复杂断裂低渗透薄互层纯化油田开发模式

The development mode of complicatedly fractured, low-permeability and thinly in terbed reservoir in Chunhua oil field

纯化油田断裂的复杂性在济阳坳陷具有典型性 ,油藏储集层为低渗透、薄互层 ,因此油田开发 3 0年中的主要矛盾是平面与层间矛盾。以早期构造模型和精细构造模型为基础 ,以增储上产为核心 ,先后进行了弹性开发、注水开发、加密完善、分层开采、滚动探边、零星完善及注采结构调整等 ,很好地解决了油田平面矛盾并缓解了层间矛盾。近年来油田剩余油分布规律研究表明 :剩余油富集区实质上位于静态遮挡与动态水势控制而形成的低势闭合区 ,在构造低部位特高含水区的更低部位钻井 ,仍可获得不含水井的显著效果 ,这是与正向型微构造区不同的新类型与新潜力领域 ,对注水老油田的进一步挖潜具有重要的理论与实际意义。

Chunhua oil field is characterized by the features of complicated fracture, low -permeability and interbed thin layers. The complexity of fracture is typical i n Jiyan g depression. On the basis of early structural style and delicate structural sty le and for the purpose of reducing interlayer and lateral conflicts and increasi ng the reserves and oil production, a system engineering was used successively i n Chunhua oil field through more than 30 years of development, which includes pr oducing oil by elastic drive, waterflooding development, infill drilling, zonal production, progressive delineation, sporadic development, improvement, modifica tion of injection-production pattern and so on. And has got a good result in th e development of reservoirs with complicated fractures, low permeability and int erbed thin layers. The oil produc tion was more than 4×10~6t in 1980, and then from 1981 to 2000 this production was stably increased. Studies on the distribution rule of remaining oil in Chun hua oil field indicate that remaining oil enrichment region is virtually a lower potential close region formed by static shelter and dynamic potential of water. In practice, wells newly drilled in the lower structural region with high water cut did not produce water in early days. This maybe provides a new type and reg ion of potential tapping that is different from the so-called 'potential regio n', which is the positive microstructures, and also have theoretic and practica l significance in guiding the direction of tapping potenti al old fields like Chunhua from 2001 to 2005.