ROCK EVAL

Es probablemente el parámetro más importante en la etapa de selección. Arroja cuatro parámetros:

1)S1Miligramos de hidrocarburo libre por gramo de roca triturada. Hidrocarburo libre que ya se encuentra en los poros y se evaporó alrededor de los 280°C.

2)S2Miligramos de hidrocarburos pirolizables (inflamable) por gramo de roca triturada. Este se obtiene calentando la roca triturada de 300° a 550°C a incrementos de 25°C/min. Esto descompone el kerógeno y libera más hidrocarburos.

3) Dióxido de carbono ó CO2liberado durante la pirólisis.

4) Tmáx Temperatura al máximo aporte de pirolisato(producto de la pirolisis). Es un indicador de madurez útil donde hay ausencia de vitrinita.

PYROLISYS

Figure 4 Rock-Eval pyrolysis typically produces three major peaks that are used extensively in geochemical characterization of source rocks. The most recent version of the system produces additional data but, for most routine analyses, the peaks of interest are the S1, S2, and S3 peaks as shown here.

Various production parameters can be derived from these peaks plus values for HI and OI indices (see Peters, 1986 for more information).

SLIDE 20

In practice, pyrolysis implies flash exposure of a material to heat in the absence of oxygen. It’s a popular approach, commonly applied in the petrochemical industry to produce, for example, unsaturated hydrocarbon gases. It was first described in 1862 and throughout the 20th century its application grew proportionally in the slipstream of GC and GC/MS. Nowadays, pyrolysis has evolved into a mature sample introduction technique for GC and GC/MS.

After homogenizing the sample, we usually start with an EGA/MS analysis. Therefore, the pyrolyser unit is connected directly to the MS by means of a deactivated capillary restriction. The MS is operated in full scan mode, while the GC oven is set at high temperature thus merely serving as heated transfer line. Upon heating, we usually start from 50 °C to 750 °C at 20 °C/min, volatiles are released and breakdown products formed

SLIDE 21

Geochemical evaluation of NUBIA-B Formation in the Belayim Marine Field Wells: BM-65 & BM-57. (B) Rock-Eval S2 versus depth (C) Rock-Eval Tmax versus depth

SLIDE 22- ROCK EVAL 6-PYROLYSIS

Explico imagen de pirolizador Rock Eval 6 y

SLIDE 23-RESULTS

SLIDE 24

SLIDE 25 MATURITY

NUBIA-B Formation Source rock assessment, the Belayim Marine Field Wells: BM-65 & BM-57. (D) Maturation and nature of the hydrocarbon products according to the Tmax versus production index (PI) plot of

[25].

SLIDE 26- VITRINITE REFLECTANCE

SLIDE 27 EXPLICAR IMÁGENES

SLIDE 28 CORRELATION

Explico imagen con aspectos cualitativos y cuantitativos

SLIDE 29 CORRELATION COEEFICIENT

Explico imagen de dos crudos A y B (Fig. 6)

SLIDE 30