On Late Permian Coal-accumulating Environment and Coal-forming Patterns in Diandong Coalfield;

Discussion on Late Permian coal-accumulating environment and its coal-forming pattern in Laochang coalfield,eastern Yunnan Province,China;

Neutron activation analysis(NAA)was adopted to determine rare earth elements(REE)content in Jurassic Yanan Formation coals in Dongsheng coalfield,then drawing REE distribution pattern curves and calculating multiple chemical parameters.

The Yanan Formation coal-bearing strata in Ulan Xil district,Dongsheng coalfield possess many coal seams,thickness and intervals between coal seams varying largely,coal seam splitting and merging frequently,thus hard to correlate coal seams and strata.

Research on gas controlling by tectonism of center and the south of Hedong coalfield;

This paper deals with the coal-bearing measures of the Taiyuan Formation (C2) in the Fugu - Baode mine of the Hedong coalfield (the Northwest China) on the basis of the sedimentary characteristics of a main sandstone body (the Qiaotou sandstone body), including its mineralogy, petrology, textures, sedimentary structures, paleocurrents and spatial geometry.

The authors discover, in the Carboniferous-Permian coal reservoir in Hedong coalfield, Shanxi Province, two groups of joints similar to the traditional exo_joints in scale and to the cleat in occurrence, joint feature, growth carrier and other features.

Application of guide-rod drill string in exploration hole of Dongliang Coal Field in Fuxin;