The dating and temperature measurement technologies for carbonate minerals and their application in hydrocarbon accumulation research in the paleo-uplift in central Sichuan Basin, SW China

SHEN Anjiang,ZHAO Wenzhi,HU Anping,WANG Hui,LIANG Feng,WANG Yongsheng

Fig. 2. Characteristics and occurrences of host minerals containing inclusions, dolomite cements and associated bitumen in Dengying Formation, Sichuan Basin. (a) Well Gaoshi 6, Deng 2 Member, 5363.04 m, dolomite core sample, with gray-black surrounding rock, dissolution vugs and dolomite cement visible; (b) Ebian Xianfeng section, Deng 2 Member, algal micritic dolomite; with dissolution vugs completely filled by grape lace dolomite cement, outcrop rock sample; (c) Well Gaoshi 1, Deng 4 Member, 4985.00 m, algal lamina/algal stroma/algal dolomite framework; with algal framework pores and dissolution vugs filled by quartz cement and bitumen, plane polarized light; (d) Well Moxi 22, Deng 2 Member, 5418.70 m, algal micritic dolomite; with dissolution vugs successively filled by foliated dolomite→saddle-shaped dolomite→quartz→bitumen, plane polarized light; (e) Well Moxi 8, Deng 2 Member, 5422.10 m, power-fine crystalline dolomite, with residual cryptomonas texture and well-developed dissolution vugs successively filled by foliated dolomite→saddle-shaped dolomite→quartz→bitumen, plane polarized light; (f) Well Gaoshi 1, Deng 4 Member, 4985.00 m; saddle-shaped dolomite filling vugs emits orange light, and the foliated dolomite does not emit light, cathodoluminescence; (g) Well Moxi 22, Deng 2 Member, 5416.90 m, fine crystalline dolomite; with the dissolution vugs filled with fine crystalline dolomite ① and bitumen ②. The bitumen is free in the vugs in film form, plane polarized light; (h) Well Gaoshi 6, Deng 2 Member, 5363.04 m, fine crystalline dolomite; with dissolution vugs filled by fine-medium crystalline dolomite ①, bitumen ② and coarse crystalline dolomite ③; the bitumen is free in the vugs in film form, plane polarized light; (i) Gucheng section, Deng 2 Member, microbial dolomite; with dissolution vugs filled by coarse crystalline dolomite ① ③ and bitumen ②; the bitumen is patchy and sandwiched between the two stages of dolomites, plane polarized light.