Bgp In

Bio: Bgp In is an academic researcher. The author has contributed to research in topics: Seismic inversion & Seismic migration. The author has an hindex of 3, co-authored 60 publications receiving 86 citations.

A new way to realize spectral modeling deconvolution

Abstract: Compared with the routine deconvolution,the spectral modeling deconvolution has better adaptivity for non-white noise reflection coefficient,with the method the better results can be obtained in the processing in which the residual wavelet was compressed so the resolution was raised.However the method has following limitations:(1)The polynomial used in fitting limits the shape of the wavelet amplitude spectrum;(2)It does not consider the color characteristics of the reflection coefficient,the expected blue characteristic of the reflection coefficient amplitude spectrum was not seen in the deconvolution results.In order to compensate the defects,a new way to realize spectral modeling deconvolution was proposed in this paper:(1)Do not use polynomial fitting,regarding the amplitude spectrum of the seismic records as a real sequence,a filter was used to smooth the sequence so the wavelet amplitude spectrum could be estimated;(2)Considering the color characteristic of the reflection coefficient sequence,before modeling the wavelet amplitude spectrum,the color influence of the reflection coefficient sequence was compressed.The theoretical experiment and processing results for the field datasets show that the method is simple and easy to realize,with the method the wavelet amplitude spectrum can be accurately estimated,better deconvolution results can be obtained.

Stratum absorption and attenuation compensation based on improved generalized S-transform

Abstract: The Gauss function whose window width changes in inverse proportion with frequency was used in generalized S-transform,while for improved generalized S-transform the variable width window was used,the window's width change with frequency was proportional.That is,the window is narrower for low frequency with the high time resolution,while the window is wider for high frequency with the high frequency resolution.With the new method the lossless generalized S-inverse transform can be conducted and time-dependent Q value can be estimated,so the under-compensation and over compensation which developed in traditional Q compensation method were avoided.After compensation,the variation trend of the timefrequency spectrum are exactly the same at every moment,and the seismic frequency bands are the same.Application of the new method in the field VSP data shows that the new method works very well for absorption and attenuation compensation,it also raises resolution and improves data quality.

High precision seismic time-frequency spectrum decomposition method and its application

Abstract: Because of Heisenberg's uncertainty principle,the linear algorithms of time-frequency spectral decomposition,for example wavelet transform and generalized S transform,cannot simultaneously have high resolution in time and frequency domains.Overcoming the window function limit,the matching pursuit can precisely characterize signal features in time and frequency domains.This paper firstly discusses the algorithm theory of matching pursuit to seismic signal,and then put forward the reasonable improvement to standard Morlet wavelet,which can perfect the time-frequency atomic database,thus enhancing the precision of seismic signal matching decomposition.Based on the time-bandwidth of Morlet wavelet,the paper finally uses window treatment technology to dynamically scan matching wavelet atoms at the same time in multi-windows,so that calculation efficiency can be appropriately increasing.The model test and actual data analysis show that matching pursuit of seismic signal based on improved Morlet wavelet is more precise and efficient,and has some antinoise ability,suitable for quantitative analysis of the spectrum variation of seismic data,which will be helpful to study oil gas reservoir distribution.

Seismic exploration for strati-lithologic reservoirs

Abstract: This paper discusses a few specific points on seismic exploration for strati-lithologic reservoirsFirstly we review the general idea of seismic technology for strati-lithologic reservoir identificationSecondly 8 issues of seismic data acquisition and 10 issues of seismic data processing are illuminated in order to obtain a good 3D data cubeThen a set of interpretation approaches for strati-lithologic reservoirs are demonstrated including seismic inversion,attribute analysis,petro-physics analysis,geologic model building,and seismic forward modelingFinally we conclude comprehensive geological researches on seismic dataThe author's observations are given and these could be meaningful for strati-lithologic reservoir identification

The status and development direction of reservoir geophysics in CNPC

Abstract: By reviewing the reservoir geophysics development history and its evolution,reservoir geophysics tasks and its future needs are discussed from reservoir types and production modesComparing with international new progress in reservoir geophysics and combining with reservoir geophysics development history in China,the status and challenges are analyzed in 9aspects,ierock physics analysis,high guality seismic data processing,quantitive seismic data interpretation,borehole seismic,multicomponent seismic,timelapse seismic,joint dynamic analysis with seismic,logging,and reservoir data,microseismic monitoring,and stress field simulationThe future development direction is predicted

Control of differential tectonic evolution on petroleum occurrence in Bohai Bay Basin

Abstract: The Bohai Bay Basin (BBB) is the most petroliferous Cenozoic basin in the east of China. It consists of seven depressions. Each depression has been subjected to different stress states and then has experienced varying faulting processes since the Neogene, especially during the Neotectonism (from the Pliocene to the present). On the basis of the investigation of fault patterns, fault densities and fault activity rates (FARs) for each depression, this paper demonstrates the discrepancy of faulting development and evolution across the BBB. The dynamic mechanism for the differences in faulting is also discussed by the analysis of the regional stress state. The Bozhong Depression is just situated in the transtensional zone induced by the two active strike-slip faults, namely Yingkou-Weifang and Beijing-Penglai. In this depression, the major faults which cut through the Paleogene or the Cenozoic have had higher than 10 m/Ma FARs since the Neogene, and the highest FARs have reached or exceeded 25 m/Ma during the Neotectonism. As a result, most of the petroleum has migrated along these major faults and accumulated within the Neogene. In contrast, in the other depressions of the BBB away from the Bozhong Depression, the FARs of the major faults were decreased to lower than 10 m/Ma since the Neogene, and tended to be zero during the Neotectonism. Therefore, the major faults could not serve as vertical conduits for petroleum migration, and the petroleum was entrapped in the Paleogene. Consequently, the faulting since the Neogene, especially during the Neotectonism, controlled the petroleum richness in vertical strata.

Magnetostratigraphic Construct of Awate Section in the North Tarim Basin: the Impulse Uplift of Tianshan Range

Abstract: Magnetostratigraphic results of Awate Section from 1606 horizons in Neogene strata between the upper Jidike Formation and the base of the Xiyu Formation in the Kuche Depression of the Tarim Basin, are used to evaluate the tectonic evolution of Tianshan Range. Progressive thermal demagnetization successfully isolated a linear characteristic remanent magnetization of dual polarity between 450 and 680°C, from which a magnetic polarity sequence is constructed. Twenty-six reversed and twenty-six normal polarity chrons can be identified from the composite magnetostratigraphy, which correlate between ~1.7 and ~15.1 Ma with the geomagnetic polarity time scale of Cande and Kent. Sedimentation rates from magnetostratigraphic age versus height show a decrease from ~22 to ~7 cm/ka at ~11 Ma, and around 6.5 Ma there was another abrupt increase from ~7 to ~68 cm/ka. These episodic changes can be connected with Late Cenozoic impulse uplift of Tianshan Range.

Surface-to-Underground Transient Electromagnetic Detection of Water-Bearing Goaves

Abstract: Water-bearing goaves are one of the main causes for water inrush accidents in Chinese coal mines. At present, both the surface and subsurface geophysical technologies cannot fully meet the technical requirements of high precision detection for coal mines safety development and production. Based on the surface-to-borehole electromagnetic method, we propose a surface-to-underground transient electromagnetic prospecting (SUTEM), in which the large rectangular loop is laid on the surface as the transmitting source and the receivers are laid in the subsurface roadways of the coal mines. First, we describe and discuss the SUTEM signal response using numerical simulation for a homogeneous half space. The numerical results show that the curve of the induced electromotive force (EMF) first increases to a peak, and then decreases gradually till the end of the time window, the shape of the curve closely reassembles a parabolic. So the conductive bodies can be identified with the characters of the EMF curve. Second, we conducted a numerical simulation using the 3-D, unstructured tetrahedral grids vector finite-element total-field electromagnetic forward modeling algorithm for the response of typical 1-D layered models and 3-D models. The results show that the relative sensitivity is no relation with the depth of the abnormal layer when receiving points are under the layer, the deeper the abnormal layer is, the more obvious the advantage of SUTEM is. Finally, the field experiment was carried out at a coal mine, where the positions of water-bearing goaves are known. The SUTEM detection results do not exhibit a clear trend in the variation of electrical properties in the vertical direction of the formation. However, the variation in the lateral electrical properties is clear, the expression of the low-resistivity goaves is much clearer than the results from the surface TEM. The field experiment result is in agreement with the suggestions of the computer simulation and confirms the effectiveness of SUTEM.