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Featured researches published by Fanchang Zhang.


Seg Technical Program Expanded Abstracts | 2009

Fluid discrimination study from Fluid Elastic Impedance (FEI)

Shixin Zhang; Xingyao Yin; Fanchang Zhang

Summary We propose a method, named Fluid elastic impedance (FEI) which is derived by the extending the concept of Elastic Impedance (Connolly, 1999) to make the fluid discrimination more stable and reliable. The fluid component of the in-situ reservoir rock here is proposed based on the poroelasticity theory of Boit and Gassmann, and rock physics analysis and forward modeling result based on the well-logging measurement indicate that the fluid component ( f ) is an effective tool for fluid discrimination. Our study shows that the FEI inversion can extract the fluid component more valuable and easier to carry out research on the fluid discrimination. A real data example illustrates the applicability of the proposed method.


Seg Technical Program Expanded Abstracts | 2009

Joint Inversion of 3D Seismic, VSP And Crosswell Seismic Data

Danping Cao; Xingyao Yin; Fanchang Zhang

Inversion of 3D seismic data is a strongly ill-posed problem. The inversion resolution is limited by the bandwidth of the seismic data used. A good choice to get accurate result is the joint inversion with all the available information. Based on the Bayesian theorem, the VSP and crosswell seismic data is injected into the inversion process according to the joint probability distribution. The joint inversion theory is built and the inversion stage is complete. Model test shows that the joint inversion method possessed the different frequency bandwidth information of VSP and crosswell data, the inversion result is more accurate and the resolution is higher. The joint inversion method of 3D seismic data, VSP and crosswell seismic data is feasible with different field data. The impedance inversion result is more reasonable and can match better with the logging data.


Seg Technical Program Expanded Abstracts | 2010

Quasi fluid modulus for delicate lithology and fluid discrimination

Shixin Zhang; Xingyao Yin; Fanchang Zhang

Summary The quasi fluid modulus is a data adaptive attribute based on a weighted combination of fluid/porosity term ( f ) and shear modulus (μ ). The result of analysis from the a well dataset from the JZ field shows that, for sandstones and clay-rich sandstones, the quasi fluid modulus is a significant attribute to discriminate between shale, dry sand, gas sand, oil sand and wet sand. Estimation of this attribute can be done by simple algebraic computation based on rock physics analysis between the fluid/porosity modulus and shear modulus. A real data example illustrates the applicability of the new attribute and shows the advantage of seperating different lithology and fluid types through the comparison with other DHI.


Beijing 2009 International Geophysical Conference and Exposition | 2009

Impedance Inversion Method Constrained with Crosswell Seismic Data

Danping Cao; Xingyao Yin; Fanchang Zhang

Summary Impedance inversion of surface seismic data is an inherently non-unique problem. The conventional seismic inversion resolution is limited to characterize the subsurface reservoirs because of the narrow frequency bandwidth. The high frequency components of crosswell seismic data are rich enough to connect the surface seismic data and the logging curve. Based on the sparse spike inversion assumption, the crosswell seismic data is introduced into the surface seismic impedance inversion flow. The objective function of impedance inversion method is built constrained with the crosswell seismic data and well logging data. The field data inversion result shows that the crosswell seismic data constrained inversion method can improve the resolution of the conventional well-logging constrained inversion method. It is a new way to solve the geology problems with kinds of geophysical data.


Journal of Applied Geophysics | 2014

Seismic inversion based on L1-norm misfit function and total variation regularization

Fanchang Zhang; Ronghuo Dai; Hanqing Liu


Geophysics | 2016

Seismic inversion based on proximal objective function optimization algorithm

Ronghuo Dai; Fanchang Zhang; Hanqing Liu


Archive | 2010

Fluid elastic impedance inversion technology

Xingyao Yin; Fanchang Zhang; Shixin Zhang


Archive | 2012

Method for building seismic data matching pursuit common frequency body

Fanchang Zhang; Chuanhui Li; Xingyao Yin


Seg Technical Program Expanded Abstracts | 2015

Direct estimation of petrophysical properties based on AVO inversion

Dong Li; Fanchang Zhang


Journal of Petroleum Science and Engineering | 2015

High order approximation for scattering matrix in layered elastic medium and its application in pre-stack seismic inversion

Fanchang Zhang; Ronghuo Dai; Hanqing Liu

Collaboration


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Ronghuo Dai

China University of Petroleum

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Hanqing Liu

China University of Petroleum

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Xingyao Yin

China University of Petroleum

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Shixin Zhang

China University of Petroleum

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Danping Cao

China University of Petroleum

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Pu Wang

China University of Petroleum

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Cheng Yin

Southwest Petroleum University

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Chuanhui Li

China University of Geosciences

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Dong Li

China University of Petroleum

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Hanging Liu

China University of Petroleum

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