Fine Logging Evaluation Of Jurassic Coal Seam In YH Well Field Of Jiaoping Mining Area

Jiaoping mining area in the south of Ordos is an important contribution area of coal resources in Weibei.It is of great economic significance to stabilize and increase coal production.In order to effectively play the role of coalfield logging in coalfield geological exploration.Supplementary geological exploration for the YH well field,It is urgent to carry out fine logging evaluation of Jurassic coal seam in YH well field of Jiaoping mining area.This paper is based on the geological data,drilling data and logging data of YH well field.Firstly,the stratigraphic division and correlation of the study area are completed by using the characteristics of the study area marker and auxiliary marker.Then,based on the statistical characteristics analysis of typical lithology logging response in the study area,the lithology identification chart is summarized and established.Then,the sedimentary cycle characteristics of the target layer and the structural characteristics of coal seam are studied.Based on core test data,well logging data,etc.The volume model and probability model of coal seam logging interpretation are constructed respectively.Logging interpretation of coal quality is carried out by selecting statistical model.Establish log interpretation model of coal and rock mechanics parameters.Study on rock mechanical parameters of coal seam roof and floor in this area.Finally,4-2 coal classification evaluation was carried out based on coal quality parameters,coal thickness,rock mechanics parameters of coal seam roof and floor.Studies have shown that.The structural characteristics of the top of Yan ’an Formation in YH well field are "saddle shape".Along the northeast and southwest direction is the lower part of "saddle" structure.Tectonic uplift to northwest and southeast.The structural isolines at the bottom of Yan ’an Formation appear to be open to the east.Lift from the center to the south,west and north.The lowest part of 4-2 coal roof is located in the middle of the study area.Gradually rise in all directions.Natural gamma ray logging and density logging can be used for lithology identification,and density curve is the most sensitive,Resistivity logs can effectively distinguish coal seams from other lithologies.The sedimentary environment in the early Yan ’an Formation is favorable to the formation of coal,4-2 coal was mainly formed in the early Yan ’an Formation.The sedimentary environment in the late Yan ’an Formation is not conducive to the formation of coal.Based on the test data of 17 coal and rock industrial components from 15 Wells in this area,the coal and rock industrial components statistical method was established.And it is compared with the rock volume physical model.The industrial component statistical model of 4-2 coal is preferred.Logging interpretation of rock mechanics parameters of coal seam roof and floor shows.The consistency of isoline trend of Young’s modulus and volume modulus of the roof of 4-2 coal seam in the study area is good.It is the largest in the southwest of the study area,and gradually decreases in the northwest and southwest directions.It nosed down to the northeast.The compressive and tensile strength of coal seam roof is high in the southeast of the study area.The value decreases along the southwest to northeast direction.The overall distribution is "saddle shape".The results were interpreted based on industrial components and strength parameters.The classification and evaluation of coal seams in the study area are carried out by means of cluster analysis.The plane distribution characteristics of three types of coals in the study area are obtained.