Application Of Pre-stack Multiple Attributes Analysis To Coalbed Methane Prediction In Q Area

With the rapid development of the national economy, China's conventional oil and gas field resources can not meet the growing economic and living needs. Therefore,unconventional energy coalbed methane caused more attention. So far, China's coalbed methane extraction only accounts for a relatively small part of the total amount of resources, most concentrated in the structural geological background of the Qinshui Basin and Ordos in the eastern margin of high-grade coal. In the study area, the coal resources are rich and the degree of thermal evolution is also very high. However, in the process of coalbed methane exploration and production,it is found that the production of single well is low and the stable yield is short. Therefore, it is imperative to find a reservoir prediction method for detecting coalbed methane. In this paper,the pre-stack multiple attributes research method is used to predict the favorable area of favorable coal reservoirs in the Q area.According to the fine structure of the two-dimensional seismic section, the top of the camel neck sandstone, the top of the 3# coal seam, the top surface of the 15# coal seam, the Ordovician the composition of the top layer of the limestone structure, the implementation of the number of structural traps and area. Based on the longitudinal and transverse wave logging data of the study area, the reservoir characteristics of the 3# coal seam line are analyzed, and the acoustic and density curves are normalized. The physical parameters of the petro, the model of rock physics forward, which is the most matching with the work area, and the model is used to construct the shear wave data curve by fluid displacement.The pre-stack AVO attribute analysis, prestack AVO longitudinal and transverse wave inversion and prestack FVO inversion are analyzed from the pre-stack multiple attributes analysis of coalbed methane favorable enrichment area. The results show that the interbeds, gradients, quasi-Poisson's ratio, fluid factors, pre-stack AVO and FVO inversion,plan maps and fluid distribution characteristics of the prediction,quantitative division of coal-bed gas enrichment area, the results and earthquake Profiles, actual logging and geological data are more in line.In this paper, we focus on the comprehensive analysis of the pre-stack multiple attributes of the 3# coal seam, and then combine the physical properties, gas-bearing and trapping background of the target layer to quantitatively divide the coalbed methane enrichment area to form a comprehensive seismic attribute. Wave inversion and pre-stack FVO attributes of the technical process and ideas for similar areas of exploration and mining has accumulated experience and provide better research ideas.