Jednodimenzionalno seizmičko modeliranje i primjena seizmičkih istraživanja u naftnom rudarstvu

master's thesis

• Title: Jednodimenzionalno seizmičko modeliranje i primjena seizmičkih istraživanja u naftnom rudarstvu : diplomski rad
• Title (english): Calculation of synthetic seismograms and application of seismic methods in petroleum engineering : master's thesis
• Author: Martina Perutina
• Mentor: Jasna Orešković (mentor)
• Committee member: Jasna Orešković (predsjednik povjerenstva)
• Committee member: Franjo Šumanovac (član povjerenstva)
• Committee member: Vladislav Brkić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Mining, Geology and Petroleum Engineering; (Department of Geophysical Exploration and Mine Surveying); Zagreb
• Defense date and country: 2020-02-14, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mining, Petroleum and Geology Engineering; Petroleum Mining

Abstract

Sintetski seizmogram predstavlja izračunati seizmički trag prema modelu određenog dijela podzemlja. On može biti trodimenzionalan, dvodimenzionalan, te jednodimenzionalan. Glavna pretpostavka pri izračunu sintetskog seizmograma jest da se geološki model podzemlja sastoji od slojeva različitog litološkog sastava, a time i različitih fizikalnih svojstava. Kao ulazni podaci za izračun sintetskog seizmograma koriste se podaci gustoće slojeva koje su dobivene karotažom gustoće te brzine širenja zvučnih valova kroz slojeve koje su dobivene iz zvučne karotaže. Umnoškom tih ulaznih vrijednosti dobiva se akustična impedancija iz koje proizlaze koeficijenti refleksije. Također, za potrebe proračuna podešava se frekvencija i polaritet ulaznog valića koji ostaje nepromijenjen tijekom širenja kroz slojeve. Konvolucijom valića s koeficijentima refleksije dobiva se sintetski seizmogram koji primarno služi za povezivanje bušotinskih podataka sa seizmičkim horizontima. U ovom je radu izračunati su jednodimenzionalni sintetski seizmogrami na primjerima polja u Jadranu (plinsko polje Katarina) i u Savskoj depresiji (naftno-plinsko polje Stružec). Proračun je rađen u računalnom programu Petrel. Ustanovljeno je da korištenje determinističkog valića u oba slučaja pruža preciznija rješenja od analitičkog valića. Usporedbom sintetskog seizmograma i bušotinskih podataka litološke granice su povezane s refleksima te je napravljeno praćenje horizonta PLQ-A plinskog polja Katarina te horizonta p1 naftno-plinskog polja Stružec. Također opisani su direktni indikatori ugljikovodika uz sistematizirana pojašnjenja koja olakšavaju interpretaciju ležišta u vidu određivanja ležišnih svojstava.

Abstract (english)

Synthetic seismogram presents calculated seismic response for a particular underground model. It can be three-, two-, or one-dimensional. The main premise during the calculation of a synthetic seismogram is that geological model is composed of layers of different mineral composition, and therefore, different physical properties. Density logs along with acoustic logs are used as input data for synthetic generation. Multiplying layer's densities with the sonic velocities produces acoustic impedance, and reflection coefficients are calculated. During the calculation of synthetic seismograms, frequency, polarity and phase of the wavelet are altered to see the impact on synthetics. Convolving the wavelet with reflection coefficients, synthetic seismogram is obtained, which is primarily used for tying the well data to seismic horizons (Well Tie). In this thesis, 1-D synthetic is calculated in two wells for the gas field Katarina and two wells on the oil-gas field Stružec. The synthetic seismogram generation was performed using the Petrel software. It was determined that the use of deterministic wavelet provides more accurate results when compared to analytical wavelet. The correlation of the synthetic seismogram and well tops provided identification of events on seismic data. The tracking of two seismic horizons has been made: PLQ-A at the field Katarina and p1 at the field Stružec. Also, direct hydrocarbon indicators are described with systematized explanations which make reservoir identification and evaluation, in terms of reservoir properties, much easier.

• Keywords: sintetski seizmogram; koeficijent refleksije; valić; Petrel; direktni indikatori ugljikovodika
• Keywords (english): synthetic seismogram; reflection coefficient; wavelet; convolution; acoustic impedance; direct hydrocarbon indicator; hydrocarbon reservoir evaluation
• Language: croatian
• URN:NBN: urn:nbn:hr:169:934212
• 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: 2020-03-05 13:52:25