摘要
准噶尔盆地南缘四棵树凹陷高探1井的中生界油气勘探已获得重大突破,深入解析该地区深层致密砂岩的构造变形显得至关重要。综合野外、岩心、测井和地震等数据,利用地质调查与有限元数值模拟方法查明了四棵树凹陷的构造应力环境,明确了构造应力场对构造变形的控制作用。研究表明,四棵树凹陷现今的最大水平主应力总体呈SN向,具有分带性。在北天山西段、托斯台构造带和高泉构造带等地区,最大水平主应力方位呈NNW向;在艾卡构造带和车排子凸起等地区,最大水平主应力方位呈NNE向或NE向。晚喜马拉雅期以来,NNW向构造应力由北天山地区向四棵树凹陷内部逐渐传递,受其控制的凹陷内构造变形也沿NNW向传播扩展。高泉背斜清水河组的构造应力场数值模拟表明:研究区的最大水平主应力为80~170 MPa;构造应力在背斜南部、中部的断层附近集中,向北则减小;近EW走向断层附近的构造应力明显大于NNW(或近SN)走向断层附近的构造应力,总体显示高泉背斜处于压扭应力环境。构造应力场控制了高泉背斜的裂缝发育和展布,裂缝走向与最大水平主应力方向一致或呈小角度相交,且断层附近或背斜核部裂缝较发育。高探1井中发育的构造裂缝可能是该井取得高产的重要原因之一。
A great breakthough has been achieved in Mesozoic hydrocarbon exploration in Well Gaotan1 of Sikeshu sag in the southwest Junggar Basin,and it is crucial to further investigate the tectonic deformation of deep tight sandstone in this area.Based on the data of outcrop,core,logging and earthquake,and the comprehensive use of geological survey and numerical simulation methods,this paper makes clear the tectonic stress field of Sikeshu sag and its control on deep tectonic deformation.The research shows that the azimuth of maximum horizontal principal stress in Sikeshu sag is generally NS-trending with a zonal distribution.The azimuth of maximum horizontal principal stress shows NNW-trending in the western part of North Tianshan Mountain,Tuositai and Gaoquan tectonic belts,but NNE or NE-trending in the Aika tectonic belt and Chepaizi uplift.Since the Late Himalayan period,the NNW-trending tectonic stress has gradually transferred from the North Tianshan to the Sikeshu sag,and the tectonic deformation controlled by the stress also propagates along the NNW direction.According to numerical simulation of the tectonic stress field of Qingshuihe Formation in Gaoquan anticline,the maximum horizontal principal stress ranges from 80 MPa to 170 MPa in the study area.The stress is concentrated near the southern and central faults and decreased to the northern part.The maximum principal stress of EW-trending faults is significantly greater than that of NNW or NS-trending faults,indicating that the Gaoquan anticline is under the transpressional stress environment.The tectonic stress field controls the development of fractures.The strike of fracture is consistent with the azimuth of the maximum horizontal principal stress,or intersects with it at a small angle.Structural fractures are more developed near the fault or in the core of anticline.Therefore,the structural fractures in Well Gaotan1 may be one of the important factors for the high oil and gas production.
作者
吴林
朱明
冯兴强
冀冬生
周磊
刘圣鑫
张林炎
谭元隆
钱竹良
杨珍
Wu Lin;Zhu Ming;Feng Xingqiang;Ji Dongsheng;Zhou Lei;Liu Shengxin;Zhang Linyan;Tan Yuanlong;Qian Zhuliang;Yang Zhen(China Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;Key Laboratory of Paleomagnetism and Paleotectonic Reconstruction,Ministry of Natural resources,Beijing 100081,China;Key Laboratory of Petroleum Geomechanics,China Geological Survey,Beijing 100081,China;Research Institute of Exploration and Development,PetroChina Xinjiang Oilfield Company,Xinjiang Urumqi 830013,China;Shixi Field Operation District,PetroChina Xinjiang Oilfield Company,Xinjiang Karamay 834000,China)
出处
《石油学报》
EI
CAS
CSCD
北大核心
2022年第4期494-506,共13页
Acta Petrolei Sinica
基金
国家自然科学基金项目(NO.41902158)资助。
关键词
构造应力场
构造变形
裂缝
有限元数值模拟
四棵树凹陷
准噶尔盆地
tectonic stress field
tectonic deformation
fracture
finite element numerical simulation
Sikeshu sag
Junggar Basin
