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

Table 1

Thin-section compositions from optical point counting and quantitative image analysis.

Well	Strata	No.	Grain size (mm), %					No.	Quartz, %	K-feldspar, %	Plagioclase, %	Rock fragment, %
			0.031–0.063	0.063–0.125	0.125–0.25	0.25–0.50
F1	Es4	3	14.2	60.9	24.9	0	1.6	6	40.7	14.4	18.2	26.7
F25	Es3	2	0	10.1	52.2	37.7	1.5	2	43.5	16.0	20.0	20.5
F104	Es3	2	0.5	35.85	58.7	4.95	1.6	17	39.4	15.7	19.3	25.7
G351	Es4	2	6.7	60.95	31.15	1.2	1.5	16	48.3	16.5	17.5	17.7
G891	Es4	1	12.1	63.3	24.3	0.3	1.6	2	46.4	17.9	19.8	15.9
G893	Es4	2	18.8	68.3	12.9	0	1.5	7	45.9	17.7	19.6	15.8
			7.5	49.9	34.0	7.4		AVG.	44.1	16.4	19.1	20.4

Sorting coefficient , , and are the grain sizes at 25% and 75%, respectively.