黄陇侏罗纪煤田控煤构造研究

A Study on Coal-control Structure in Huangling-Longxian Jurassic Coalfield

陕西省黄陇侏罗纪煤田位于鄂尔多斯凹陷盆地南缘,煤田中东部地区北东-东西向褶皱发育,西部地区北西向断裂发育。受三叠系古地形影响,富县组起到填平补齐的作用;煤田内发育的褶皱不同程度控制了成煤期延安组的沉积和赋存状况,背斜古隆起处延安组沉积薄,含煤性差,向斜古洼地处延安组沉积厚,含煤性好;成煤后在区域构造背景下,盆地一度抬升,煤田东、南部含煤地层遭受剥蚀,西部发育的后期断裂构造破坏了煤层连续性。综合分析认为,煤田主要受成煤期同沉积构造控制,依据煤层赋存规律与控煤构造的关系,预测在永陇矿区陇县东部-千阳北部、陇县南-千阳一带为找煤有利区。

The Huangling-Longxian coalfield in Shaanxi Province is situated on the south margin of the Ordos down-warped basin.NE-EW folds are well developed in the middle and eastern parts of the coalfield,while NW faults in the western part.Conditioned by Triassic paleotopography,the Fuxian Formation deposit has played a role of filling and leveling up.Folds in the coalfield have controlled deposition and preservation of the Yanan formation during the coal-forming period： thin and poor coal-bearing properties in anticlinal paleodoming area;thick and good coal-bearing properties in synclinal paleodepression area.Under the tectonic setting after the coal-forming,the basin has elevated for a time,coal-bearing strata in eastern and southern parts of the coalfield exposed to erosion,while succeeding developed faulted structures destructed coal seam continuity in western part of coalfield.The comprehensive analysis has considered that： the coalfield has mainly controlled by synsedimentary structures during the coal-forming period,according to the relation between coal seam hosting pattern and coal-control structure,coal looking favorable areas of eastern Longxian to northern Qianyang,southern Longxian to Qianyang in the Yongshou-Longxian mining area have been predicted.