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    沈杰, 徐浩, 邓虎成, 何建华, 李国峰, 刘岩, 宋威国, 邓乃尔. 复杂断裂区地应力场分布特征及扰动机制研究——以鄂尔多斯盆地定北地区上古生界为例[J]. 中国地质. DOI: 10.12029/gc20230421004
    引用本文: 沈杰, 徐浩, 邓虎成, 何建华, 李国峰, 刘岩, 宋威国, 邓乃尔. 复杂断裂区地应力场分布特征及扰动机制研究——以鄂尔多斯盆地定北地区上古生界为例[J]. 中国地质. DOI: 10.12029/gc20230421004
    SHEN Jie, XU Hao, DENG Hucheng, HE Jianhua, LI Guofeng, LIU Yan, SONGWeiguo, DENG Naier. Distribution characteristics and disturbance mechanism of geostress field in complex fault zone: A case study of Upper Paleozoic in Dingbei area of Ordos Basin[J]. GEOLOGY IN CHINA. DOI: 10.12029/gc20230421004
    Citation: SHEN Jie, XU Hao, DENG Hucheng, HE Jianhua, LI Guofeng, LIU Yan, SONGWeiguo, DENG Naier. Distribution characteristics and disturbance mechanism of geostress field in complex fault zone: A case study of Upper Paleozoic in Dingbei area of Ordos Basin[J]. GEOLOGY IN CHINA. DOI: 10.12029/gc20230421004

    复杂断裂区地应力场分布特征及扰动机制研究——以鄂尔多斯盆地定北地区上古生界为例

    Distribution characteristics and disturbance mechanism of geostress field in complex fault zone: A case study of Upper Paleozoic in Dingbei area of Ordos Basin

    • 摘要:研究目的】定北地区上古生界致密气资源丰富,勘探潜力巨大,但区内断裂广泛发育,断裂带附近地应力场特征规律不明,严重制约该区油气勘探开发。【研究方法】为此,本文基于差应变实验、声发射实验、测井解释地应力大小、波速各向异性实验、古地磁实验、成像测井与偶极声波测井资料解释地应力方向、数值模拟等多方法融合开展研究区上古生界地应力场特征精细解析,以期查明定北地区地应力场分布特征及其扰动机制。【研究结果】研究表明,定北地区上古生界三向应力具有垂向主应力>最大主应力>最小主应力的特征,区域地应力场大小主要受断裂带控制,应力扰动程度与断裂部位、断裂规模、断裂成因等因素有关,其中溶塌型断裂带区域三向应力相对最低。区域主应力场方向为N35°E~N45°E,储层地应力方向主要受区域主应力场方向和断裂带控制,不同类型断裂带引起的地应力扰动范围和扰动程度存在差异,其中地应力扰动范围主要受断裂走向与断层长度所影响。【结论】基于地应力场特征研究,本文明确了定北地区地应力大小及方向的分布特征和扰动规律,探讨了不同成因断裂带对地应力大小的扰动机制,并建立了研究区地应力方向扰动宽度预测模型,对后续井网部署及压裂改造等具有重要参考价值。

       

      Abstract: Objective Dingbei area is rich in tight gas resources of Upper Paleozoic and has great exploration potential. However, faults are widely developed in this area, and the characteristics of geostress field near the fault zone are unknown, which seriously restricts oil and gas exploration and development in this area. Methods Therefore, this paper conducts a detailed analysis of the characteristics of the Upper Paleozoic geostress field in the study area based on differential strain experiment, acoustic emission experiment, logging interpretation of geostress size, wave velocity anisotropy experiment, paleomagnetism experiment, imaging logging and dipole acoustic logging data interpretation of geostress direction, numerical simulation and other methods, in order to find out the distribution characteristics and disturbance mechanism of the geostress field in Dingbei area. ResultsThe research shows that the three-dimensional stress of Upper Paleozoic in Dingbei area has the characteristics of vertical principal stress > maximum principal stress > minimum principal stress, and the regional geostress field is mainly controlled by the fault zone, and the stress disturbance degree is related to the fault location, fault scale, fault genesis and other factors, among which the three-dimensional stress in the karst fault zone is relatively lowest. The direction of regional principal stress field is N35°E~N45°E. The direction of reservoir geostress is mainly controlled by the direction of regional principal stress field and fault zone, and the range and degree of geostress disturbance caused by different types of fault zones are different, among which the range of geostress disturbance is mainly affected by fault strike and fault length.ConclusionsBased on the research on the characteristics of geostress field, this paper clarifies the distribution characteristics and disturbance law of geostress size and direction in Dingbei area, discusses the disturbance mechanism of different genetic fault zones on geostress size, and establishes a prediction model for the disturbance width of geostress direction in the research area, which has important reference value for subsequent well pattern deployment and fracturing reconstruction.

       

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