现今地应力对富有机质页岩断层封闭性的研究——以川东南丁山地区龙马溪组为例
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摘要
断层的封闭性研究对油气藏的保存、评价工作及探索油气的分布规律具有重要的参考价值与指导意义。以川东南丁山地区龙马溪组页岩为例,利用FMI成像测井、震源机制解、现场水力压裂、三轴力学实验、有限元2D-σ方法等技术与方法分别对其现今地应力的方向、大小及岩石力学性质进行了分析,最后对井位附近断层封闭性进行了初步的评价。结果表明:丁山地区龙马溪组页岩现今地应力方向总体处于北东东—南西西(55°±5°)至南东东—北西西(110±5°)范围。DY2井龙马溪组页岩层现今最大主应力约145.0 MPa,断层面叠合正应力约188.4~218.3 MPa,岩石处于塑性变形阶段,破裂模式较为单一,脆性指数约41.6%~49.0%,破裂系数约0.197~0.355,断层封闭性总体较好,含气性与试气效果较好。DY1井龙马溪组页岩层现今最大主应力约52.0 MPa,断层面叠合正应力约75.8~83.1 MPa,岩石处于弹性变形阶段,破裂模式较为复杂,脆性指数约48.5%~55.0%,破裂系数约0.355~0.671,断层封闭性总体较差,含气性与试气效果较差。DY3井和DY4井龙马溪组附近断层封闭性一般。
The study of fault sealing has important reference value and guiding significance for the preservation and evaluation of oil and gas reservoirs and exploration of the distribution of oil and gas.Based on the technologies and methods of FMI imaging logging,focal mechanism solution,field hydraulic fracturing,triaxial mechanical experiment, finite element 2 D-σ method and so on, the direction,intensity of the present geostress and the rock mechanical properties of the Longmaxi Formation in Dingshan area were analyzed. The sealing property of faults near well location was evaluated preliminarily. The results show that the direction of the present ground stress is generally from NEE-SWW( 55° ± 5°) to SEE-NWW( 110° ± 5°). The maximum principal stress of the Longmaxi Formation is about 145. 0 MPa in the Well DY2,and the superimposed normal stress on the fault plane is about 188. 4 to 218. 3 MPa. The rock is in the plastic deformation stage with a simple fracture mode,generally good fault sealing,gas-bearing properties and test results,the brittleness index about 41. 6% to 49. 0% and the burst factor about 0. 197 to 0. 355. The present maximum principal stress of shale formation in the Longmaxi Formation of the Well DY1 is about 52. 0 MPa,and the superimposed normal stress of the fault plane is about 75. 8 to 83. 1 MPa. The rock in the Longmaxi Formation of the Well DY1 is in the elastic deformation stage with a more complex fracture mode,generally bad fault sealing,gas-bearing properties and test results,the Rickman brittleness index about 48. 5% to 55. 0% and the rock fracture coefficient about 0. 355 to 0. 671. The fault sealing near shale formation of the Longmaxi Formation in the well DY3 and the well DY4 are generally normal.
The study of fault sealing has important reference value and guiding significance for the preservation and evaluation of oil and gas reservoirs and exploration of the distribution of oil and gas.Based on the technologies and methods of FMI imaging logging,focal mechanism solution,field hydraulic fracturing,triaxial mechanical experiment, finite element 2 D-σ method and so on, the direction,intensity of the present geostress and the rock mechanical properties of the Longmaxi Formation in Dingshan area were analyzed. The sealing property of faults near well location was evaluated preliminarily. The results show that the direction of the present ground stress is generally from NEE-SWW( 55° ± 5°) to SEE-NWW( 110° ± 5°). The maximum principal stress of the Longmaxi Formation is about 145. 0 MPa in the Well DY2,and the superimposed normal stress on the fault plane is about 188. 4 to 218. 3 MPa. The rock is in the plastic deformation stage with a simple fracture mode,generally good fault sealing,gas-bearing properties and test results,the brittleness index about 41. 6% to 49. 0% and the burst factor about 0. 197 to 0. 355. The present maximum principal stress of shale formation in the Longmaxi Formation of the Well DY1 is about 52. 0 MPa,and the superimposed normal stress of the fault plane is about 75. 8 to 83. 1 MPa. The rock in the Longmaxi Formation of the Well DY1 is in the elastic deformation stage with a more complex fracture mode,generally bad fault sealing,gas-bearing properties and test results,the Rickman brittleness index about 48. 5% to 55. 0% and the rock fracture coefficient about 0. 355 to 0. 671. The fault sealing near shale formation of the Longmaxi Formation in the well DY3 and the well DY4 are generally normal.
引文
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