河北省宣化东部煤系地层综合气含气性评价  

Comprehensive gas content evaluation of coal bearing strata in Eastern Xuanhua,Hebei

作　　者：李正 LI Zheng(Hebei Provincial Coalfield Geological Exploration Institute,Xingtai,Hebei 054000,China;Hebei Unconventional Natural Gas Exploration and Research Center,Xingtai,Hebei 054000,China)

机构地区：[1]河北省煤田地质勘查院 [2]河北省非常规天然气勘查研究中心

出　　处：《录井工程》2024年第2期125-131,共7页Mud Logging Engineering

基　　金：河北省地质勘查专项资金项目“河北省张家口市宣化东部地区页岩气资源潜力调查评价”(编号:343-0402-YQN-U6LS)。

摘　　要：通过对河北省宣化东部施工的ZY 1井的地层岩性发育特征、气测录井、含气量测定以及等温吸附试验、气体组分及甲烷碳同位素测试数据分析,对该区煤系地层综合气含气性进行评价,最终证实:该区青白口系下马岭组、中-下侏罗统下花园组地层中发育多段垂向空间叠置特征明显的暗色泥页岩、煤、致密砂岩沉积地层;气测录井发现气测异常层8层,均存在于下花园组地层中;含气量测定数据显示泥页岩层总含气量介于1.10~8.30 m^(3)/t之间,平均值3.60 m^(3)/t,煤层总含气量介于2.78~14.80 m^(3)/t之间,平均值7.17 m^(3)/t;等温吸附实验显示泥页岩兰氏体积介于3.33~6.49 cm^(3)/g之间,平均值4.78 cm^(3)/g,煤层兰氏体积介于12.29~21.67 cm^(3)/g之间,平均值17.75 cm^(3)/g;气体化学组分以甲烷为主,平均值91.27%。通过分析气体甲烷碳同位素测试数据认为,该区气成因复杂,热成因、生物成因、次生热成因均存在。综合分析,该区具有较大的煤系地层综合气资源勘探潜力。By analyzing the gas logging,geological logging,gas content measurement,and isothermal adsorption test data of Zhangye 1 well constructed in the eastern part of Xuanhua,Hebei Province,the comprehensive gas⁃bearing properties of the coal bearing strata in the area is evaluated.Finally,it is confirmed that there are multiple layer,thin layers,and obvious vertical spatial stacking characteristics of dark shale,coal seams,and dense sandstone sedimentary strata in the Xiamaling Formation of the Qingbaikou System and Xiahuayuan Formation of Middle⁃lower Jurassic System in the area.Gas logging reveals 8 abnormal gas layers,all present in the Xiahuayuan Formation.Gas content data shows that the total gas content of the shale layer is between 1.10 m^(3)/t⁃8.30 m^(3)/t,with an average of 3.60 m^(3)/t,and the total gas content of the coal seam was between 2.78⁃14.80 cm^(3)/t,with an average of 7.17 cm^(3)/t.Isothermal adsorption experiments shows that the Langmuir volume of the shale is between 3.33⁃6.49 cm^(3)/g,with an average of 4.78 cm^(3)/g,and the Langmuir volume of the coal seam is between 12.29⁃21.67 cm^(3)/g,with an average of 17.75 cm^(3)/g.The gas chemical composition is mainly methane.Through methane isotope analysis of coalbed methane,it is shown that the genesis of coalbed methane in this area is complex,including thermal,biogenic,and secondary thermal genesis.It shows that the area has good comprehensive gas⁃bearing properties in coal bearing strata.

关 键 词：煤系地层 综合气 综合录井 含气量测定 等温吸附 气体组分 甲烷碳同位素 宣化东部 

分 类 号：TE132.1[石油与天然气工程—油气勘探]