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

Fig. 1. Occurrence and characteristics of samples for dating. (a)(b) Cements filling dissolution vugs of various stages, ① to ⑤ are concentric ring-edge dolomite cement, radial dolomite cement, layered light-dark dolomite cement, late medium-coarse crystalline dolomite cement, and the latest coarse crystalline dolomite cement respectively, Deng 2 Member on Xianfeng profile; (c) Cements filling dissolution vugs of various stages. ① to ⑤ are respectively surrounding rock, leaf-like dolomite cement, coarse crystalline dolomite cement, quartz, and asphalt, 5418.70 m depth of Deng 2 Member in Well MX 22; (d) Equiaxed granular dolomite cement filling algae mound lattice pores, 5363.04 m depth of Deng 2 Member in Well GS 6; (e) Micritic dolomite. ① and ② are respectively dolomite cement filling fractures and surrounding rock, 4985.00 m depth of Deng 4 Member in Well GS 1; (f) Fractures and dolomite cement filling the fractures, 5422.10 m depth of Deng 2 Member in Well MX 9.