摘要
塔河奥陶系缝洞型碳酸盐岩油藏开发近10年仍没搞清油水界面变化规律,给油藏开发带来很多困惑。以缝洞特征和流动状态研究为突破口,按溶洞系统、分支溶洞和微小孔洞分布特征和流动状态特征逐次研究油水界面变化:①溶洞中为典型的管流特征,油水接触为面接触,在微小缝洞中为渗流,油水接触为点状锥进和存在油水过渡带。②溶洞体中油井见水是水推进到井底,可以代表溶洞油水界面的深度和推进时间,微小缝洞中见水是水锥进造成,不代表油水界面的变化情况。③边水在油藏开发过程中逐步向溶洞系统顶部推进,一定条件下逐次向分支溶洞推进和微小孔洞锥进,形成各缝洞体不同部位、不同采出程度条件下参差不齐的相互交杂的油水界面。
The development on Ordovician carbonate reservoir of Tahe has been carried out for 10 years but the variance regu-larity on its oil-water contact hasn't been reached,which brings lots of confusion for reservoir development. Starting from the study on fracture-cavity characteristics and flow-ing status,the cave systems,the distribution characteristics of the karst caves,tiny holes and flowing status have been considered to study the oil-water contact variance in the pa-per.① the typical characteristics of pile flow in caves: sur-face contact is oil-water contact; seepage in tiny fracture -cavity and the oil-water contact is coning in dot scope and there is oil-water transitional zone; ② the breakthrough in caves is caused by pushed bottom water,which could present the depth of oil-water contact and time of water-pushing,while in tiny fracture-cavity,the breakthrough doesn't stand for oil-water contact variance; ③ edge of water in reservoir development process is pushed forward to the top of the cave system step by step,under certain conditions,coning to branch caves and tiny fracture-cavity successive-ly,forming different oil-water contact in different parts of body and showing different recovery degree.
出处
《石油地质与工程》
CAS
2010年第2期79-81,84,共4页
Petroleum Geology and Engineering
关键词
塔河
缝洞型
碳酸盐岩油藏管流
水推油
油水界面
变化规律
溶洞系统
Tahe
fracture-cavity type
carbonate res-ervoir pipe flow
water to push oil
oil-water interface
changes in law
cave system
