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陇东侏罗系油藏处于“双高”开发阶段,套破井多,注采井网不完善,水驱状况差;剩余油分布零散,稳产难度大。本次研究采取多种手段研究剩余油分布规律:1多油层叠合区纵向上原主力层动用程度高,未动用的非主力层剩余油富集;2注水开发的层状、块状油藏剩余油平面上主要分布在边部低渗区、注水滞留区;纵向上主要分布油藏内部未水驱的微构造高部位;3边底水油藏剩余油分布受底水影响大,纵向上分布在油层顶部及构造高部位,平面上分布在隔层发育区、套破井连片区及边部未动用区;4分部范围小、厚度薄、数量多的小油砂体,由于注采井不完善,油层动用差剩余油富集。确定油田稳产确定潜力区,并开展不同时期不同油藏优化稳产技术研究,解决制约老油田稳产的矛盾与问题,提高对油藏的控制能力与储量动用程度,改善油田开发效果。
Longdong Jurassic reservoirs are in the development stage of “double high”, with many sets of wellbores broken, imperfect injection well pattern and poor waterflooding conditions; the remaining oil is scattered and stable and difficult to produce. In this study, a variety of means to study the distribution of remaining oil: 1 multi-reservoir superimposed area longitudinal upper main main layer with a high degree of unused non-main strata remaining oil enrichment; 2 water developed stratified, massive reservoir surplus The oil level is mainly distributed in the low permeability zone and the stagnant water injection zone. The vertical distribution of micro-structures in the reservoir is mainly due to the non-water-flooded micro-structure. The residual oil distribution in the three-edge bottom water reservoir is greatly influenced by the bottom water and longitudinally distributed At the top of the oil layer and the high structural part, it is distributed on the plane in the compartment development zone, the set of wellbore contiguous zone and the unused area of the margin. The small oil sands body with small area, thin thickness and large number of 4 subdivisions, Imperfect, poor reservoir utilization surplus oil enrichment. To determine the potential areas for stable production of oilfields and to carry out researches on optimizing stable production technologies for different reservoirs in different periods to solve the contradictions and problems that restrict the stable production of the old oilfields and to improve the controllability and reserve utilization of the reservoirs and to improve the oilfield development effects.