二连盆地吉尔嘎朗图凹陷煤层气储层特征及勘探潜力

发布时间：2018-05-05 15:01

本文选题：吉尔嘎朗图凹陷 + 下白垩统　；参考：《煤田地质与勘探》2017年04期

【摘要】：通过分析二连盆地吉尔嘎朗图凹陷煤层的煤厚分布、煤岩煤质、孔隙、等温吸附等特征,并从生气条件和保存条件方面分析其勘探潜力。结果表明,吉尔嘎朗图凹陷煤层厚度10~394 m,显微煤岩组分以腐植组为主(体积分数为80.5%~96.7%),为低煤级褐煤;煤层Langmuir体积为3.55~10.88 m~3/t,平均7.29 m~3/t;煤孔隙结构以微孔和小孔为主,孔隙形态多为开放型的圆筒孔或平板孔,这类孔隙结构对煤层气的吸附能力强,煤层气含量为0.97~3.83 m~3/t,平均2.08 m~3/t。综合以上分析认为,研究区东南部为下一步煤层气勘探目标区,其优势特征为:煤层离正断层较远,煤层气不易散失;煤层顶板岩性以泥岩和粉砂质泥岩为主,有利于煤层气的保存、次生生物气的补给。
[Abstract]:By analyzing the coal thickness distribution, coal quality, porosity, isothermal adsorption and other characteristics of coal seam in Guilanglangtu depression, Erlian Basin, the exploration potential is analyzed in terms of gas generation conditions and preservation conditions. The results show that the thickness of coal seam in Gilgalangtu depression is 10 ~ 394m, the micronite composition is mainly saprophytic group (volume fraction is 80.5%, 96.7m), the coal bed is lignite of low rank, Langmuir volume of coal seam is 3.55 ~ 10.88mt / t, the average is 7.29 mm3 / t, the pore structure of coal is mainly micropore and pore, The pore morphology is mostly open cylinder or flat pore. This kind of pore structure has strong adsorption ability to coal bed gas, the content of coal bed gas is 0.97 ~ 3.83 mm ~ 3 / t, with an average of 2.08 m ~ (3 / t) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1). According to the above analysis, the southeastern part of the study area is the next target area for coalbed methane exploration, and its advantages are as follows: the coal seam is far from normal fault, the coal bed methane is not easy to be lost, and the coal seam roof lithology is dominated by mudstone and silty mudstone. It is beneficial to the preservation of coalbed methane and the recharge of secondary biogas.
【作者单位】：中国矿业大学(北京)地球科学与测绘工程学院;中国石油勘探开发研究院廊坊分院;华北油田公司勘探开发研究院;
【基金】：国家科技重大专项课题(2016ZX05041-004) 中国地质调查局科研项目(1212011220794)~~
【分类号】：P618.13

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