Identification methods of coal-bearing strata and coal group of Paleogene in sea area

Abstract：Based on the sedimentology,logging,mathematics,and seismic prospecting and so on,the coal-bearing strata and coal seams was recognized,four methods were concluded and the coal seam was forecasted by seismic characteristics.The results show that the program of logical comparison and clustering methodology are effective semi-quantitative methods.Clustering methodology and spider diagram are effective equity methods but not be in common use.Only by synthetically utilizing these four methods the coal-bearing stratum and coal seams can be forecasted exactly.It is also effective to recognize the coal-bearing strata and coal seams by using the seismic inversion.By study on the seismic sections of Qiongdongnan Basin,the characteristics of lower instantaneous frequency and high amplitude of vibration in the Yacheng Formation,it is proved the methods of three-instantaneous profile technology is feasble.By constrained impedance inversion of seismic sections of C-93-79 and C-52-79,it is found that there is consistency between the inversions of model and neutral network and the strata with coal.So it is an effective method to predict the distribution of the coal seams and coal-bearing strata.