Izračun 1D variograma unutar pješčenjačkih ležišta i njihove krovine polja Šandrovac

master's thesis

• Title: Izračun 1D variograma unutar pješčenjačkih ležišta i njihove krovine polja Šandrovac : diplomski rad
• Title (english): Calculation of 1D variogram within sandstone reservoirs and their top in the Šandrovac field : master’s thesis
• Author: Marko Vekić
• Mentor: Tomislav Malvić (mentor)
• Committee member: Josipa Velić (predsjednik povjerenstva)
• Committee member: Tomislav Malvić (član povjerenstva)
• Committee member: Zdenko Krištafor (član povjerenstva)
• Granter: University of Zagreb; Faculty of Mining, Geology and Petroleum Engineering; (Department of Petroleum and Gas Engineering and energy); Zagreb
• Defense date and country: 2016-09-19, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mining, Petroleum and Geology Engineering; Petroleum Mining

Abstract

Polje Šandrovac smješteno je u sjevernom dijelu Bjelovarske subdepresije. Ležišta u polju su
litološki heterogena te sadrže znatnu količinu CO2 u otopljenom i prirodnom plinu. Geostatistički
alat korišten u ovom radu zove se variogram. Variogramom se određuje koje su vrijednosti skupa
podataka na određenoj udaljenosti još uvijek u zavisnosti. Variogrami u ovom radu su izrađeni u
računalnom programu Variowin, a postupak izrade, kao i parametri variograma opisani su u
poglavlju 4. U tom poglavlju dan je opis variograma, opis njegovih parametara kao i variogramski
modeli koji se koriste u geostatistici. Nadalje, dane su detaljne upute izrade variograma u
računalnom programu Variowin koje su popraćene slikama. U poglavlju 5 prikazani su podatci
korišteni u izradi variograma, izrađeni variogrami te aproksimacija variograma matematičkim
modelom. Korišteni su pravi podatci za ležište te „umjetni“ podatci za krovinu. Na temelju tih
podataka prvo su načinjeni histogrami šupljikavosti ležišta i krovine. Nakon toga je izračunata
varijanca, srednja vrijednost te vrijednosti minimalne i maksimalne šupljikavosti. Nadalje,
načinjeni su variogrami te aproksimacija variograma teorijskim modelom. Zaključeno je da se
variogrami dobiveni na temelju podataka iz tablice 5-1 ne mogu aproksimirati niti jednim od
mogućih teorijskih modela, stoga je takav slijed događaja (taloženja) prikazan grafički slikama 5-
12, 5-13, 5-14 i 5-15. Variogrami dobiveni na temelju podataka iz tablice 5-2 aproksimirani su
eksponencijalnim modelom.

Abstract (english)

Abstract: The Šandrovac Field is located in the northern part of the Bjelovar Sag (subdepression). Reservoirs in the Šandrovac field are lithologically heterogeneous, containing a considerable amount of CO2, both in solution gas and natural gas. Geostatistical tool used in this thesis is called the variogram. The variogram determines which values of data series on a certain distance are still in correlation. Variograms in this thesis were made using the Variowin computer program. The creation procedure and the parameters of the variogram were described in Chapter 4. In that chapter, the description of the variogram, as well as the description of its parameters and variogram models, used in geostatistics, were given. Furthermore, detailed instructions on the making of variograms using the Variogram computer program accompanied by figures were shown. The data used in the making of variograms, the completed variograms and the approximation of variograms by mathematical models, were shown in Chapter 5. Real data for reservoir and “artificial” data for top were used. Based on that data, first to be made were the porosity histograms of the reservoir and the top. After that, the variance, median as well as minimal and maximal porosity values were calculated. Furthermore, variograms and the approximation of variograms by theoretical models were made. It was concluded that variograms made from data in Chart 5-1 could not be approximated by any theoretical model. Because of that, such sequence (sedimentation) was shown graphically in figures 5-12, 5-13, 5-14 and 5-15. Variograms, which were made from data in Chart 5-2, were approximated by the exponential model.

• Keywords: polje Šandrovac; geostatistika; variogram; Variowin; varijanca; teorijski modeli
• Keywords (english): Šandrovac field; geostatistics; variogram; Variowin; variance; theoretical models
• Language: croatian
• URN:NBN: urn:nbn:hr:169:307703
• Study programme: Title: Petroleum engineering; specializations in: Petroleum engineering, Energy production and supply, Environmental protection in petroleum engineering; Course: Petroleum engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka naftnog rudarstva (magistar/magistra inženjer/inženjerka naftnog rudarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2016-09-23 13:01:07