摘要
上扬子北缘地层沉积演化既受北部南秦岭构造、西部龙门山构造、同时也受北部汉南古陆的长期继承性隆起影响。震旦纪-早古生代,其北部为秦岭洋、西部为巴颜喀拉洋,沉积充填演化序列有别于扬子地台东南边缘。在铁船山组-西乡组火山-沉积岩系和南华系冰碛岩之上,主要经历了震旦纪初始碳酸盐台地、早中寒武世陆棚、晚末寒武世-早奥陶世碳酸盐台地及克拉通边缘隆升、中晚奥陶世台地淹没、晚奥陶-早志留世滞留陆棚沉积等阶段。沉积演化过程中,上扬子北缘地区形成了多套区域性烃源岩,也形成了多套有利的储层,主要包括灯影组藻礁-白云岩储层、仙女洞组鲕粒灰岩储层、沧浪铺组砂体储层、石龙洞组白云岩储层。储层分布广泛,尽管总体以低孔低渗为主,但部分地区白云岩、灰岩储层溶蚀作用发育,储集性较好,灯影组与石龙洞组是主要的储层与潜在勘探目的层,具有较好的油气勘探潜力。
The sedimentary evolution of the northern Upper Yangtze plate is affected by South Qinling structure on the north, Longmenshan structure on the west, and also long-term inherited uplift of Hannan paleocontinent on the north. In Sinian-Early Paleozoic with Qinling Sea on the north, Bayan Har Sea on the west, its sedimentary filling evolution is different from NE edge of Yangtze plate. On top of volcanic-sedimentary rock of Tiechuanshan Formation-Xixiang Formation and tillite of Nanhua System, mainly underwent carbonate platform in Sinian, shelf in Early-Middle Cambrian, carbonate platform and pericratonic uplift in Late Cambrian-Early Ordovician, platforms drowning in Middle Ordovician, and shelf deposition in Late Ordovician-Early Silurian. Some sets of regional source rock and favorable reservoir are formed in the sedimentary evolution. The reservoir mainly include algal reef-dolomite reservoir of Denigying Formation, oolitic limestone reservoir of Xiannvdong Formation, sand reservoir of Canglangpu Formation, and dolomite reservoir of Shilongdong Formation. The reservoir distributes widely. Although dominated by low porosity and low permeability overall, carbonatite reservoir in some areas develops corrosion and the permeability is favorable. The Dingying Formation and Shilongdong Formation are the main reservoir and potential exploration target in northern Yangtze plate, in which oil and gas exploration potential is considerable.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第3期672-680,共9页
Acta Petrologica Sinica
基金
中石化南方分公司项目资助
关键词
扬子北缘
震旦纪
早古生代
沉积演化
储层分布
Northern Yangtze Plate
Sinian
Early Paleozoic
Sedimentary evolution
Reservoir distribution
