Determination of Formation Time of Calcareous Cements in Marine Sandstone and Their Influence on Hydrocarbon Accumulation: A Case Study of the Carboniferous Donghe Sandstone in the Hadexun Oilfield, Tarim Basin

Table 1

Mineral components in calcareous interlayers within the Donghe sandstone, Hadexun Oilfield, based on XDR whole-rock analysis.

Well no.	Depth/m	Lithology	Type and content (%) of minerals					Total content of clay minerals (%)
			Quartz	K-feldspar	Calcite	Pyrite	Dolomite
HD4	5070.07	Sandstone	68.0	1.9	26.9	—	—	3.2
HD4	5070.62	Sandstone	54.9	1.4	39.9	—	—	3.8
HD4	5098.52	Sandstone	20.9	2.8	73.5	—	—	2.8
HD17	5529.01	Sandstone	4.4	0.8	94.8	—	—	—
HD17	5529.47	Sandstone	42.6	1.8	52.8	—	—	2.8
HD17	5230.13	Sandstone	54.0	1.9	36.2	0.9	5.4	1.6