关键词: 海上, 低渗透油田, 开发矛盾, 控制因素

Abstract: This paper focuses on the geological characteristics of low-permeability oil reservoirs, such as small pore throats, difficult movement of fluids, low porosity and low abundance, as well as the development characteristics, such as natural productivity of oil production wells and poor capability of water injection wells for absorption of water. Based on the conditions of offshore oilfield development, the paper studies a series of problems of offshore low-permeability oil reservoir development, such as extreme injection-production well pattern, horizontal sweep efficiency and vertical producing degree, and injection-production balance. It also makes analysis of three basic contradictions facing offshore low-permeability oilfield development ---the contradiction between “using less wells for development” and “effective injection and production”, the contradiction between “high-efficiency production” and “low sweep efficiency” and the contradiction between “high-efficiency development” and “injection-production imbalance”. The main controlling factors of those contradictions can be attributed to a few development wells ofoffshoreoilfields becauseoftheoffshoreenvironment and high production cost.Withthestudyof the orientationtomake technological breakthrough, the paper points out that the efforts should be focused on improvement of single-well production and reduction of allocation in single-well engineering investment while exploring a new pattern for effective development in the areas of well type, well pattern and injection-production style.

Key words: offshore, low-permeabilityoilfields, developmentcontradiction, controlling factors