SVIBOR - Project code: 1-09-287

MINISTRY OF SCIENCE AND TECHNOLOGY

Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69
E-mail: ured@znanost.hr

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Project code: 1-09-287


ORGANIC GEOCHEMISTRY IN OIL AND GAS EXPLORATION IN CROATIA


Main researcher: ALAJBEG, ANĐA (202)



Assistants
Type of research: applied
Duration from: 10/10/91. to 02/24/94.

Papers on project (total): 31
Papers on project quoted in Current Contents: 4
Institution name: INA, Razvoj i istraživanje, Zagreb (61)
Department/Institute: INA-RESEARCH AND DEVELOPMENT
Address: SAVSKA 41/X
City: 10000 - Zagreb, Croatia
Communication
Phone: 385 (0)1 216 316
Phone: 385 (0)1 233 16 66/2468
Fax: 385 (0)1 215 273
Phone: 385 (0)1 611 55 11

Summary: Intensive research is undertaken in order to elucidate the age, origin, type, deposition environment, maturity and alteration of oils and the related matter in the sedimentation basins in Croatia. For Drava Depression and Slavonija-Srijem Depression in Croatian Subbasin (Pannonian Basin) the organic matter is found to originate from the Middle Miocene source where algal (or reworked algal) biomass was deposited under suboxsic conditions. The source reached different maturity level in dependence on the burial depth, i.e. temperature. So, it generates light dry gas, oil, condensate, wet gas and heavy dry gas. Oils are found to be predominantly well preserved from alteration in traps. Only few of them underwent biodegradation. Large number of investigated oil seeps and outcrops from Central Dalmatia as well as two oil samples might be discriminated into Triassic, Jurassic and Cretaceous group and their subgroups. As hydrocarbon precursor cyanobacterial biomass is often recognised what goes well with persisting Mesozoic carbonate platform in Adriatic. Deposition environment was marine, often hypersaline and prevailingly anoxic. Organic matter reached relatively low maturity level due to low geothermal gradient in that region. Two oils, explored in Central Adriatic, are found not to be altered but oil seeps were biodegraded in different range up the severe one. A detailed study of the type and quantity of sulphur in the oil-source outcrops of Upper Jurassic strata in Dinarides, was performed. Organic compounds containing sulphur, were paid attention. The data achieved present a modern geochemical base for genetic correlations, for the determination of the maturation rank of the related organic matter as well as for investigation of the deposition environment.

Keywords: ADRIATIC, CROATIAN SUBBASIN (PANNONIAN BASIN), CONDENSATE, DINARIDES, GAS, HYDROCARBONS, OIL, SEDIMENTATION, SOURCE ROCK

Research goals: The main purpose of the research is to learn about the type and distribution of the hydrocarbons in Croatia, especially in order to increase the explored oil and gas traps. Suorce rock in Croatian Subbasin which supplies hydrocarbons into the oil, gas and condensate traps in Drava Depression, i. e. into the oil traps in Slavonija-Srijem Depression is identified. Triassic, Jurassic and two Cretaceous source rocks in Central Dalmatia are indicated. For them the proper burial depth needed to reach the oil window is determined. That provides theindication of the prospectives for further oil and gas exploration in a part of Adriatic and Dinarides. For that sedimentary area the influence of the source maturity from the influence of biodegradation, to hydrocarbon viscosity, has been discriminated. The base for determination of genetic correlations, maturity and deposition environment of Upper Jurassic source-rock from Dinarides is obtained, based on the distribution of sulphur compounds.


COOPERATION - INSTITUTIONS


  1. Name of institution: INA-NAFTAPLIN, Šubićeva 29, Zagreb
    Type of institution: Economical/Production
    Type of cooperation: Occasional exchange of information
    City: 10000 - Zagreb, Croatia

  2. Name of institution: PMF, Zavod za geologiju i paleontologiju, Zvonimirova 8, Zagreb
    Type of institution: University/Faculty
    Type of cooperation: Occasional exchange of information
    City: 10000 - Zagreb, Croatia

  3. Name of institution: CHEVRON-COFRC, Richmond and La Habra, CA. USA
    Type of institution: Economical/Production
    Type of cooperation: Occasional exchange of information
    City: 90631 - Richmond and La Habra, California, USA

  4. Name of institution: CHEVRON-COPI, San Ramon, CA. USA
    Type of institution: Economical/Production
    Type of cooperation: Occasional exchange of information
    City: 94583 - San Ramon, California, USA

  5. Name of institution: STANFORD UNIVERSITY, Stanford, CA. USA
    Type of institution: University/Faculty
    Type of cooperation: Occasional exchange of information
    City: 94305 - Stanford, California, USA

  6. Name of institution: AGIP, San Donato Milanese, Italia
    Type of institution: Economical/Production
    Type of cooperation: Occasional exchange of information
    City: San Donato Milanese, Italija

  7. Name of institution: GEOLOŠKI INSTITUT HRVATSKE, Sachsova 2, Zagreb
    Type of institution: State institute
    Type of cooperation: Occasional exchange of information
    City: 10000 - Zagreb, Croatia

  8. Name of institution: KEMIJSKO-TEHNOLOŠKI FAKULTET, Marulićev trg 19, Zagreb
    Type of institution: University/Faculty
    Type of cooperation: Occasional exchange of information
    City: 10000 - Zagreb, Croatia

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Last update: 10/11/95
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