海相油气地质2017，Vol.22Issue(2)：51-58,8.DOI:10.3969/j.issn.1672-9854.2017.02.007
中国南方地区奥陶系 热液-岩溶改造型白云岩储层发育机理 ——以黔中地区下奥陶统为例
Developmental Mechanism of Ordovician Dolostone Reservoir Altered by Hydrothermal Karstification in Southern China:An Example from Qianzhong Uplift, Guizhou Province
摘要
Abstract
Taking Qianzhong Uplift in Guizhou Province as an example, the characteristics and developmental mechanism of the dolostone reservoir altered by hydrothermal karstification were discussed based on the outcrops survey and experimental analysis.The main lithology of Honghuayuan Formation and Tongzi Formation is dolostone with zebra grain structure, in which some dolomites, calcites and bitumen were filled in dissolution caves or tectonic fractures.The hydrothermal coarse dolomites filled have the features of curved surface and wavy extinction,which also present red cathode luminescence apparently. Theδ13CPDB values of the fil ing dolomites distributed between -2.2‰ and -0.8‰ with an average of -1.47‰; the δ18OPDB values varied from -12.2‰ to -7.6‰ with an average of -9.4‰ , which are more lighter than the matrix dolomites. The fil ing dolomites have a typical feature of positive Eu anomaly in REE composition with a highest point of 91.9. According to the geological evolution and fluid types, the reservoir development process can be described as follows: In Early Ordovician, there appeared penecontemporaneous dolomitization; from Late Ordovician to Early Silurian, the dolostone reservoir with karst fissure was developed as a result of karstification with the dolostone exposure to surface environment due to the Duyun Movement; in Early Devonian, the dolostones were altered further by tectonic and hydrothermal activities; consequently, the porous dolostone associated with solutional processes became the main reservoir for natural gas.关键词
黔中隆起/奥陶系/白云岩/储层/热液/溶蚀Key words
Ordovician/Dolostone/Reservoir/Hydrothermal/Karstification/Qianzhong Uplift分类
能源科技引用本文复制引用
刘子豪,朱东亚,吴胜和,张殿伟,张荣强,周末..中国南方地区奥陶系 热液-岩溶改造型白云岩储层发育机理 ——以黔中地区下奥陶统为例[J].海相油气地质,2017,22(2):51-58,8.基金项目
本文受国家自然科学基金项目"深层白云岩中硅质流体活动及其对储层发育的影响"(编号:41372149)资助 （编号:41372149）
