The coal structure factors change the morphology and thickne
Date:2013-11-26 Hits:
There are many reasons state and thickness variation of coal seams, from a structural aspect. Basement uneven settlement, such as the basement fault block differential settlement, synsedimentary folds and faults, through the control of sedimentary environment, can have a profound effect on coal seam shape and variation of coal seam.
(1) the basal faults control the seam zone
The late Mesozoic fault depression in the Northeast China coal accumulating basin are mostly asymmetric half graben system. The basin margin side often developed normal fault, is to control the formation and evolution of sedimentary basin of the main basement fault. The basement of the basin is often strike and transverse faults, forming a base fracture network. Therefore, the coal bearing strata in the process of the formation of uneven, control the distribution and evolution of sedimentary environment of the subsidence of the basement fault block, the form of coal seam and coal seam thickness shows a belt and along the strike of the partition points along the tendency.
(2) the change of coal thickness secondary uplift and depression basin caused by
Coal accumulation basin often develops secondary uplift and depression, or secondary synsedimentary folds, they have different effects on the control the morphology and thickness of coal seam. Due to the different states the structural differentiation and deposition between compensation, and development status of coal seam are also various. Under normal circumstances, the secondary uplift, the basin synsedimentary anticline form water shallow water zone in the basin, marsh development continued, appear thick coal seam or coal seam with coalescence, bifurcation, the depression part pointed out, but also can appear the opposite, namely secondary depression within parts of the basin, limnetic facies development continued, the uplift and alluvial facies, and discontinuous frequent sequence.
(3) the basin synsedimentary faulting caused by the change of coal thickness
Coal accumulating basin synsedimentary fault activity can cause coal bearing strata thickness and facies of significant changes, lead to mutant form of coal seam and the thickness of the. The most favorable area accumulation in peat, can form a thick coal zones. Thick coal zones along the strike of the fault extends across the fault, is rapidly thinning, bifurcation or pinch. Due to the continuous generation of fault, peat layer formed by cutting, two disc, thickness of coal seam position to butt.
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