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Collaborating Authors
Hren, David
Extended-POCS 5D technology and enhanced depth imaging leads to improved well planning and geosteering performance of the unconventional shale gas reservoirs
Hren, David (In-Depth Geophysical, Inc.) | Sim Lee, King (In-Depth Geophysical, Inc.) | Li, Tianjiang (In-Depth Geophysical, Inc.) | Zhang, Kai (Chevron) | Hagbo, Casey (Chevron)
ABSTRACT During the recent years of U.S. shale gas boom, development and production from the shale formations in North America has been growing steadily. Accurate structural imaging of the shale reservoirs is critical for structural interpretation and the planning of the horizontal wells. It is commonly found that acquired field seismic data show very unbalanced spatial coverages due to acquisition permitting and geographical obstacles. EPOCS-Recon (Jiang, 2017) has been applied for data reconstruction with the feature of preserving subtle structural details and the amplitude fidelity. A unique interleaving workflow of Land Full Waveform Inversion (FWI) and structural constraint Tomography has been adopted to build a high resolution depth model with well calibrations. Post-migration L1 Frequency Normalization (LFN) (Chiu, 2018) processing has enhanced the resolution of the reservoir intervals. The integrated workflow has been applied to an Appalachian basin dataset and the final seismic data has leaded to better geosteering performance. Presentation Date: Wednesday, September 18, 2019 Session Start Time: 1:50 PM Presentation Time: 4:20 PM Location: 221B Presentation Type: Oral
- North America > United States > Pennsylvania (0.91)
- North America > United States > Ohio (0.90)
- North America > United States > West Virginia (0.68)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling (0.50)
- Geophysics > Seismic Surveying > Seismic Processing > Seismic Migration (0.48)
- North America > United States > Tennessee > Appalachian Basin (0.99)
- North America > United States > Kentucky > Appalachian Basin (0.99)
- North America > United States > Georgia > Appalachian Basin (0.99)
- (11 more...)
Compressive seismic reconstruction with extended POCS for arbitrary irregular acquisition
Jiang, Tao (In-depth Geophysical, Inc.) | Gong, Bin (In-depth Geophysical, Inc.) | Qiao, Feng (In-depth Geophysical, Inc.) | Jiang, Yifeng (In-depth Geophysical, Inc.) | Chen, Anbo (In-depth Geophysical, Inc.) | Hren, David (In-depth Geophysical, Inc.) | Meng, Zhaobo (In-depth Geophysical, Inc.)
ABSTRACT Large-scale seismic acquisition based on compressive sensing (CS) has been made practical recently, thanks to the advance in CS algorithms and increasing computation power (Mosher, 2014; Li, 2013). Compressive seismic acquisition (CSA) can substantially reduce time and costs with proper compressive seismic de-blending (CSD) and especially compressive seismic reconstruction (CSR). Projection onto convex sets (POCS) is a very popular choice among various mathematical approaches for CSR, because of its efficiency, simple parameterization, and flexibility to expand to high dimensions. However, the efficiency of POCS by utilizing FFT leads to its main drawback of relying on regular grids and 4D binning before 5D interpolation. In this paper, we propose an extended POCS (EPOCS) algorithm to incorporate an interpolating operator into the sampling operator and extend its usage for under-sampled arbitrary irregular acquisition. This is important because CSR relies on grids with certain designed randomness. Both synthetic and real data tests demonstrate the effectiveness of the CSR with EPOCS. Presentation Date: Tuesday, September 26, 2017 Start Time: 4:20 PM Location: 360A Presentation Type: ORAL
4D Processing for WATS on NATS: A Case Study at Kepler and Ariel Fields
Elebiju, Bunmi (BP America) | Ariston, Pierre-Olivier (BP America) | van Gestel, Jean-Paul (BP America) | Murphy, Rachel (BP America) | Chakraborty, Samarjit (BP America) | Jansen, Kjetil (BP America) | Rodenberger, Douglas (Shell America) | White, Roy C. (Shell America) | Chen, Yongping (CGG) | Hren, David (CGG) | Hu, Lingli (CGG) | Huang, Yan (CGG)
Summary Using the Kepler and Ariel Fields as a case study, this paper discusses the processing challenges and solutions applied to a 4D co-processing of Wide Azimuth Towed Streamer (WATS) on Narrow Azimuth Towed Streamer (NATS) data. Unlike a dedicated 4D acquisition, WATS on NATS 4D has relatively low repeatability in terms of acquisition geometry and bandwidth differences. All these factors can negatively impact the extraction of a meaningful 4D signal. In this paper, we demonstrate how processing techniques can help to increase repeatability and enhance 4D signal. We focus on the following 4D processing procedures: 4D co-binning, data matching, and post-migration co-denoise. Due largely to these techniques, the final co-processed volumes show an optimized 4D seismic signal with a median Normalized Root Mean Square (NRMS, which measures the repeatability between base and monitor. Details refer to Kragh and Christie, 2002) of 0.10 along the water bottom and 0.28 above the reservoir.
- North America > United States > Gulf of Mexico > Central GOM > East Gulf Coast Tertiary Basin > Mississippi Canyon > Block 851 (0.99)
- North America > United States > Gulf of Mexico > Central GOM > East Gulf Coast Tertiary Basin > Mississippi Canyon > Block 850 (0.99)
- North America > United States > Gulf of Mexico > Central GOM > East Gulf Coast Tertiary Basin > Mississippi Canyon > Block 808 (0.99)
- (15 more...)