraulic fracturing are correlated

Summary

Introduction

Comprehensive reservoir characterization requires the use of a wide range of geophysical and petrophysical data; it is often unclear which sets of parameters provide the most important information about a reservoir rock. Elastic properties represent the most fundamental reservoir parameters that can be measured; as such, when combined with petrophysical parameters and other reservoir features, they allow complete characterization of a reservoir rock. By contrast with compressional (P) wave velocity (Vp), shear (S) wave velocity (Vs) is rarely measured during geophysical surveying, it represents an important tool for reservoir characterization. Compressional and shear waves are elastic waves that pass through a medium and cause particle motion in a direction parallel in case of P—wave and perpendicular in case of

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