摘要
四川盆地多数碳酸盐岩缝洞型气藏储层压力高,主力产层段的取心整体破损较多,利用现有岩心开展室内流动模拟实验较为困难。数字岩心分析技术作为储层微观结构和渗流特征研究的又一项新兴的重要技术手段,具有可动态模拟地层条件下流动参数,不破坏岩心等特点,可以用于四川盆地碳酸盐岩缝洞型储层流动实验研究。以该类气藏真实岩心CT扫描结果为基础,建立数字岩心三维模型,并利用有限元三维数字岩心流动模拟技术,模拟分析了在地层条件下流体的流动情况,得出其流动规律:在缝洞型储层中裂缝是流体主要的渗流通道,流体主要按照溶洞、基质、裂缝、出口的流动秩序逐次进行,其气体能量损耗主要发生在缝洞间的基岩部分。三维数字岩心流动模拟技术应用数字化手段对储层渗流规律和机理进行综合分析,可为该类气藏的开发对策提供必要的数据支撑。
Due to the high pressure of carbonate fractured-vuggy reservoirs in Sichuan basin,it is extremely hard to keep the integrity of core samples from main production layers during coring.This problem leads to very few flow experiments which can be carried out.Digital core is a new technology for reservoir micro- structure analysis and micro-flow characteristics research which can simulate seepage process in formation condition and calculate the relevant parameters without destroying the core.This technique can be applied to the flow experimental study of carbonate fractured-vuggy reservoirs in the Sichuan Basin.In this paper, based on core CT scan results,3D models of digital cores have been established.By using numerical simula- tion based on finite element method, the flow law in condition of stratigraphy has been revealed through a- nalysis.Result shows fractures are the most important flow channel in the fractured-vuggy reservoirs.Gas flowed in sequence of vuggy, matrix,fracture,export and flow energy loss mainly occurs in the tight matrix between the fracture and the cave.This research demonstrates the 3D digital core is a useful method for an- alyzing reservoir seepage law and mechanism.And it can provide necessary data which provide supports for making appropriate countermeasures in gas reservoir development.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2017年第9期1425-1432,共8页
Natural Gas Geoscience
基金
国家科技重大专项"四川盆地大型碳酸盐岩气田开发示范工程"(编号:2016ZX05052)资助
关键词
三维数字岩心
流动模拟
缝洞
有限元
3D digital core
Flow simulation
Fractured-vuggy
The finite element analysis
