Cgg Services Sas

Cgg Services Sa

Capcon Limited

Min Wang

Yi Xie

Yang Li

Adriano Gomes

Barry Hung

Hong Gang Wang

Feng Yu

Tengfei Wang

Xiaodong Wu

Weiquan Xu

Stephen Kefeng Xin

Dechun Lin

In one aspect of the invention, a semiconductor packaging apparatus is provided and comprises: a bonding device for bonding a component to a substrate; a motor for driving the bonding device to operate according to a predetermined motion trajectory; a position sensor for detecting a position of the bonding device at a specific time point and generating a position signal; a motion control unit comprising a path planner for generating a position-time command for the bonding device according to a bonding process requirement, the motion control unit being configured to enable the path planner to update the position-time command based on a touch information between the component and the substrate. In a further aspect of the invention, a control algorithm for the semiconductor packaging apparatus to identify and generate the touch information is also provided, and the process control flow is optimized using the touch information.

Apparatus, control method and control device of semiconductor packaging

A method for seismic exploration uses visco-acoustic FWI to model velocity and quality factor Q for an explored subsurface formation. The method employs frequency-dependent velocity to reduce cross-talk between Q and velocity and may be used for both isotropic and anisotropic media.

Visco-acoustic full waveform inversion of velocity and Q

A seismic exploration method includes performing a true amplitude PSDM based on an initial velocity model of a subsurface formation to obtain a reflectivity model, and then a Born modeling using the reflectivity model to generate synthetic data. An image-based reflection full waveform inversion is applied to a cost function of differences between seismic data acquired over the subsurface formation and the synthetic data to update the initial velocity model. The updated velocity model enables exploring the presence of and/or assisting in the extraction of natural resources from the subsurface formation.

Seismic exploration using image-based reflection full waveform inversion to update low wavenumber velocity model

Methods and apparatuses for processing seismic data acquired with multicomponent sensors build an accurate S-wave velocity model of a surveyed underground formation using a full waveform inversion (FWI) approach. PS synthetic data is generated using approximative acoustic equations in anisotropic media with a P-wave model, a current S-wave velocity model and a reflectivity model as inputs. The current S-wave velocity model is updated using FWI to minimize an amplitude-discrepancy-mitigating cost function that alleviates the amplitude mismatch between the PS observed data and the PS synthetic data due to the use of the approximative acoustic equations.

Full waveform inversion approach to building an S-wave velocity model using PS data

Computing device, computer instructions and method for determining an image of a surveyed subsurface. The method includes receiving recorded wave fields D recorded with seismic sensors over the subsurface; generating a series of modified recorded wave fields Dbased on the recorded wave fields D; iteratively applying an objective function Fto (1) one element Dof the series of modified recorded wave fields Dand (2) predicted wave fields P, where 'i' is an index associated with a given iteration; calculating with a computing device an updated velocity model mbased on a previous velocity model mand a step length; and producing the image of the subsurface based on the recorded wave fields D and the updated velocity model m. The predicted wave fields Pare predicted by the previous velocity model m.

Device and method for full waveform inversion

A system and method are disclosed for substantially eliminating the influence of internal multiples when seismic mapping under-water geographical areas of interest without a priori knowledge of subsurface information. The system and method iteratively locate multiple-generating horizons for predicting internal multiples and uses a lower-higher-lower relationship between the multiple generating horizons. The system and method provide an appropriate and cost-effective means for internal multiple attenuation without subsurface information.

Growing community of inventors

Singapore, Singapore

Min Wang