中国近海陆相典型沉积类型油田水驱高效开发模式探讨

摘要

The development of offshore oilfield has the characteristics of less evaluation data,high development cost and limited life span of platform.Reasonable development modes for different sedimentary type oilfields are necessary to achieve economic and efficient development in platform life span.According to reservoir recognition and adjustment practices of three typical continental sedimentary oilfields,such as SZ36-1,QHD32-6 and BZ25-1S,three characteristics are generalized,which are the recognition limitation of geology and reservoir characteristics in the early stage of evaluation,special characteristics of optimal water drive development mode under high cost condition and the adjustment effect difference of water flooding development for different sedimentary types,respectively.The principle of benefit priority and risk avoiding for high efficient water flooding and the strategy of first solving the plane and vertical contradiction are proposed.Based on the principle and strategy,three development modes for high efficient water flooding are proposed,which are the mode of primary well pattern,a set of layers and commingled production and subdivided injection for lacustrine delta sedimentary oilfield,the mode of second well pattern,multi-stage and subdivided layers for meandering river sedimentary oilfield,and the progressive development mode of a set of layers for shallow water delta sedimentary oilfield.The results provide mode reference for the same continental sedimentary offshore oilfields.%海上油田开发具有早期评价资料少、开发成本高、平台寿命受限的特点,不同沉积类型油田需要选取合理开发模式,实现平台寿命期内经济高效开发.分析了中国近海绥中36-1油田、秦皇岛32-6油田、渤中25-1S等3个陆相典型沉积类型油田地质油藏认识过程和开发调整实践过程,总结出了“三性”特征,即早期评价阶段地质油藏特征认识的局限性、高成本条件下水驱开发模式优选的特殊性、不同沉积类型水驱开发调整效果的差异性,提出了水驱高效开发效益优先兼顾风险规避的原则和平面矛盾与纵向矛盾优先解决的策略;依据所提原则和策略,提出了3个陆相典型沉积类型油田的水驱高效开发模式,即湖泊三角洲沉积油田一次井网一套层系合采分注模式、曲流河沉积油田二次井网分期分层系开发模式、浅水三角洲沉积油田一套层系滚动开发模式,为海上同类型新油田开发提供借鉴.