煤田地质与勘探2017，Vol.45Issue(4)：63-69,7.DOI:10.3969/j.issn.1001-1986.2017.04.011
二连盆地吉尔嘎朗图凹陷煤层气储层特征及勘探潜力
Characteristics of CBM reservoirs and exploration potential in Jiergalangtu sag of Erlian basin
摘要
Abstract
The coal seams distribution,petrographic characteristics and coal qualities,pore characteristics,and isothermal adsorption features of coal seams in Jiergalangtu sag of Erlian basin were analyzed.The exploration potential of CBM was predicted from the aspects of CBM generation and preservation conditions.It was considered that the coal seams in this sag are at a stage of low-rank of lignite with a thickness of 10～394 m and coal macerals are dominated by huminite with a volume fraction of 80.5％～96.7％.Langmuir volumes are high,ranging of 3.55～10.88 m3/t with a average of 7.29 m3/t.Pore structures are dominated by micropores and small pores,with the open cylindrical pore or parallel-plate pore morphologies,which provides a favorable condition for CBM desorption.Then the gas content of the coal seams in this area was tested to be from 0.97 to 3.83 m3/t with a average of 2.08 m3/t.The exploration potential of the sag is comprehensively evaluated and the target areas of CBM exploration in the future are the southeast of the sag.There are three advantages.①Coal seams are away from normal faults and CBM is not easy to escape.②The roof lithologies of coal seams are mainly mudstone and silty mudstone,which are beneficial to the preservation of CBM.③There is the supply of secondary biogenic gas.关键词
吉尔嘎朗图凹陷/下白垩统/低煤级/煤层气/储层特征/勘探潜力Key words
Jiergalangtu sag/Lower Cretaceous/low coal rank/CBM/characteristics of reservoirs/exploration potential分类
天文与地球科学引用本文复制引用
王帅,邵龙义,孙钦平,侯海海,高双,鲁静,孙斌..二连盆地吉尔嘎朗图凹陷煤层气储层特征及勘探潜力[J].煤田地质与勘探,2017,45(4):63-69,7.基金项目
国家科技重大专项课题(2016ZX05041-004) （2016ZX05041-004）
中国地质调查局科研项目(1212011220794)National Science and Technology Major Project(2016ZX05041-004) （1212011220794）
China Geological Survey Scientific Research Project (1212011220794) （1212011220794）
