A5101645755- Seismic Imaging and Inversion Techniques
- Seismic Waves and Analysis
- Hydraulic Fracturing and Reservoir Analysis
- Hydrocarbon exploration and reservoir analysis
- Drilling and Well Engineering
- Reservoir Engineering and Simulation Methods
- Methane Hydrates and Related Phenomena
- Geophysical Methods and Applications
- Ultrasonics and Acoustic Wave Propagation
- Advanced Surface Polishing Techniques
- Geological Modeling and Analysis
- Geological and Geophysical Studies
- Optical measurement and interference techniques
- Image and Signal Denoising Methods
- Non-Destructive Testing Techniques
- Geological formations and processes
- High-pressure geophysics and materials
- Rock Mechanics and Modeling
- Seismology and Earthquake Studies
- Advanced Measurement and Metrology Techniques
- Advanced Electrical Measurement Techniques
- Ubiquitin and proteasome pathways
- Advanced Image Processing Techniques
- Metaheuristic Optimization Algorithms Research
- Molecular Biology Techniques and Applications
China National Petroleum Corporation (China)
2011-2024
Shenzhen University Health Science Center
2024
Shenzhen University
2023
Nanjing Normal University
2022
University of Louisiana at Lafayette
2018
The University of Texas at Austin
2010-2011
Chinese Academy of Sciences
2004-2007
Institute of Geology and Geophysics
2004
The formation containing shallow gas clouds poses a major challenge for conventional P-wave seismic surveys in the Sanhu area, Qaidam Basin, west China, as it dramatically attenuates P-waves, resulting high uncertainty subsurface structure and complexity reservoir characterization. To address this issue, we proposed workflow of direct shear-wave (S-S) surveys. This is because shear wave not significantly affected by pore fluid. Our includes acquisition, processing, interpretation calibration...
Prestack depth seismic imaging is increasingly being used in industry, which has also led to an increasing need for its inversion results, such as acoustic impedance (AI), reservoir characterization. Conventional methods characterization are usually implemented the time domain. A depth-time conversion would be required before of depth-domain data, depend on accurate velocity model and a fine time-depth algorithm. Thus, it could beneficial that we can directly invert migrated data....
The Qigequan Formation at the Sanhu area of Qaidam Basin in western China is a significant gas producing formation. However, conventional P-wave seismic survey conducted this region reveals presence extensive clouds that strongly attenuate P waves, resulting substantial uncertainty regarding subsurface structure. To address challenge, 3D-9C was to produce S-wave reflection data unaffected by and yielding remarkably clearer images with higher level confidence. processing largely used...
Sanhu area in Qaidam Basin is one of the major onshore gas fields China Mainland, its pay zone at Quaternary and depth reservoir shallow. It difficult to solve gas-bearing anomaly low-relief structure imaging problems true or false "Gas Cloud Areas" through pure P-wave seismic data acquired previously. According special features geological conditions this area, following techniques are used: 1) The joint excitation technology low-frequency vibrator S-wave-vibrator adopted. on hand, downward...
Over several years of development, CNPC has become a powerful geophysical force. The company taken an international leadership in overall onshore seismic capacity and developed numerous unique technologies. is particularly known for developing world-leading exploration technologies application complex mountainous areas across Loess Tableland prospects. In high-end R&D programs, such as high-density data acquisition, digital acquisition systems, multicomponent concepts have demonstrated value...
Joint inversion of PP and PS reflection data has been hindered by the difficult task registration or correlation events. It can perhaps be achieved registering events during but resulting algorithm is generally computationally intensive. In this paper, we propose a stochastic which have registered to same time scale using new interval velocity analysis technique. The prestack wave joint angle gathers very fast simulated annealing (VFSA) algorithm. objective function attempts match both data;...
There are shallow biogas reservoirs at the Sanhu Area of Qaidam Basin in West China. Due to their influence, it is difficult get accurate imaging velocity through P-P data processing, leading false fault structure and low identification accuracy thin interbedded gas layers. And propagation pure shear wave by generated horizontal force source independent formation. For this reason, we excited S-S waves with vibrator vertical directly receive both kinds 3C receivers solve structural reservoir...
Many prestack depth migration methods have been developed and widely used to generate depth-domain seismic images, resulting in a need for inversion of the subsurface elastic properties reservoir characterization. Time-domain techniques often are after data set is transformed time domain. We provide new technique directly inverting properties: P-impedance ([Formula: see text]), S-impedance density text]) The proposed workflow eliminates time-depth/depth-time conversion, making it efficient...
Depth domain seismic datasets become more and popular used around industry, which leads to the increasing demands invert depth pre-stack data for elastic properties. Conventional method usually converts dataset into time before inversion processing. The results can be converted back reservoir characterization. We here introduce an alternative direct of without any time-depth conversion. uses both angle variant wavelets accommodate possible strong spectra variation by using a depthwavenumber...
Converted wave (Sv‐wave) velocity analysis approach is always a difficult problem in 3C seismic data processing. Conventional and image are generally computed different time scales; P‐wave processed with P‐P scale P‐Sv scale. basically separately causing errors horizon calibration between P Sv‐waves. Here we report on converted from that can Sv‐waves the same or In fact carry out depth domain such common conversion points updated at each iteration of analysis. Thus mapping to P‐SV scales...
3D9C seismic acquisition uses one vertical- and two horizontal-excitations at each shot point. The 4C SS-wave data from the Sanhu China survey are rotated by Alford method good results were achieved. To reduce exploration cost, we propose a for acquired with horizontal excitation, 3D6C SV/SH separation azimuthally isotropic media S1/S2 HTI media. Synthetic real proved correctness feasibility of method.
Multicomponent seismic survey can provide a variety of information for development reservoirs, reduce the multiresolution predicting reservoirs and increase successful drilling rate. In past two years, BGP has imported digital seismograph geophones to research techniques in 3C/3D data acquisition, processing interpretation, design & demonstration 3D converted‐wave geometry, multiwave uphole surface converted wave static corrections, rotation horizontal component field separation, computing...
More and more attentions have been paid to the applications of converted wave exploration in assessing oil gas reservoirs. Experimental study has also fulfilled China for over 10 years. Due difficulties acquisition, statics, data processing interpretation, technology a slow progress. In past few years, series studies aiming technologies static correction Sulige Gas Field, Erdos Basin. The section processed is high quality; interpretation result correlates with drilling wonderfully
<title>Abstract</title> Extrachromosomal DNA (ecDNA) drives the evolution of cancer cells by conferring survival advantages over normal cells. However, functional importance ecDNA replication and maintenance is yet to be evaluated, molecular components that contributed these processes remain largely unknown. Here, using CRISPR-C (circularization genes chromosomes CRISPR) technology synthetic circular mimicking identified in tumors, we generated ecDNA-positive (ecDNA+) cell models. Using...
Abstract Converted wave (Sv-wave) velocity analysis approach is always a difficult problem in 3C seismic data processing. Conventional and image are generally computed different time scales; PP processed with scale PS scale. basically separately causing errors horizon calibration between waves. Joint inversion of reflection has been hindered by the task registration or correlation events. It can perhaps be achieved registering events during but resulting algorithm computationally intensive....
In a Bayesian framework, solution of an inverse problem is given by the posterior probability density (PPD) function model. this paper we report on development new stochastic method, named greedy annealed importance sampling (GAIS), to draw samples from PPD provide unbiased estimates uncertainty. The advantages technique are unbiasedness and reduction in true variance obtained searching important regions distribution. Traditional Markov Chain Monte Carlo (MCMC) methods...
The ongoing exploration in the Saihantala Depression has been focused on lithologic reservoirs. It is difficult to reduce ambiguity and assess uncertainty seismic lithology discrimination fluid type identification using conventional compressional wave (P‐wave) exploration. A three dimensional, component (3D‐3C) survey with P‐wave source 3C geophones performed study region, taking advantage of combining converted (C‐wave or PS‐wave) Instead vibroseis, a dynamite used improve signal‐to‐noise...
The downward propagating energy from a horizontal vibrator is mainly in the form of shear waves especially at near offsets. With increase offset, wave converted P-wave (SVP) increases and thus SVP another practical choice for converted-wave exploration. Like what PSV wave, azimuthal anisotropic medium also subjected to influence splitting, this makes it issue processing. In paper, we did dealing with shown: least square method (Bale, 2012) was used calculate subsurface fracture orientations...
China's eastern region, in which Daqing oil field is located, produces more than 80% of the nation's annual and gas output. However, after 40 years exploration production, major reservoirs area's fields eventually have become less productive. The area are characterized by stratigraphic traps, fault blocks, minor effective thickness (less 10 m general). To identify such we developed a series high-resolution 3D geophysical methods. This not only helped discovery new reservoirs, but also...