Seismic Prediction Method Research On K₁y-K₁l Formation Sandstone Binchang Mining Area

Binchang mining area is one of the 14 coal bases in china, the Cretaceous K1y-K1l bearing sandstone is widely distributed in the mine,the J1y coal seam often communicate K1y-K1l formation sandstone, will directly increase the amount of water.The mine often suffer the roof water threat, seriously threaten the mine construction and safety.Whether the coal can communicate with the sandstone, depending on the height of water flowing fractured zone and the distance between coal seam and the formation sandstone aquifer. Figuring out the thickness of the formation sandstone aquifer and the distance between coal seam and the the formation sandstone aquifer is very important, K1y-K1l seismic reflection is affected by thick loess area energy absorption, resulting in K1y-K1l formation reflected wave characteristic of weak, is difficult to continuously track, how to enhance the bottom of the K1y-K1l reflection wave, improve the continuity of the bottom of the K1y-K1l reflection wave, become sand body prediction of the key. This paper focus this study, using seismic inversion method, describe the the internal structure of K1y-K1l.This paper analysis the K1y-K1l physical characteristic and distribution in the mining,comparative analysis binchang mining Xiaozhuang、Gaojiabao、 Yangjiaping、Dafosi、Mengcun mine previous seismic data and the same seismic data in a different way to deal with K1y-K1l formation at the bottom of the interface reflection wave of the strength of the relationship. Conclude that bedrock area K1y-K1l formation reflected strong,loess layer covering reflected weak,for coal layer processing will weaken K1y-K1l formation reflection; comparative analysis the reflection wave characteristics of different thickness of coal seam; summarized the correlation between the thickness of the coal and the elevation of the floor; analyzed the factors which influence K1y-K1l reflection quality, put forward to the technical measures which improve the K1y-K1l bottom reflection.The weaking reflection energy compensation, Genozoic strong reflected wave weakening processing, can significantly improve the K1y-K1l group of top and bottom interfaces and internal reflection wave energy and quality.using the target processing in the sand body the reflected wave energy and continuity can be obviously improved;making seismic modeling of the variation in the thickness of sandbody、mining area stratum structure, thin sand body thickness changes, the distance change between K1y-K1l bottom with coal seam to analysis seismic reflection wave characteristics; studying the explanation and prediction methods on thick layer and thin layer sand body, Sparse pulse inversion can inversion K1y-K1l distribuion inside the sand structure; in binchang SEB mine as an example, explain the thickness of the sandstone and the distance between coal and sandstone, inverted the inner structure of the K1y-K1l, which achieved a good goals.