西山区块煤储层含气性及甲烷碳同位素分布特征

发布时间：2018-06-04 23:41

  本文选题：西山区块 + 含气性　； 参考：《煤田地质与勘探》2017年01期

【摘要】：煤层含气性是决定煤层气勘探开发的重要参数,煤层气甲烷碳同位素能有效反映煤层气的赋存条件。根据煤层气井实测含气量数据,剖析了山西沁水盆地煤层含气量分布特征,建立了煤层含气量与煤层埋深、地质构造之间的相关关系和模型,探讨了煤层甲烷碳同位素分布特征及其对含气性分布的指示作用。研究表明:西山区块2号煤层平均含气量6.87 m~3/t,8号煤层平均含气量8.4 m~3/t,9号煤层平均含气量7.6 m3/t,煤层含气量主要受煤层埋深和构造形态的影响。研究区8号煤层甲烷碳同位素为 65.33‰~ 40.94‰,平均 45.88‰,煤层含气量与甲烷碳同位素之间成正相关关系,随着含气量的增加,甲烷碳同位素也逐渐变重。煤层甲烷碳同位素主要受控于煤层气解吸 扩散 运移效应和地下水动力作用等。
[Abstract]:The methane content of coal seam is an important parameter to determine the exploration and development of coalbed methane, and the methane carbon isotope can effectively reflect the condition of coalbed methane occurrence. Based on the measured gas content data of coalbed gas wells, the distribution characteristics of coal seam gas content in Qinshui Basin, Shanxi Province, are analyzed, and the correlation and model between coal seam gas content and coal bed depth and geological structure are established. The characteristics of methane carbon isotope distribution in coal seam and its indicative effect on gas-bearing distribution are discussed. The results show that the average gas content of No. 2 coal seam in Xishan area is 6.87 mm2 / t, that of No. 8 coal seam is 8.4 mm2 / 3 / t, and that of No. 9 coal seam is 7.6 m3 / t, and that the gas content of coal seam is mainly affected by the buried depth of coal seam and structural morphology. The methane carbon isotopes in No. 8 coal seam are 65.33 鈥，

本文编号：1979374