Fracture, Dissolution, and Cementation Events in Ordovician Carbonate Reservoirs, Tarim Basin, NW China

Table 1

Summary of petrographic characteristics of the main diagenetic features and cements shown in chronological order (paragenetic sequence). KB: matrix karstic breccia; F: fracture; V: dissolution vug; S: stylolite; Cc: calcite cement; Cs: calcite sediment; Dc: dolomite cement.

Feature	Cement	Formation	Morphology	Crystal size	CL	SEM-CL
Host rock	−	Yingshan	micrite	< 4 mm	Orange to dull red	Light-luminescent; slightly zoned
		Yijianfang	micrite
		Tumuxiuke	micrite
		Lianglitage	micrite
Host rock cementation	Cc0a	Yingshan; Yijianfang; Tumuxiuke; Lianglitage	rim	< 10 mm	Dull red	Light-luminescent; slightly zoned
	Cc0b	Yingshan; Yijianfang; Tumuxiuke; Lianglitage	drusy	50 to 250 mm	Dull red	Dark- to light luminescent; zoned
	Cc0c	Yingshan; Yijianfang; Tumuxiuke; Lianglitage	syntaxial	250 mm to 1 mm	Non-luminescent to bright orange zoned	Light-luminescent; slightly zoned
Dark mottles	Cs0a	Yingshan; Yijianfang; Tumuxiuke;	silt	< 20 mm	Orange to dull red	Light-luminescent; slightly zoned
	Cs0b	Top Yijianfang; Tumuxiuke	mud	< 4 mm	Orange to dull red	Light-luminescent; slightly zoned
F1	Cc1	Yijianfang; Tumuxiuke;	pallisade	300 mm - 1 mm	Non-luminescent to bright orange zoned	Light-luminescent; slightly zoned
	Cs1	Yijianfang; Tumuxiuke;	silt	10-75 mm	Non-luminescent	−
Karstic breccias	KB	Lianglitage	silt	250 mm to 2 mm	−	−
V2	Cc2	Yingshan; Yijianfang; Tumuxiuke; Lianglitage	blocky	50 - 250 mm	Non-luminescent to bright orange zoned	Dark- to light luminescent; zoned
F2a
F2b
S1a & S1b	−	Yingshan; Yijianfang; Tumuxiuke; Lianglitage	−	−	−	−
F3a	Cc3a	Yingshan; Yijianfang; Tumuxiuke; Lianglitage	rim	50 - 200 mm	Dark red to bright orange luminescent	Dark- to light-luminescent; zoned
F3b
F3c	Bitumen	−	−	−	−	−
V3	Cc3b	Lianglitage	blocky	500 mm - 2 mm	Orange luminescent	Light-luminescent; unzoned
F4a	Cc4	Yijianfang; Tumuxiuke	blocky	50 mm - 1 mm	Red luminescent	Dark-luminescent; unzoned
F4b
V4
F5	Fluorite	Yijianfang	euhedral	up to 5 cm	−	−
	Barite	Yijianfang	euhedral	up to 4 mm	−	−
	Cc5	Yijianfang	blocky	200 - 250 mm	Red to dull red luminescent	Light-luminescent; slightly zoned
	Recrystallized host rock	Yingshan; Yijianfang	crystalline	< 4 to 50 mm	Red to dull red luminescent	Light-luminescent; slightly zoned
F6	Cc6	Yingshan; Yijianfang	blocky	200 - 600 mm	Dull red to non-luminescent	Light luminescent; unzoned
V6
F7a	Cc7a	Yingshan; Yijianfang; Tumuxiuke; Lianglitage	bridges	50 - 100 mm	−	Light-luminescent; unzoned
F7b	Cc7b	Yingshan; Yijianfang; Tumuxiuke; Lianglitage	blocky	50 mm - 1 mm	−	Light-luminescent; unzoned
V7
F7c & S2	Dc1	Yingshan; Yijianfang; Tumuxiuke; Lianglitage	euhedral	< 30 mm	−	Dark-luminescent