Material Exchange and Migration between Pore Fluids and Sandstones during Diagenetic Processes in Rift Basins: A Case Study Based on Analysis of Diagenetic Products in Dongying Sag, Bohai Bay Basin, East China

Table 1

Modal composition (maximum, minimum, and average) of 1472 samples from the Es sandstones of Dongying Sag.

	Es1			Es2			Es3			Es4			Es
	Minimum (%)	Maximum (%)	Mean (%)	Minimum (%)	Maximum (%)	Mean (%)	Minimum (%)	Maximum (%)	Mean (%)	Minimum (%)	Maximum (%)	Mean (%)	Mean (%)
Detrital composition
Monocrystalline quartz	26.2	59.0	38.5	16.0	61.8	39.4	24.0	69.6	42.5	21.8	43.4	39.5	39.0
Polycrystalline quartz	0.8	1.2	1.0	0.2	1.9	0.9	0.2	3.6	0.7	0.4	0.9	0.6	0.8
K-feldspar	1.7	26.5	10.4	1.0	25.9	10.5	1.0	16.5	7.4	5.8	16.4	7.7	9.0
Plagioclase	1.5	19.2	9.3	1.2	18.5	4.3	1.0	19.8	4.8	4.3	17.4	5.0	6.1
Volcanic lithic fragments	0.4	9.3	2.9	0.2	29.6	3.3	0.2	12.9	1.2	0.4	7.2	3.1	2.6
Metamorphic lithic fragments	1.4	15.0	3.3	0.7	38.5	4.1	0.7	12.5	8.1	2.6	27.7	4.4	5.5
Sedimentary lithic fragments	0.2	3.5	1.7	0.3	23.3	2.2	0.2	23.4	2.2	0.4	3.8	1.6	1.9
Mica	0.1	0.3	0.5	0.4	0.9	0.5	0.3	2.4	0.7	0.0	0.0	0.0	0.4
Charcoal debris	0.2	0.9	0.5	0.3	4.6	1.1	0.3	6.5	1.5	0.4	1.5	0.5	0.9
Clay matrix	0.9	11.9	3.6	0.2	12.8	3.4	0.4	9.6	2.2	0.7	12.6	5.0	3.3
Micritic matrix	0.9	6.9	2.1	0.4	4.5	1.2	0.2	3.3	1.4	0.0	0.0	0.0	1.4
Diagenetic minerals
Calcites	2.8	33.0	5.2	0.2	28.6	3.1	0.2	28.3	1.7	0.5	3.1	1.2	2.8
Dolomites	0.0	0.7	0.4	1.5	18.5	2.2	0.3	22.8	1.6	0.4	7.5	3.4	1.9
Ferrocalcites	0.0	1.8	0.9	0.0	27.5	3.1	0.3	31.3	6.2	0.7	8.4	2.6	3.2
Ankerites	0.0	3.3	1.6	0.0	22.6	3.7	0.4	25.9	4.0	0.5	9.8	6.2	3.9
Authigenic quartz	0.0	0.0	0.0	0.4	1.8	0.8	0.2	3.4	1.1	0.4	3.5	1.0	0.7
pyrites	0.0	2.6	1.8	0.0	5.0	1.3	0.4	4.5	1.3	0.2	6.7	2.5	1.7
Authigenic kaolinites	0.0	0.0	0.0	0.0	3.9	2.7	0.4	9.4	3.2	0.0	1.6	0.3	1.6
Fe-oxide	0.0	0.0	0.0	0.0	1.5	0.2	0.4	5.8	0.7	0.7	4.2	2.6	0.9
Authigenic chlorites	0.0	1.3	0.7	0.0	2.3	0.4	0.0	4.6	1.3	0.6	5.7	3.2	1.4
Authigenic illites	0.0	0.0	0.0	0.0	0.0	0.0	0.0	3.2	1.1	0.1	4.3	2.5	0.9
Siderite	0.0	0.0	0.0	0.4	6.4	1.1	0.0	2.1	0.2	0.0	0.0	0.0	0.3
Porosity
Primary pore	15.0	20.5	13.9	5.4	17.3	7.2	0.0	7.3	0.5	0.0	6.2	0.7	5.6
Feldspars dissolution pores	0.0	2.6	1.2	0.0	7.5	3.6	0.0	5.3	1.8	0.0	4.2	2.0	2.2
Carbonate dissolution pores	0.0	0.0	0.0	0.0	2.1	0.4	0.0	10.5	2.2	0.0	8.9	4.3	1.7
Fractures	0.0	0.9	0.5	0.0	1.2	0.7	0.0	1.3	0.5	0.0	1.7	0.2	0.5