对油层微型构造的补充说明

A COMMENT ON THE INTERPRETATION OF MINI-STRUCTURE IN A RESERVOIR

本文提出微型构造是在砂体沉积的下切作用、砂泥岩差异压实及沉积古地形的影响下形成,与构造作用力无关。应用莱弗里特方程及油水重力分异解释微型构造影响油井生产的原因,指出正向微型构造油井的水驱油方向主要为向上驱油,负向微型构造油井主要为向下驱油,斜面微型构造油井为向上、向下和水平驱油;另外,由于重力分异使油由负向微型构造区向正向微型构造区运移,故产量有差异。最后对制作微型构造图的控制井点密度作了说明。

This paper indicates that the mini-structure are the results of downcutting under deposition and differential compaction in sandstone-shale, and the effect of paleogeomorphic feature in sedimentation. The effects of the mini-structures on well production are interpreted with Leverett equation and gravitational segregation. Furthermore this paper points out that direction of oil-water displacement is mainly along updip in a positive mini-structure and mainly along downdip in a negative mini-structure, and along updip, downdip and horizontal component in an inclined mini-structures. Furthermore, because of gravitational segregation, oil will migrate from a negative mini-structure to a positive mini-structure. Therefore, production will be different in case that mini-structures exist. Finally, well spacing required for mapping out mini-structrues are represented.