地质学报2011，Vol.85Issue(4)：543-556,14.DOI:CNKI:11-1951/P.20110330.1319.065
安徽无为-巢湖地区中下二叠统碳酸盐岩成岩作用
Diagenesis of the Lower-Middle Permian Carbonate in the Wuwei-Chaohui Area, Anhui Province
摘要
Abstract
Diagenesis controls the porosity evolution, which is of great indicative importance for the exploration of the oil and gas. The Middle-Lower Permian carbonate in the Wuwei-Chaohui area, Anhui Province, is well developed and widely distributed with abundant organic materials. Years' studies have focused only on strata, paleontology and sedimentary facies, but little on diagenesis. Microscopic examination shows that there are four major destructive diageneses such as dissolution, dedolomitization, pressure solution, and tectonic rupture, and six types of constructive diaenesis namely micritization, compaction, cementation,dolomitization, silicification, and recrystallization developed in the studying area. Combined with the C-O isotope analysis results, this area has three main diagenetic environments such as marine (shallow marine platform and deep sea slope), meteoric (vadose and phreatic zone), and burial, which response to different diagenesese. Micritization (shallow marine platform) and the first type of silicification (deep sea slope)occurs in marine environment; burial environment contains mainly compaction, pressure solution,dolomitization, the third type of selective silification and late recrystallization; meteoric environment develops cementation (including drusy isopachous rim cement, drusy cement and coaxial accretion cement,belonging to phreatic zone, gravity-type cement and crescent cement, belonging to vadose zone),dissolution, early recrystallization, dedolomitization and the second type of silicification. Along with rich organic matters, the studying area has high porosity, up to 2％ ～ 5％, and mainly developed in the pressure solution of Chuanshan and Qixia Formations, and in the silicon members and silicon highly contained limestone of Qixia Formation. Excellent connectivity and rich organic matter make it the ideal place for generation, storage and migration of the gas and oil. Therefore, this study is of great theoretical and strategical significance for the further geological study and prediction and exploration of the gas and oil in Anhui Province.关键词
成岩作用/中下二叠统/碳酸盐岩/无为-巢湖地区/安徽Key words
diagenesis/ Middle-Lower Permian/ carbonate/ Wuwei-Chaohu area/ Anhui Province引用本文复制引用
杜叶龙,李双应,王冰,赵大千,杨栋栋..安徽无为-巢湖地区中下二叠统碳酸盐岩成岩作用[J].地质学报,2011,85(4):543-556,14.基金项目
本文为安徽省自然科学基金项目(编号 070415205)、国家自然科学基金项目(编号 40972082、40572076)和中国石油化工股份有限公司项目(中上扬子及邻区古生代古沉积环境演化研究)联合资助成果. （编号 070415205）
