Development and Validation of a Novel Interpretation Algorithm for Enhanced Resolution of Well Logging Signals

Table 3

Comparison between the weighted average mineralogical composition (WAC) and the average composition determined from the spectroscopic mineralogy log for the 2 solutions determined by the algorithm. 70%: solution with 70% probability; 30%: solution with 30% probability. Mineral compositions expressed as % of the formation weight; EF: electrofacies, in ohm·m.

(a)

70%	Illite	Kaolinite	Organic	Siderite	Quartz	EF
Shale 1	50.0	10.0	2.3	4.0	33.7	<140
Silt	26.6	10.5	0.4	2.4	60.2	<140<180
Shale 2	35.0	10.0	1.5	24.3	29.2	180<
WAC	37.1	10.2	1.3	6.8	44.6
Log	37.3	10.3	1.2	7.0	44.2

(b)

30%	Illite	Kaolinite	Organic	Siderite	Quartz	EF
Silt	25.0	10.5	0.1	2.0	62.3	<140
Shale 1	48.7	10.0	2.4	4.0	34.8	<140<180
Shale 2	35.0	10.0	1.2	24.7	29.1	180<
WAC	37.1	10.2	1.3	6.8	44.6
Log	37.3	10.3	1.2	7.0	44.2