摘要
为探索造成塔里木盆地克拉2气田在开发过程中见水井数增加,不同构造部位气水界面上升不一致的机理,引进了地应力分析方法。通过建立三维动态地应力场模型,提取断层和裂缝面上的剪应力及有效正应力,计算剪应力与有效正应力比值的变化量,评价断层和裂缝在应力场演化过程中的力学活动性能,寻找与开发井出水的对应关系,研究气井出水机理。研究发现,地应力动态变化过程中断层和裂缝力学活动性能增强是导致气田出水主要原因,另外,不同构造部位断层和裂缝力学活动性能变化不同,造成气田不同构造部位气水界面上升不一致。
An in-situ stress analysis method is introduced to understand the reason for increase of water-breakthrough wells and the mechanism of mismatch of gas-water contact rising at different structural positions. After the establishment of a 3D dynamic in-situ stress field model, shear stress and effective normal stress on the surfaces of faults and fractures are extracted, variation of shear stress to effective normal stress ratio is calculated, mechanical activity performances of faults and fractures during stress field evolution are evaluated, by which the corresponding relation with water-breakthrough in gas production wells could be found and the mechanism of water-breakthrough in them could be clearly understood. . The study shows that the enhancement of fault and fracture activities during the dynamic change process of in-situ stress is the main reason for water production in the gas field. Additionally, the differences of mechanical activity performances of faults and fractures at different structural positions result in the mismatch of gas-water contact rising at different structural positions.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2016年第5期571-574,共4页
Xinjiang Petroleum Geology
关键词
塔里木盆地
克拉2气田
出水
气水界面
动态地应力
断层
力学活动性能
Tarim basin
Kela-2 gas field
water production
gas-water contact
dynamic in-situ stress
fault
mechanical activity performance
