小型断块油藏识别和描述

Identification and description of small faulted-block reservoirs

勘探开发实践表明,断块油田开发中后期仍存在许多小型断块原始油藏,这些小型断块油藏隐蔽性强、常规手段难以识别。通过断裂构造的物理模拟和构造应力场分析,认为胜利油区断块油田的形成与6种断裂带有关,大中型断层的应力集中、转向和释放处发育小型断层,小型断层与大中型油源断层交汇处的圈闭成藏条件好。在分析和预测了不同断裂带小型断块油藏分布规律的基础上,利用高精度三维地震等技术,成功地在胜利油区识别和描述了150多个小型断块油藏。由于断块油田开发中后期地面设施齐全,尽管小型断块油藏储量规模较小,但开发效益好,是我国东部断陷盆地原油增储上产的重要目标。

The practice of petroleum exploration and development shows that there are still great oil reserves undiscovered in different small faulted-block reservoirs in the late period development of faulted-block oilfield. The small faulted-block reservoirs are secret in the subtle oil-pools and difficult to be found out. The investigation of physical stimulation and stress-field analysis on different types of fault zones showed that the faulted-block oilfields occurred in six types of fault zones in the rift basin of the eastern China. The small faults formed faulted-block traps at the conjunction of two or three big faults, turning points and stress immerging area of a big fault. The faulted-block traps have good condition for generating reservoirs at the connections of the small and big faults. Having predicted the possible distributions of the small faulted block reservoirs, 150 faulted-block reservoirs in the developed faulted-block area of Shengli Oilfield were identified and described by applying the integrated high-precision seismic survey technique. Although oil reserves are small in the small faulted-block reservoirs, a great benefit can be received because of the good equipments for the late-period development in the studied areas. The small faulted-block reservoirs are the important targets for increasing oil reserves and production of the faulted-block oilfields in the rift basins of East China.