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Assessment methods of compression waves velocity Vp to shear waves Vs ratio relation with Sw saturation coefficient for rotliegend sandstone formations
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Abstrakty
W ramach pracy wykonano kompleksowe badania laboratoryjne rdzeni wiertniczych: porozymetryczne, przepuszczalności, mineralogiczne, spektrometryczne, metodą NMR i elektrycznych parametrów skał, ale przede wszystkim propagacji fal ultradźwiękowych. Pomiary prędkości rozchodzenia się fali podłużnej Vp i poprzecznej Vs przeprowadzono na próbkach skał o różnym współczynniku nasycenia Sw (0-100%). Próbki pogrupowano w klasy o podobnej porowatości zmieniającej się w przedziale 0-15%. Badania zależności pomiędzy zmianą nasycenia a prędkością fal przeprowadzono zarówno metodą saturacji jak i desaturacji próbek w 100% nasyconych solanką. Uzyskane dane umożliwiły określenie parametrów sprężystych i ich związków korelacyjnych z innymi właściwościami zbiornikowymi piaskowców formacji czerwonego spągowca analizowanego rejonu. W wyniku prac doświadczalnych i modelowych wyznaczono współczynniki niezbędne do rozwiązania równania Gassmanna i podjęto próbę rozwiązania i weryfikacji tego równania, z wynikiem pozytywnym. Równocześnie wykonano kompleksową interpretację profilowań geofizycznych. Otrzymane krzywe wynikowe zostały wykorzystane jako dane wejściowe do analizy fluid substitution. Wygenerowano sejsmogramy syntetyczne dla modelowych nasyceń gazem, ropą i solanką oraz skonstruowano wykresy krzyżowe przedstawiające zmiany amplitud refleksów w funkcji offsetu w celu określenia wpływu nasycenia piaskowców czerwonego spągowca na rejestrowany obraz sejsmiczny. Na podstawie przeprowadzonych prac podjęto próbę odpowiedzi na pytanie, dlaczego właściwości zbiornikowe utworów czerwonego spągowca rejonu Parzęczewo - Czarna Wieś tak znacząco różnią się od tożsamych wiekowo osadów sąsiedniego rejonu Cicha Góra.
The study involved carrying out of complex laboratory testing of core plugs: porosimetry, permeability, mineralogy, spectrometry, NMR method and electrical parameters of rocks, and most of all ultrasonic waves propagation. Measurements of compression wave Vp and shear wave Vs propagation velocities were performed on rock samples having various Sw saturation coefficient (0-100%). The samples were grouped into classes having similar porosity, varying in range 0-15%. Testing of saturation change and velocity of waves relationship were carried out both using saturation and desaturation methods for samples saturated to 100% with brine. Obtained data allowed for determination of elastic parameters and their correlation relationships with other reservoir parameters of Rotliegend sandstones from analysed region. In effect of experimental and model works, coefficients necessary to solve Gassmann equation have been determined, as well as attempt of solving and verification of the equation has been made with positive result. Simultaneously complex interpretation of well log data was performed. Obtained resultant curves have been used in capacity of input data for fluid substitution analysis. Synthetic seismograms for model gas, oil and brine saturation have been generated, as well as cross plots presenting changes of reflexes amplitude changes versus offset, in order to determine influence of Rotliegend sandstones saturation on recorded seismic image. Based on the completed works an attempt to respond the question, why reservoir parameters of Rotliegend formations in Parzęczewo - Czarna Wieś region such significantly differ from identical as to age deposits of neighbouring Cicha Góra region, has also been made.
Czasopismo
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Tom
Strony
1--105
Opis fizyczny
Bibliogr. 81 poz., rys., tab., wykr.
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autor
autor
autor
autor
autor
- Instytut Nafty i Gazu
Bibliografia
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Bibliografia
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bwmeta1.element.baztech-article-AGHM-0034-0009