INDEX hydrogen

Accurate interpretation of the formation properties (porosity, permeability and irreducible water saturation) requires reliable estimates of NMR fluid properties or the relationship between diffusivity and relaxation time. Estimation of oil viscosity and solution-gas content require their correlation with NMR measurable fluid properties. These include the hydrogen index, bulk fluid relaxation time and bulk fluid diffusivity [8]. 

Porosity (ej>) determination with NMR is a direct measurement as the response is from the fluid(s) in the pore space of the rock. The initial amplitude (before relaxation) of the NMR response of the fluid(s) saturated rock (corrected for hydrogen index) is compared with the amplitude of the response of bulk water having the same volume as the bulk volume of the rock sample. The 2 MHz NMR... 

Air Liquide, MEDAL Hydrogen Membrane, available at http //www.medal.airliquide.com/en/ membranes/hydrogen/index.asp (accessed July 2007). 

Figure 3. Partial FID chromatograms (/z-Cg to n-C9 region) from flash pyrolysis of Monterey Fm. kerogens, Santa Barbara basin. Open and closed circles indicate w-alk-l-enes and /z-alkanes respectively. Depth of burial, Rock-Eval pyrolysis Tmax, Hydrogen Index (HI), and the thiophene ration (TR) are shown.

Figure 10. FPD chromatograms from flash pyrolysis of Mahakam coals. Sample depth, vitrinite reflectance, Rock-Eval Tmax, hydrogen index (HI) and the thiophene ratio (TR) are shown. Peak identifications are given in Table V.

Hartman-Stroup C. (1987) The effect of organic matter type and organic content on Rock-Eval hydrogen index in oil shales and source rocks. Org. Geochem. 11, 351-369. 

Present-day reservoir or source rock temperature. 1 ppm — 1 pg g of rock. Hydrogen index HI — mg hydrocarbons produced per gram of TOC by ROCK EVAL pyrolysis of pre-extracted rock powder. ROCK EVAL parameter. Vitrinite reflectance. 

Hydrogen index Petroleum generated Expulsion efficiency... 

Well logging Electrical surveys resistivity conductivity shale formation factor salinity variations Interval transit time Bulk density Hydrogen index Thermal neutron capture cross section Nuclear magnetic resonance Downhole gravity data After drilling... 

Figure 9. Evolution of hydrogen index vs. Tmax of Rock-Evalpyrolysis in natural Series I, II, and III (hatched) and in heated samples (identified by final temperature of pyrolysis). Key , Green River shales (GRS) a, Toarcian shales (To) and, humic...

The organic hydrogen richness of the oil shales was assessed from Rock Eval pyrolysis data (Hydrogen index) which at high levels of organic richness can be considered to give reliable data (14, 15). 

Figure 1. Hydrogen index vs. oxygen index for various oil shales.

Huang W.-L. (1996) Experimental study of vitrinite maturation effects of temperature, time, pressure, water, and hydrogen index. Org. Geochem. 24, 233—41. 

Hydrogen Index (HI) values from Rock-Eval pyrolysis (see Sect. 4.5.2) below about 150 mg HC/g TOC are typical of terrigenous organic matter, whereas HI values... 

Veto, I., Hetenyi, M., Demeny, A. and Hertelendi, E., 1994. Hydrogen index as reflecting intensity of sulphide diagenesis in non-bioturbated, shaly sediments. Org. Geochem., 22 299-310. 

Likewise Isaksen et al. (1998) suggested that there is too low a concentration of Cg+ precursors in the Middle Jurassic Hugin coals in the North Sea to cause expulsion of non-volatile black oils, and they also suggested that neither the hydrogen index (HI) nor the resinite content correctly reflect the ability of a given coal to expel black oil. 

The value of the source rock s hydrogen index HI) at initial or original conditions is estimated from values of the current hydrogen index using... 

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