1.CNOOC Research Institute Co.,Ltd.,Beijing ,China；2.Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing ,China

为分析S2C区块地应力剖面与平面分布特征，基于测井信息，建立了SZC区块地应力预测模型，分析了地应力剖面与平面分布特征。依据地应力与渗透率之间的相关性，研究了渗透率的平面差异性。结果表明，SZC区块中部，3号煤层埋深适中，最小水平主应力在12 MPa以下，煤储层地应力状态主要表现为σv >σH >σh；埋深处于740～1 100 m时，最小水平主应力为12～22 MPa，煤储层地应力状态表现为σH ≥σv。在侧压系数小于1.0的区域，煤层埋藏较浅，垂直主应力占主导地位，平均产气量在500 m3/d以上的井位占比为64.2%。渗透率随最小水平主应力的增加呈指数降低的趋势，区块中部煤层渗透率最高可达0.2×10-3μm2以上，平均产气量相对较高。

In order to analyze the cross section and plane distribution features of geostress in A Coalbed Methane Block, a prediction model was established based on the logging information.According to the relativity between the geostress and the permeability, the plane difference of the permeability was studied. The results showed that in the central part of A Block, the depth of No. 3 seam was moderate and the min horizontal principal stress was below 12 MPa. The geostress condition of the coal reservoir mainly was σv >σH>σh. When the seam depth was between 740～1 100 m, the min horizontal principal stress was 12～22 MPa and the geostress condition of the coal reservoir was σH ≥σv. When the lateral pressure coefficient was less than 1.0 in the area, the seam depth was shallow, the vertical principal stress was in a leading position and the well location ratio with an average gas production over 500 m3/d would be taken 64.2%. The permeability would be in an index reclined tendency with the min horizontal principal stress increased. A max value of the permeability in the central part of the Block could be over 0.2×10-3μm2 and the average gas production was relatively high.