Browsing by Subject "Mechanical Earth Model"

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Access status: Restricted ,
Analiza geomechanicznych własności dolomitu głównego w oparciu o dane geofizyki wiertniczej oraz badania laboratoryjne na przykładzie struktury Sieraków
(Data obrony: 2017-07-14) Bartolewska, Róża Cecylia
Wydział Geologii, Geofizyki i Ochrony Środowiska
Celem pracy magisterskiej było utworzenie modelu geomechanicznego dolomitu głównego w programie Techlog, w oparciu o zgromadzone dane geofizyki wiertniczej oraz badania laboratoryjne. Tworzenie modeli geomechanicznych umożliwia przewidywanie potencjalnych trudności, które można napotkać w kolejnych etapach rozpoznania i wydobycia węglowodorów ze złóż konwencjonalnych i niekonwencjonalnych. Mechaniczne modele ziemi (Mechanical Earth Models, MEM), stanowią charakterystykę stanu naprężeń w górotworze oraz właściwości mechanicznych skał dla określonego poziomu zbiornikowego i skał znajdujących się w nadkładzie. Obecnie tworzenie modeli geomechanicznych w Polsce jest w początkowej fazie rozwoju.
Access status: Open Access ,
Determination of stress state based on well logging data and laboratory easurements - a CBM well in the southeastern part of the Upper Silesian Coal Basin (Poland)
(Wydawnictwa AGH, 2020) Kępiński, Michał
The main objective of this study is to present calculation methods of horizontal stress profiles, taking into account the stress boundaries model, poro-elastic horizontal strain model and the effective stress ratio approach, using calibration with wellbore failure. The mechanical earth model (MEM) parameters from log measurements and well testing data were estimated for a well located in the southeastern part of the Upper Silesian Coal Basin. Log-derived horizontal stresses of the well are commonly treated as the final product of geomechanical modeling in oil and gas practices. A less popular method for estimating horizontal stresses is based on Kirsch equations juxtaposed with compressional and tensile failure observed on a micro-imager or six-arm caliper. Using this approach, horizontal stresses are determined based on the fact that when hoop stresses exceed the formation’s tensile strength, tensile fractures are created, and when those stresses exceed the compressive strength of the formation, breakouts can be identified. The advantage of this method is that it can be run without in situ stress measurements. The presented workflow is recommended every time there is an image log and dipole sonic measurement in the available dataset, both being necessary to observe the failure zones and MEM.
Access status: Open Access ,
Geomechanical modelling of Paleozoic Shale Gas Formation: a case study from the Baltic Basin, northern Poland
(Wydawnictwa AGH, 2017) Słota-Valim, Małgorzata; Sowiżdżał, Krzysztof; Jędrzejowska-Tyczkowska, Halina
The article presents the importance and position of geomechanical modelling workflow in reservoir characterization studies dedicated to unconventional shale reservoirs. We show the results of 3D geomechanical modelling carried out in an onshore area within the Baltic Basin, northern Poland, where the Silurian and Ordovician shale formations are the exploration targets. The fundamental elements of the methodology, processes, and available datasets used in the modelling are discussed. The petrophysical, elastic, and mechanic properties of the rock were applied in the modelling process, along with the principal stresses and pore pressure in the geological formation. Moreover, the main calculation methods and data requirements for the Mechanical Earth Model construction are discussed. A comprehensive 3D geomechanical model was constructed, providing important information to engineers and decision makers which allows them to optimize well placement, the direction of the horizontal section of the borehole and the parameters of hydraulic fracturing treatment. The model can identify zones of higher potential within the area of interest in terms of efficient stimulation treatment design.