Developing a GIS-based rough fuzzy set granulation model to handle spatial uncertainty for hydrocarbon structure classification, case study: Fars domain, Iran

Figures & data

Figure 1. The phases of the proposed RFSG model.

Figure 2. The study area.

Figure 3. Chronostratigraphic chart of Fars province.

Table 1. Classification for the quantity of the condition attributes.

Range of chance for presence of factors (%)	Class
(0–25)	1
(25–50)	2
(50–75)	3
(75–100)	4

Figure 4. Location of structures in .Table 2

Table 2. The first five rows in the weighted and ranked information table for the hydrocarbon system parameters.

Structure	Trap	Reservoir	Source	Seal	Porosity	Retention	Extraction
Asan	0.9	0.99	0.85	0.8	0.9	0.7	0.8
Banzarak	0.2	0.8	0.5	0.6	0.6	0.8	0.8
Pazard	0.15	0.95	0.4	0.6	0.7	0.5	0.4
Tarpoo	0.4	1	.85	0.8	0.9	0.7	0.7
Tudruyeh	0.8	1	.65	0.9	0.8	0.6	0.5
Structure	trap	Reservoir	Source	Seal	Porosity	Retention	Extraction
Asan	4	4	4	4	4	3	4
Banzarak	1	4	2	3	3	4	4
Pazard	1	4	2	3	3	2	2
Tarpoo	2	4	4	4	4	3	3
Tudruyeh	4	4	3	4	4	3	2

Figure 5. Spatial autocorrelation report and its results.

Figure 6. Thiessen polygons for calculating the fuzzy membership function.

Table 3. List of the qualified rules.

Rule No.	Hydrocarbon parameters as condition attributes					Fuzzy decision attributes		Evaluation Indices
	Trap	Reservoir	Source	Retention	Extraction	BGC	GGC	Generality	Abs. Support
1	1					0.72	0.28	0.75	0.75
2			2			0.69	0.31	0.75	0.75
3			3		3	0.55	0.45	0.75	0.75
4		2				0.7	0.3	1	0.75
5					2	0.68	0.32	1	1
6	2		4	4		0.4	0.6	0.75	0.75
7			3	3		0.47	0.53	1	1
8	2		4		4	0.36	0.64	0.75	1
9	4				4	0.18	0.82	1	1
10	3	4	3		4	0.34	0.66	1	1
11	3		4	4		0.28	0.72	1	1

Figure 7. (a) Fuzzy entropy of the results. (b) Fuzzy cross-entropy of the results.

Figure 8. Structures granulation of the hydrocarbon structures, according to lower and upper approximation of BGC and GGC.

Data availability statement

The data that support the findings of this study are available from the corresponding author, upon reasonable request (https://www.researchgate.net/profile/Sahand-Seraj-2).