摘要
柴达木盆地南翼山油田浅层油藏以低压为主,伴随部分常压和少量高压。针对压力系统复杂的问题,从地层流体性质、封闭机制、构造运动等方面剖析低压油藏形成机理及浅层低压油藏压力演化与成藏耦合关系。研究表明,膏质泥岩和断层为南翼山浅层压力系统提供封闭条件;南翼山浅层油气藏是深部油气藏在喜山晚期构造运动破坏后,通过断层调整到浅部圈闭而形成;新构造运动抬升作用导致储层孔隙反弹和流体降温收缩,分别使浅层油藏压力降低10.50 MPa和7.68 MPa,是南翼山浅层油藏低压形成的重要原因。
Shallow reservoirs in Nanyishan Oilfield in the Qaidam Basin are mainly in low pressure,with some parts in normal pressure and local parts in high pressure. Considering the complex pressure system,the formation mechanism of shallow reservoirs with low pressure was dissected from several aspects,such as formation fluid properties,sealing mechanism and tectonic movement,so as to identify the coupling relationship between low pressure evolution in shallow reservoirs and hydrocarbon accumulation. The study indicates that gypsiferous mudstone and faults provide sealing conditions for shallow pressure system in Nanyishan Oilfield. Shallow reservoirs in Nanyishan Oilfield were formed by the deep reservoirs that migrated to shallow traps through faults after being destructed during late Himalayan movement. Uplift by Neotectonic movement led to reservoir pore rebound and fluid cooling shrinkage,reducing shallow pressure by 0. 50 MPa and 7. 68 MPa respectively,which is the key factor for forming low pressure in shallow reservoirs in Nanyishan Oilfield.
出处
《特种油气藏》
CAS
CSCD
北大核心
2014年第5期24-28,152,共5页
Special Oil & Gas Reservoirs
基金
国家自然科学基金青年项目"三塘湖盆地侏罗系低压油藏形成机制研究"(40802027)
中国石油天然气股份有限公司风险创新基金项目"柴西北中浅层低压油藏形成机制研究"(0706d01040102)
关键词
南翼山油气藏
低压
形成机理
封闭机制
构造抬升
Nanyishan reservoirs
low pressure
formation mechanism
sealing mechanism
tectonic uplift
