新疆米东区块位于准噶尔盆地南缘博格达山山前冲断带，地层高陡，构造复杂。当前，天然裂缝、现今地应力特征及其对工程的影响认识不清，制约煤层气高效开发。为阐明米东区块高陡煤系天然裂缝、现今地应力特征及其对工程的影响，研究通过4口取心井岩心观察天然裂缝特征和明确裂缝类型，进一步应用Stereonet软件统计了M2井成像测井裂缝产状分布规律；对褶皱轴迹的构造分析和统计M2井诱导缝走向分别揭示了北单斜、八道湾向斜局部现今最大水平主应力方向，运用4口井注入−压降试井参数计算现今地应力大小。通过微地震监测、微破裂向量扫描揭示位于八道湾向斜的M8、M9井和位于北单斜的M10、M11井煤层压裂缝延伸方位。结果表明，层理缝/弱面、煤岩割理、剪切滑移缝是高陡煤系中最主要的3种天然裂缝类型。其中层理缝/弱面在NNW向挤压的地层抬升过程中极易活化，M2井成像测井揭示八道湾组向斜核部层理缝/弱面广泛发育，其产状与地层产状具有一致性；八道湾向斜−七道湾背斜、北单斜现今地应力场具有明显的分区特征，靠近北单斜的七道湾背斜轴迹的垂直方向指示北单斜现今最大水平主应力方向沿NNW向；M2井NEE诱导缝走向表明八道湾向斜核部现今最大水平主应力方向沿NEE向，反映向斜局部受控于中性面以下拉张应力场。北单斜由浅至深(492～1135 m)水平地应力始终大于垂向地应力，表现为为以挤压作用为主的走滑断层地应力状态；八道湾向斜−七道湾背斜由浅至深(524～784 m)从走滑断层地应力状态过渡为正断层地应力状态。微地震监测和微破裂向量扫描揭示M8、M9、M10、M11井压裂缝沿NEE走向煤层延伸。在现今应力场背景下，高陡煤层的层理缝/弱面的普遍存在使压裂中易诱发套管变形、影响井壁稳定性，特别对煤层压裂缝延伸具有显著诱导作用，使压裂缝的主延伸方向与煤层产状一致，导致煤层沿非层理方向的改造程度不足。考虑压裂液黏度−排量对传递应力的影响，提高压裂液不同黏度和排量，对比压裂改造效果和产量值得进一步实践。

The Midong area in Xinjiang is located in the foreland thrust belt of Bogda Mountain on the southern margin of Junggar Basin, with high and steep strata and complex structures. At present, the characteristics of natural fractures and the current in-situ stress and their influence on engineering are unclear, which restricts the efficient development of coalbed methane. To clarify the characteristics of natural fractures and the current in-situ stress in high-steep coal-bearing strata and their influence on engineering, fracture characteristics and types were first observed in cores from four wells. Fracture occurrences are further counted from imaging logging of well M2 by Stereonet software. Analyzing the fold axis and counting strikes of induced fractures in well M2 from image logging, we describe the current maximum horizontal principal stress direction of the north monocline and the Badaowan syncline, respectively. Parameters measured from injection/falloff tests of four wells are used to calculate magnitudes of the current in-situ stress. Through micro-seismic monitoring and vector scanning for microseismic, the extension direction of coal seam fractures in M8 and M9 wells located in the Badaowan syncline and M10 and M11 wells located in the northern monocline is reflected. The results show that bedding fractures/weak planes, cleats in coal, and shear fractures are the three main types of natural fractures in high-steep coal-bearing strata. Among them, bedding fractures/weak planes are easily activated during strata uplifts under NNW compression. Imaging logging reveals that bedding fractures/weak planes are widely developed in the syncline core of the Badaowan Formation, and their occurrences are consistent with those of strata. Current in-situ stress fields of the Badaowan syncline-Qidaowan anticline and the north monocline are obviously different. Near the north monocline, vertical directions to the Qidaowan anticline axis indicate that the current maximum horizontal principal stress direction of the north monocline is nearly along the NNW direction. NEE-trending induced fractures suggest that the direction of the maximum horizontal principal stress in the core of the Badaowan syncline is along the NEE direction, reflecting that the syncline is locally controlled by the tensile stress field below the neutral surface. In the northern monocline, from shallow to deep (492–1135 m), horizontal principal stresses are always greater than vertical principal stresses, showing a strike faulting stress state dominated by compression. In the Badaowan syncline-Qidaowan anticline, from shallow to deep (524–784 m), the strike faulting stress state transits into the normal faulting stress state. Microseismic monitoring and vector scanning for microseismic reveal that the hydraulic fractures of M8, M9, M10, and M11 wells extend along the NEE-trending coal seam. Under the background of the current stress field, steep bedding fractures/weak planes tend to induce casing deformation during hydraulic fracturing, and they affect wellbore stability. In particular, bedding fractures/weak planes have a significant induction effect on the extension of hydraulic fractures in coal seams. Consequently, the main extension direction of hydraulic fractures is consistent with the occurrence of coal seams, which means limited stimulation of coal seams. Considering the influence of fracturing fluid viscosity and displacement on stress transfer, it is worth further practice to improve different viscosities and displacements of fracturing fluids and compare the fracturing effect and production.