Laser ablation in situ U-Pb dating and its application to diagenesis-porosity evolution of carbonate reservoirs
SHEN Anjiang,HU Anping,CHENG Ting,LIANG Feng,PAN Wenqing,FENG Yuexing,ZHAO Jianxin
Table 1 Information on the source, horizon, occurrence and purpose of the dating samples.
Sample number Profile/Well name Layer Depth/m Sample occurrence Test purpose
XF-Z2dn2-S4 Xianfeng (XF) Deng 2 Member Algal lamina or algal stromatolith dolomite
(surrounding rock)
Stratum age or dolomitization time
GC-Z2dn2-B3 Gucheng (GC) Deng 2 Member
XF-Z2dn2-S5 Xianfeng (XF) Deng 2 Member Concentric ring-edge dolomite cement
(dark lace)
Formation time and filling time and
periods of vugs
YB-Z2dn2-B2 Yangba (YB) Deng 2 Member
GC-Z2dn2-B5 Gucheng (GC) Deng 2 Member
XF-Z2dn2-S4 Xianfeng (XF) Deng 2 Member Radial dolomite cement (light lace)
GC-Z2dn2-B4 Gucheng (GC) Deng 2 Member
XF-Z2dn2-S4 Xianfeng (XF) Deng 2 Member Layered light grey-dark dolomite cement
YB-Z2dn2-B2 Yangba (YB) Deng 2 Member
GC-Z2dn2-B5 Gucheng Deng 2 Member Late medium-coarse crystalline dolomite cement filling vugs
XF-Z2dn1-B2 Xianfeng (XF) Deng 2 Member Latest coarse crystalline dolomite
cement filling vugs
GC-Z2dn2-B3 Gucheng (GC) Deng 2 Member
GS6-Z2d2-1 GS 6 Deng 2 Member 5363.04 Equiaxed granular dolomite cement filling
algae mound lattice pores
Formation time and filling time and
periods of pores
MX22-Z2d2-2 MX 22 Deng 2 Member 5418.70 Leaf-like dolomite cement filling pores
MX8-Z2d4-1 MX 8 Deng 4 Member 5115.19 Medium-coarse crystalline dolomite cement
filling pores
MX22-Z2d2-3 MX 22 Deng 2 Member 5418.70
XF-Z2d1-B2 Xianfeng (XF) Deng 2 Member Dolomite cement filling fractures in
micritic dolomite
Formation time and periods of fractures; to compare the relevance of filling materials in pores, vugs and
fractures
GS1-Z2d4-2 GS 1 Deng 4 Member 4985.00
MX9-Z2d2-1 MX 9 Deng 2 Member 5422.10 Multiphase fractures in algal lamina
dolomite filled with dolomite
MX22-Z2d2-4 MX 22 Deng 2 Member 5416.90 The fractures in algal lamina dolomite filled
with coarse crystalline dolomite