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
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1.中国石化西北油田分公司;2.中国地质大学(北京);3.中国石化石油勘探开发研究院

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TE122. 1

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Characteristics and description of current local stress field in strike slip fault zone of Shunbei area, Tarim Basin
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Northwest Oilfield Branch Company Ltd., SINOPEC

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    摘要:

    现今地应力场是开展油气工程的基础,其分布特征更是储层改造的关键。顺北地区目的层是受断裂带控制的缝洞型储集体,需要压裂改造,但顺北主干断裂带的现今应力场分布特征目前尚不明确。利用测井资料、油气井动态数据以顺北1号、顺北5号、顺北7号断裂带为研究目标,计算研究区现今应力场大小及方向,建立单井应力剖面,进而探讨走滑断裂带不同应变分段现今地应力分布的差异性,并在此基础上利用离散元数值模拟的方法开展断裂带对现今地应力分布特征影响的研究。研究结果表明:顺北地区最大主应力大小为180~220MPa,方向为NE39°~46°;中间主应力大小为178~187MPa,方向为垂向;最小主应力方向为SE129°~136°,整体处于走滑应力状态。走滑断裂带会对水平主应力方向起到扰动作用,在断裂带附近水平最大主应力会发现明显的扭转,趋于与断层走近平行的状态。走滑断裂带不同应变分段的现今应力场状态不同,不同应变分段的垂向主应力和最小主应力没有差别,差异主要体现在最大水平主应力,叠接隆起段受到的水平挤压作用最强,高达227MPa,其次是平移段,拉分段的水平挤压作用明显减弱,只有197MPa。

    Abstract:

    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.

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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, , ():

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  • 收稿日期:2021-01-26
  • 最后修改日期:2021-04-21
  • 录用日期:2021-04-21
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