Oil and gas bearingness and structural elements of Adriatic islands and peninsulas (Outer Dinarides) with special review of anhydrite - carbonate Mesozoic complex and diapiric belt

摘要

Evaporite deposits of Mesozoic age in the area of Adriatic islands and peninsulas (Outer Dinarides) have been attracting attention of exploration geologists for many years. This paper presents petroleum geological data that provide more certainty for more accurate planning of exploration operations that would result in location of new, very deep exploration wells in certain parts of Adriatic islands and peninsulas (Figures 1,2, 3,4 and 5). This is the area of anhydrite-carbonate complex, especially in the part of Mesozoic basin where certain hydrocarbon shows of C_1C_5 were acquired in Brac-1 B well and where the pressure of 1100 bar (15 954 psi) was measured. This confirms the previous knowledge that deposits with anhydrite seal represent closed petroleum geological units with high pressure and temperature and commercially significant hydrocarbon quantities. The opinion is presented on hydrogen sulfide shows in anhydrite-carbonate complex and its bad impact on human health and on destructive alteration of crystal lattice in steel. The paper also presents diapirs on the southern edge of Mesozoic basin in the area of southern islands, their impact on formation of certain islands and possible impact on oil and gas bearing relations within this basin (Figure 5).%Već dugi niz godina evaporitne naslage mezozojske starosti na području jadranskih otoka i poluotokarn(vanjski Dinaridi) zaokupljaju pažnju geologa istraživača. Ovim radom su prikazani naftno-geološki podaci,rnkoji omogućuju veću sigurnost kako bi se moglo točnije nego dosad planirati istraživačke radove u ciljurnlociranja novih, vrlo dubokih istraživačkih bušotina na pojedinim dijelovima jadranskih otoka i poluotokarn(slike 1,2,3,4 i 5).rnTo je područje anhidritno-karbonatnog kompleksa, a naročito u području južnootočkog mezozojskog bazena,rngdje su bušotinom Brač-IB određene pojave ugljikovodika od C_1-C_5, te izmjeren tlak od 1100 bara. Time sernpotvrđuju ranija saznanja, da naslage s anhidritnim pokrivačem (izolator) predstavljaju zatvorenernnaftno-geološke cjeline s visokim tlakom i temperaturom, te ekonomski značajnim količinamarnugljikovodika.rnDano je mišljenje o pojavama sumporovodika u anhidritno-karbonatnom kompleksu i njegovom lošemrndjelovanju na ljudski organizam, a također i na razornu izmjenu kristalne rešetke u čeliku.rnPrikazani su i dijapiri na južnom rubu južnootočkog mezozojskog bazena, njihov utjecaj na formiranjernpojedinih otoka i mogući utjecaj na nafto-plinonosne odnose u tom bazenu (slika 5).