Clay minerals in the outcropped sandstone from Lower Cretaceous Chengzihe Formation and Muling Formation in Jixi Basin were analyzed by X-ray diffraction. The results show that the clay minerals mainly consist of illi...Clay minerals in the outcropped sandstone from Lower Cretaceous Chengzihe Formation and Muling Formation in Jixi Basin were analyzed by X-ray diffraction. The results show that the clay minerals mainly consist of illite, kaollinite and illite/smectite, which can be divided into two types： kaolinite- and illite/smectite types. The outcropped sandstone occurred in middle diagenetic stage-A on the basis of the clay mineral composition. The development factor of the formation of kaolinite type clay mineral is caused mainly by the organic acid from the coal-bearing formation and nmdstone during the diagenesis process in Lower Cretaceous Chengzihe Formation and Muling Formation in the Jixi Basin. The weak hydrodynamic force of sedimentary facies made the sandstone leaching condition poor, which is the reason forming the aggregation of clay minerals of the illite/ smectite-and illite types.展开更多
The sedimentary facies of Chengzihe and Muling formations of Early Cretaceous coal-bearing strata in Shuangyashan Basin were studied via petrography,grain-size analysis and borehole data analysis. Based on the sedimen...The sedimentary facies of Chengzihe and Muling formations of Early Cretaceous coal-bearing strata in Shuangyashan Basin were studied via petrography,grain-size analysis and borehole data analysis. Based on the sedimentary characteristics and temporal and spatial distribution of the sedimentary facies,sedimentary facies of the Early Cretaceous Chengzihe and Muling formations were mapped. The results suggest that fan delta and lacustrine are the major facies developed,which include fan delta plain,shallow lake and multi-layered marsh coal. For the period from the Chengzihe to the Muling Formation,the sedimentary basin expanded with lake basin migrating to the northeast. The period of the Chengzihe Formation represents a period of growth for delta plain deposits and coal accumulation,whereas Muling Formation represents the development of lacustrine deposits,consisting of mudstone and a few thin coal seams.展开更多
基金Supported by Project of Special Foundation for State Oilgas Research,China(XQ-2004-07)
文摘Clay minerals in the outcropped sandstone from Lower Cretaceous Chengzihe Formation and Muling Formation in Jixi Basin were analyzed by X-ray diffraction. The results show that the clay minerals mainly consist of illite, kaollinite and illite/smectite, which can be divided into two types： kaolinite- and illite/smectite types. The outcropped sandstone occurred in middle diagenetic stage-A on the basis of the clay mineral composition. The development factor of the formation of kaolinite type clay mineral is caused mainly by the organic acid from the coal-bearing formation and nmdstone during the diagenesis process in Lower Cretaceous Chengzihe Formation and Muling Formation in the Jixi Basin. The weak hydrodynamic force of sedimentary facies made the sandstone leaching condition poor, which is the reason forming the aggregation of clay minerals of the illite/ smectite-and illite types.
基金Supported by China Geological Survey Project(No.DD20160104-01)
文摘The sedimentary facies of Chengzihe and Muling formations of Early Cretaceous coal-bearing strata in Shuangyashan Basin were studied via petrography,grain-size analysis and borehole data analysis. Based on the sedimentary characteristics and temporal and spatial distribution of the sedimentary facies,sedimentary facies of the Early Cretaceous Chengzihe and Muling formations were mapped. The results suggest that fan delta and lacustrine are the major facies developed,which include fan delta plain,shallow lake and multi-layered marsh coal. For the period from the Chengzihe to the Muling Formation,the sedimentary basin expanded with lake basin migrating to the northeast. The period of the Chengzihe Formation represents a period of growth for delta plain deposits and coal accumulation,whereas Muling Formation represents the development of lacustrine deposits,consisting of mudstone and a few thin coal seams.
