利用地震相变化推测地质演化规律

Speculation upon Geological Regular Evolution through Seismic Facies Variation

蔚县矿区是一个中生代赋煤区,通过对单侯矿区西南翼三维地震数据体的认识,认为该区煤层基底为寒武系、奥陶系下统,受海西期与印支期抬升作用的影响,缺失了中奥陶统至三叠系。煤层的基底隆起形成于印支期,即使在接受成煤沉积的燕山期,基底仍处于不均匀的抬升状态。成煤期间,由于盆地基底抬升或沉降幅度不均衡,导致了蔚县整个含煤盆地内部沉积厚度发生变化,造成隆起部位煤层变薄及缺失。后期随着抬升的延续,结束了该区含煤建造过程。

The Yuxian mining area is a Mesozoic coal-bearing area, according to 3D seismic data volume from the southwestern Shanhou mine area, considered that the basement of coal measures belongs to Cambrian and lower Ordovician, because of Hercynian and Indosini- an uplift causing the absence of strata from middle Ordovician through to Triassic. Uplift of coal measures basement date from the Indo- Chinese epoch, even if during the Yanshanian coal-forming stage, the basement still under a non uniform uplift situation. During the coal-forming stage, since the disequilibrium basement uplift or subsidence range, causing the sediment thickness within the whole Yux- Jan coal-bearing basin varied, contributed to coal seam thinning or hiatus in uplift part. Afterwards, along with the uplift continuing, the coal-bearing formation process wind-up.