呼和诺尔盆地伊敏组含煤特征分析

Coal-bearing Characteristic Analysis of Yimin Formation in Hohnur Basin, Inner Mongolia

呼和诺尔盆地属海拉尔盆地群,为张性盆地,区域性的北东向断裂控制了盆地的形态和规模。盆地主要含煤地层为下白垩统伊敏组,发育11个煤组,其中4煤组、8煤组煤层较稳定,全区大部可采;11煤组煤层稳定,厚度达15～20m,为全区主要可采煤层。根据伊敏组含煤地层沉积特征,,划分了四个沉积旋回,分析了影响煤层沉积的主要因素,认为盆地沉积明显受同沉积断层的控制,表现在断层两盘岩层生长指数和沉积特征均有明显的差异。本次研究将对海拉尔盆地乃至相邻蒙古国盆地的煤田勘查提供借鉴。

The Hohnur Basin is one of basins in the Hailar basin group and a tensional basin, regional NE faults controlled configuration and scope of the basin. Main coal-bearing strata belong to the Yimin Formation and total 11 coal groups have been developed. In which, Nos.4 and 8 coal groups are rather stable, mostly mineable in whole area; No.11 coal group is stable, 15-20m thick, the main mineable coal seam in whole area. Through the research on coal accumulating pattern of the coal-bearing strata in Yimin Formation, analyzed main factors impacting coal seam deposition, four sedimentary cycles were divided. The analysis considered that the basin has controlled by synsedimentary faulting obviously, found expression in distinct differences of growth indices and sedimentary characters of strata of both fault walls. The study will provide references for coal exploration in whole Hailar basin group as well as basins in the neighboring Mongol Uls.