Diagenetic Fluid and Its Impact on Sandstone Reservoirs in the Southern Boxing Sag, Dongying Depression, Bohai Bay Basin, China

Table 3

Mineralogical and isotopic composition of carbonate. Ca: calcite; Fc: Fe-calcite; An: ankerite.

Well	Lithology	Depth	Strata	Carbonate content	Minerals	(‰)	(‰)
F1	Sandstone	3321.5	Es4	14.2%	70%An+30%Ca	-11.3	-0.8
F1	Sandstone	3319.1	Es4	13.6%	100%An	-9.6	-0.5
F1	Sandstone	3314.6	Es4	7.4%	80%An+20%Ca	-11.7	-1.1
F1	Sandstone	3312.3	Es4	8.9%	80%An+20%Ca	-11.4	-1.2
F1	Sandstone	3310.3	Es4	3.4%	100%An	-10	-0.8
F1	Sandstone	3311.3	Es4	3.7%	100%An	-10.3	-1
G893	Sandstone	3210.2	Es4	—	95%An+5%Ca	-8.4	-0.3
G893	Sandstone	3281.0	Es4	25.1%	90%An+10%Ca	-9.3	-1.7
F31	Sandstone	2934.0	Es3	4.6%	100%An	-12.1	3
F25	Sandstone	2901.5	Es3	10.2%	90%Fc+10%Ca	-12.8	3.3
F25	Sandstone	2998.5	Es3	2.8%	90%Fc+10%Ca	-13.8	1.6
F104	Sandstone	3038.9	Es3	16.2%	95%An+5%Fc	-13.4	3.3
F104	Sandstone	3039.2	Es3	14.1%	95%An+5%Fc	-9.5	2.9