摘要
在分析低渗油田国家分类标准的基础上,基于低渗油田启动压力梯度和岩心应力敏感性实验,形成了我国海上低渗油田分类标准:渗透率在10~50mD的油田为一般低渗透油田,此类油田储层可忽略启动压力梯度和压敏效应;渗透率在5~10mD的油田为特低渗透油田,此类油田储层存在启动压力梯度,但压敏效应可忽略;渗透率低于5mD的油田为超低渗透油田,此类油田储层同时存在启动压力梯度和压敏效应。根据这一分类标准,可以较好地梳理中国近海低渗油田的油气资源,筛选出在目前技术和经济条件下适合开采的低渗油田。
According to an analysis of the national classification for low-permeability oilfields and some experiments of threshold pressure gradient and core stress sensitivity in low-permeability oilfields, a new classification was developed for the low-permeability oilfields offshore China. In this new classification, the oilfields with permeability between 10~50 mD are considered as GENERAL low-permeability oilfields, in whose reservoirs the effects of threshold pressure gradient and stress sensitivity can be ignored~ the oilfields with per- meability between 5 ~ 10 mD are referred to SPE- CIAL low-permeability oilfields, in whose reser- voirs the stress sensitivity effect can be ignored, but the effect of threshold pressure gradient ex- ists~ and the oilfields with permeability below 5 mD are referred to ULTRA low-permeability oil- fields, in whose reservoirs both the effects of threshold pressure gradient and stress sensitivity exist. This new classification can be used to classi- fy reasonably the low-permeability hydrocarbon re- sources offshore China and select the low-permea- bility oilfields that can be developed effectively un- der the present technology and economy.
出处
《中国海上油气》
CAS
北大核心
2012年第6期25-27,共3页
China Offshore Oil and Gas
基金
中海油研究总院2009-2011年度综合科研项目"海上三低油田开发关键技术评价研究"部分研究成果
关键词
海上低渗油田
分类标准
应力敏感性
启动压力梯度
low-permeability oilfield
classification
stress sensitivity
threshold pressure gradient