Method for evaluation of hydrocarbon content of shale

[0128]FIG. 4 shows a plot for a ConocoPhillips field location which will be referred to as field location A. This plot shows measured and computed logs which are detailed further in Table 2 below. The solid computed lines were obtained using a RHOB-DT model according to the first, third and fourth embodiments; the dashed lines were obtained using a RHOB-NPHI model according to the second, third and fourth embodiments. Where there is more than one label, the upper label for each track is the name of data from core samples, which are shown as open circles on the respective track. The middle and lower labels represent data from the RHOB-DT and RHOB-NPHI models, respectively. For each track the scale is indicated at the top; this scale is reproduced in Table 3 since it can be hard to read in the Figure.

[0129]FIG. 4 shows the excellent correlation between the derived results with core data, shown as open circles on the plot. FIGS. 5 and 6, relating to Examples 2 and 3 below, also show go...

[0130]FIG. 5 shows a plot for a ConocoPhillips field location which will be referred to as field location B. This plot shows measured and computed logs whose details are given in Table 3 above The solid computed lines were obtained using a RHOB-DT model according to the first, third and fourth embodiments; the dashed lines were obtained using a RHOB-NPHI model according to the second, third and fourth embodiments.

[0131]FIG. 5 shows a plot for a ConocoPhillips field location which will be referred to as field location C. This plot shows measured and computed logs whose details are given in Table 3 above. The solid computed lines were obtained using a RHOB-DT model according to the first, third and fourth embodiments; the dashed lines were obtained using a RHOB-NPHI model according to the second, third and fourth embodiments.

EXAMPLE b 4

[0132]FIG. 10 shows a plot for a ConocoPhillips field location which will be referred to as field location D. This plot shows measured and computed logs similar to those of the previous examples. The computed lines were obtained using a methodology according to the fifth embodiment.