oil-gas-2019-scientifictracks

Page 24

Volume 3

Journal of Environmental Chemistry and Toxicology

oil and gas

August 05-06, 2019 | Singapore

International Conference on

Oil Gas 2019

August 05-06, 2019

J Environ Chem Toxicol, Volume 3

Shale oil and shale gas potentialities of Barremian-Albian source rocks inNorthernTunisia

Rachida Talbi

CERTE, Tunisia

he Lower Cretaceous is a major petroleum source rock of the North, Northwest, and Northeast of Tunisia. These source

rocks are spread over the paleogeographic area of the country which corresponded to the deep-sea paleogeographic domain

"the Tunisian furrow" constituting the Northeast end of the southern margin of the Tethys (Fig1). The Hawk pyrolysis results

with the geological and mineralogical data make it possible to define three types of unconventional source rock systems related

to this domain. These mainly argilo-carbonated and marine-type II organic source rocks can be qualified as three types of

unconventional system resources: Low thermal maturity shale oil hybrid system with a combination of juxtaposed organic-

rich and organic-lean facies associated with open fractures, combination gas/oil hybrid system, and shale gas hybrid mudstone

system. The first system is associated with very high organic matter richness. The transformation ratio recorded in this system

ranges from 40 to 50%, hence the hydrocarbon generating potential (HGP) ranges from 50 to 60%. A fraction of this HGP,

stored in the rock, is of free hydrocarbons associated with numerous faults creating tow "oil crossover" effects that indicate oil-

saturated source rock levels. In the other two systems, the organic matter richness is greatly reduced by the high to a very high

degree of maturity (corresponding to the dry gas window in the NW and the combination of oil and/or wet gas window for the

NE). Retained hydrocarbons yet stored in shales can potentially be extracted via hydraulic fracturing. They are conserved as a

dry gas (methane) in the NW basin and as oil and wet gas in the North and NE basins. The storage capacities in those basins

are calculated using organic porosity as a result of the transformation and expulsion of hydrocarbons from the source rocks.

Biography

Rachida Talbi has her expertise in organic geochemistry applied to petroleum source rocks. Her in-depth knowledge of the basic

disciplines of geology, in particular, geochemistry, sedimentology, biostratigraphy, and tectonics, allows her to carry out synthesis work

on the genesis, migration and possible trapping of hydrocarbons on the geologic basin scale, both in the field of conventional and

unconventional oil research. She has built this know-how after years of experience in academic research, teaching and supervision,

as well as in the follow-up of research projects. The compilation of organic geochemistry data with observations and geological field

studies explains many phenomena that organic geochemistry alone does not elucidate. After trying to work in the field of organic

geochemistry of recent environments, she started research on biogenic methane produced in paralic areas (laguna and sebkha) as a

future source of energy.