Key technologies for deep concealed karst reservoirs prediction based on seismic data and application
CHANG Shaoying12, MU Xiaoliang1, ZENG Jianhui1, CHEN Jianwei2, GAO Qian3
1. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China; 2. PetroChina Hangzhou Institute of Geology, Hangzhou, Zhejiang 310023, China; 3. College of Geophysics, China University of Petroleum(Beijing), Beijing 102249, China
Abstract：Deep carbonate reservoirs are important targets of oil and gas exploration and development in China. Due to the fast attenuation of effective deep seismic signals, weak effective signals, low resolution of seismic data, and the further weakened reservoir reflection characteristics by the shielding of the strong reflection chara-cteristic of formation interfaces, the elastic diffe-rence between reservoirs and surrounding rock is small, and the characteristics are difficult to detect. Moreover, effective reservoirs are often concealed, which affects the efficient exploration and development of oil reservoirs. Considering these characteristics of deep reservoirs, we use GeoEast platform to form three key technologies, namely, the Q-compensated migration technology, wavelet decomposition technology for removing the long-wavelength effect of formation interfaces, and multi-band sensitive attribute fusion technology. The research shows that: (a) The Q-compensated migration technology can well compensate for deep energy loss and improve the resolution of seismic data; (b) The wavelet decomposition technology for removing the long-wavelength effect of formation interfaces can remove the shielding effect of formation response characteristics on small-scale concealed reservoirs and restore the seismic response characteristics of deep carbonate reservoirs; (c) The multi-band sensitive attribute fusion techno-logy has a good application effect in the description of concealed karst reservoirs. The combination of the three practical technologies is an important means for deep concealed reservoir excavation and can provide good technical support for oilfields to increase reserves and production.
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