Abstract
ABSTRACTBlended acquisition along with efficient spatial sampling is capable of providing high‐quality seismic data in a cost‐effective and productive manner. While deblending and data reconstruction conventionally accompany this way of data acquisition, the recorded data can be processed directly to estimate subsurface properties. We establish a workflow to design survey parameters that account for the source blending as well as the spatial sampling of sources and detectors. The proposed method involves an iterative scheme to derive the survey design leading to optimum reflectivity and velocity estimation via joint migration inversion. In the workflow, we extend the standard implementation of joint migration inversion to cope with the data acquired in a blended fashion along with irregular detector and source geometries. This makes a direct estimation of reflectivity and velocity models feasible without the need of deblending or data reconstruction. During the iterations, the errors in reflectivity and velocity estimates are used to update the survey parameters by integrating a genetic algorithm and a convolutional neural network. Bio‐inspired operators enable the simultaneous update of the blending and sampling operators. To relate the choice of survey parameters to the performance of joint migration inversion, we utilize a convolutional neural network. The applied network architecture discards suboptimal solutions among newly generated ones. Conversely, it carries optimal ones to the subsequent step, which improves the efficiency of the proposed approach. The resultant acquisition scenario yields a notable enhancement in both reflectivity and velocity estimation attributable to the choice of survey parameters.
Highlights
During the last decade, blended acquisition has realized the industry’s ambition towards efficient and cost-effective seismic operations that still attain the required data quality (Beasley, Ronald and Jiang 1998; Berkhout 2008; Bouska 2010; Abma et al 2012; Nakayama et al 2015)
The numerical examples in this study demonstrate that the joint migration inversion (JMI) results can vary with the design of survey parameters
Designed parameters lead to the enhancement of both reflectivity and velocity models estimated directly from blended and irregularly sampled data
Summary
During the last decade, blended acquisition has realized the industry’s ambition towards efficient and cost-effective seismic operations that still attain the required data quality (Beasley, Ronald and Jiang 1998; Berkhout 2008; Bouska 2010; Abma et al 2012; Nakayama et al 2015). This paper, introduces a survey-design workflow that iteratively optimizes the survey parameters related to both blending and spatial sampling of detectors and sources, leading to satisfactory reflectivity and velocity estimation via joint migration inversion (JMI). The workflow utilizes errors in reflectivity and velocity estimates from the JMI process for given survey design They are assigned to its objective function and are subsequently input into a survey-parameter update system based on the integration of a genetic algorithm (GA) and a convolutional neural network (CNN). Our approach iteratively computes the acquisition design parameters D, S and that minimize the objective-function vector, meaning that optimum reflectivity and velocity estimates can be obtained. 1: Set ng and np (= nc + nm) 2: Generate initial population, c0 (= c0,1, . . . , c0,np T )
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