微幅度构造识别方法及利用浮力开发油田

通过高分辨率三维地震剖面的解释，并结合开发井的层位校正，确定了大庆长垣南部太190油田中微幅度构造的基本特征。该区广泛存在的微幅度构造控制着油田注水开发效果及剩余油的分布。重力作用是影响油田注水开发效果的主要原因，由油水重力分异而产生的浮力是油田注水开发过程中可以利用的一种驱动力。试验结果表明，利用浮力使剩余油在短距离内短时间再聚集是可行的，因而在砂体窄小、微幅度构造发育的复杂断块油藏，利用浮力采油是一种有效的改善油田注水开发效果的方法。在井网加密调整的过程中，油井应布在微幅度构造的高点及斜坡部位，这样可以利用浮力，采用油水井间抽、间注的方式有效地开采剩余油。

Recognition method of micro-relief structures in complicated structural reservoirs and the application of buoyance in oilfield development

Based on the basic structural characters of T oil field in south part of Daqing placanticline determined by high-resolution 3-D seismic profile data, this paper proposes that the micro-relief structures control the remaining oil distribution and the results of water injection in the oil field. It is because of gravity that the micro-relief structures affect the water injection results. The buoyancy out of oil and water gravity segregation is the new drive force to be used in water flooding. Showed from the results of the experiment, it is feasible for the buoyancy to re-gather the remaining oil for a short time in near distance. So with the intermittent injection and production of wells during recovering the remaining oil, to use buoyancy is a good method for improving development results of the complex fault-block reservoir with small and narrow sand bodies and micro-relief structures.