顺和西煤矿区地温特征及其影响因素分析

Geotemperature Characteristics and Impacts from Geological Factors in Shunhexi Mine Area

顺和西煤矿区属华北地台型含煤沉积、石炭、二叠系为其主要含煤地层,山西组的二2煤层为主采煤层,埋深585～1 585m。由于永城隐伏背斜两翼发育的次级宽缓褶曲及其高角度断层,控制着本区含煤地层的分布,故该矿区的地温亦受各种地质因素的作用与控制,表现为同一水平地层越老温度越高,背斜轴部地温和增温率均高于向斜轴部;中北部地温梯度较高,增温异常;南部、东北局部地温梯度较低,增温正常;地温梯度随深度的增加而减小,并在岩浆侵入地段与非侵入地段也有明显差异。地温随深度或煤层埋深的增大而增高。二2煤层除局部较浅地段为一级热害区外,二级热害区基本覆盖全区。

The Shunhexi coahnine area is a North China platform typed coal deposit. Main coal-beating strata belong to Carboniferous and Permian systems, the coal II2 is the main mineable seam, buried depth 585m-1585m. Because of secondary broad and gentle folds and high-angle faults developed in two limbs of the Yongeheng buffed anticline have controlled coal-beating strata distribution in the area, thus the area＇s geotemperature also controlled by various geological factors. Therefore appear as the older the strata, the higher the temperature at a same level; the geotemperature and geothermal gradient in anticlinal axis are all higher than that in synelinal axis. Geothermal gradient is higher in mid-north part with abnormal temperature increasing; and lower in south part and local northeast part with normal temperature increasing. Geothermal gradient decreasing along with depth increasing, and has obvious difference between magmatic intrusion sector and non-magmatie intrusion sector. Geotemperature is increasing along with the increasing of depth or coal seam buried depth. Except local shallower sector of the coal I12 belongs to thermal damage category I, while the category II basically covered whole area.