Northwest Oilfield Branch Company Ltd., SINOPEC
In-situ stress field is the basis of oil and gas engineering, and its distribution characteristics are the key to reservoir reconstruction. The target reservoir in Shunbei area is a fractured vuggy reservoir controlled by the fault, which needs fracturing treatment. However, the current stress field distribution characteristics of the main fault zone in Shunbei area are still unclear. By using logging data and oil and gas well performance data, taking Shunbei 1, Shunbei 5 and Shunbei 7 fault zones as the research target, the size and direction of current stress field in the study area are calculated, the single well stress profile is established, and then the difference of current geostress distribution in different strain segments of strike slip fault zone is discussed. On this basis, the influence of fault on current geostress is carried out by using discrete element numerical simulation method Research on the influence of force distribution characteristics. The results show that: the maximum principal stress in Shunbei area is 180 ~ 220MPa, the direction is NE39 °~46 °, the middle principal stress is 178 ~ 187MPa, the direction is vertical; the minimum principal stress is SE129 °~136 ° and the whole area is in the state of strike slip stress. The strike slip fault zone will disturb the direction of horizontal principal stress, and the maximum horizontal principal stress near the fault zone will find obvious torsion, which tends to be parallel to the fault. The present state of stress field is different in different strain segments of strike slip fault zone, and there is no difference in vertical principal stress and minimum principal stress in different strain segments. The difference is mainly reflected in the maximum horizontal principal stress. The horizontal compression of superimposed uplift segment is the strongest, up to 227MPa, followed by the translational segment, and the horizontal compression of tensile segment is obviously weakened, only 197MPa.
杨敏,赵腾,赵锐,等. 塔里木盆地顺北地区走滑断裂带内部现今局部地应力场特征与描述[J]. 科学技术与工程, , ():复制