华蓥天池涧水沟剖面长兴组台内礁滩剖面精细地质研究Fine Geological Study about Inner Platform Reef and Shoal Profile of Changxing Formation in Jianshuigou, Tianchi of Huaying
李赞, 胡忠贵, 王齐禄, 施琰, 张恩达, 唐刚
川东地区, 涧水沟剖面, 长兴组, 台内礁滩East Sichuan Basin, Section of Jianshuigou, Changxing Formation, Inner Platform Reef and Shoal
《Advances in Geosciences》, Vol.5 No.2, 2015-04-30
Reefs and shoals are favorable sedimentary facies about carbonate rock oil and gas exploration. Cla-rifying the distribution and evolution of inner platform reef and shoal facies is important to oil and gas exploration in inner platform of eastern Sichuan. Through fine realistic and detailed study of Jianshuigou reef profile of Changxing Formation in Tianchi of Huaying, Guangan, this paper in depth researches the internal composition of reef, depicts the internal structure and the formation patterns of the reef, and points out the distribution of favorable reservoir inside the reef. Three growth cycles of reef have been identified, which is made up of reef base and reef core. The growth cycle of reef was consisted by reef base and reef core, among them grain shoal constitutes the reef base and skeleton reef or barrier reef constitutes the reef core. Three reef cycles were identified in the profile, which correspond to the three upward shallowing parasequence sets, and overall constitute accretion - into product type reef. The second reef cycle is the most developed. Complexes dolomitization is strong in the growth cycle phases of the top reef, and is good for the formation of reservoir.