摘要
塔中地区奥陶系地层具有埋深大、剥蚀显著的特点。依据地震、测井和地化资料,运用趋势外延法和Ro最高古地温法,结合沉积地层回剥技术对塔中地区T_7~4、T_7~2、T_7~0三个区域不整合面形成时期的古地貌进行恢复:塔中地区奥陶纪地势较相对平缓,构造不发育,隆起与凹陷间存在缓斜坡。古隆起主要存在于塔中地区西侧和塔中中东部,继承性发育,从加里东中期Ⅰ幕至海西早期隆起区面积和高差逐渐减小。古地貌格局影响碳酸盐岩沉积速率,进而影响台地边缘迁移以及礁滩分布,同时对储集层物性具有明显改造作用,塔中Ⅱ号断裂带地区遭受多期抬升剥蚀,发育多期岩溶叠置区,是岩溶储集层最有利区带。
The Ordovician strata in central Tarim Basin has the characters of large depth and significant erosion. According to the seismic, well logging and geochemical data, by the adoption of trend extrapolation and Ro highest paleogeothermal theory and combined with sedimentary strata backstripping technology, the paleogeomorphology of regional unconformity interface T7 4, T7 2 and T7 0 are recovered. In the Ordovician, central Tarim Basin is relatively flat terrain with less development structure features, and slow slopes existed between uplifts and depression, in addition, palaeohigh mainly develops in the west and middle-east of this area with characteristic of inheritance. The area and height of palaeohigh gradually decrease from the first episode of the middle Caledo- nian to early Hereynian area. The distribution of paleogeomorphology not only influence the deposition rate of carbonate rock, the migration of platform margin and the distribution of reefs and beaches, but also significantly reform reservoir properties, in central Fault zone Tarim II Basin experiences multi-phase erosion and develops multi-stages karst superimposed area, which is the most favorable area for the development of Karst reservoir.
出处
《油气藏评价与开发》
CSCD
2017年第3期1-6,共6页
Petroleum Reservoir Evaluation and Development
基金
国家重点基础研究发展计划"973"项目"中国海相碳酸盐岩层系多种储层形成机理与分布模式"(2005CB422103)
国家科技重大专项课题"海相碳酸盐岩层系优质储层分布与保存条件评价"(2009ZX05009-002)
关键词
塔中地区
奥陶纪
不整合面
古地貌
岩溶储集层
central Tarim Basin, Ordovician, unconformity surface, paleogeomorphology, karst reservoir
