鄂尔多斯盆地东缘MG区块煤层裂缝发育多尺度预测

查明煤层裂缝的发育特征,对于煤层气开采及井下煤矿安全生产都具有重要意义.测井及地震是煤层裂缝的地球物理识别的有效手段,针对鄂尔多斯盆地东缘MG区块,利用电成像、电阻率、密度、声波时差、自然伽马、中子孔隙度和阵列声波等测井曲线对8+9号的煤层小尺度裂缝的地球物理响应进行了描述;利用OVT(Offset Vector Ti...

Multi-scale prediction of coal seam fracture development in MG block,eastern margin of Ordos Basin

Finding out the development characteristics of coal seam fractures is of great significance for coalbed methane exploitation and safe production of underground coal mines. Logging and seismic are effective means of geophysical identification of coal seam fractures. Electrical imaging, resistivity, density, sonic differential time, natural gamma, neutron porosity and array acoustic logs are used to describe the small scale fracture morphology of No.8 and No.9 coal seams of MG block in the eastern margin of Ordos Basin. The middle-scale fracture of No.8 and No.9 coal seams was predicted by prestack Azimuth AVO inversion in OVT domain. And the large-scale fracture distribution of No.8 and No.9 coal seams in the study area was described in detail based on the poststack seismic intrinsic coherence, coherent enhancement attribute and fracture simulation attribute. According to the post-stack seismic data and pre-stack inversion analysis, the fractures of No.8 and No.9 coal seams in the study area developed two groups of NW and NNE trending fractures. This work has established a multi-scale geophysical prediction method of coal seam fractures from micro to macro, which will provide important geological basis for coalbed methane exploration selection and coal seam safety mining in the study area.