Application of broadband seismic exploration technologies in deep carbonate imaging
ZENG Huahui1, SU Qin1,2, ZHANG Guangrong3, ZENG Ming4, LIU Huan1, MENG Huijie1
1. Northwest Branch, Research Institute of Petroleum Exploration & Development, PetroChina, Lanzhou, Gansu 730020, China; 2. School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China; 3. Oil and Gas Resources Division, PetroChina Southwest Oil and Gas Field Company, Chengdu, Sichuan 610051, China; 4. Research Institute of Petroleum Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu, Sichuan 610041, China
Abstract：Characterized by deep burial, weak signal, thin reservoir, and high heterogeneity, deep carbonate puts forward higher requirements on high-fidelity and high-resolution imaging of deep thin reservoirs. On the basis of broadband seismic data acquisition, the advantageous characteristic modules and technologies of the GeoEast processing system are availed to investigate broadband seismic data processing technologies, including Q absorption compensation technology, Q tomography modeling technology, Q prestack depth migration technology, and low-frequency compensation technology. The effect of high-fidelity and high-resolution imaging of deep thin carbonate reservoirs is thereby effectively enhanced. The processing of actual seismic data shows that in addition to ensuring the signal-to-noise ratio of seismic data, these technologies widen the effective bandwidth of seismic signals and improve the imaging effect and resolution of deep carbonate. Specifically, the platform margins are imaged more clearly, and the stratigraphic contact relationships and the faults are characterized more distinctly. Moreover, these technologies pave the way for fine horizon interpretation and reservoir prediction and reduce the non-uniqueness of seismic data interpretation and inversion. These technologies have a bright application prospect in the "double high" (high-fidelity and high-resolution) seismic data processing for other deep and ultra-deep complex structural areas and thin unconventional oil and gas reservoirs.
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