Carbonate Research in China-technologies Meeting Tough Challenges

Carbonate reservoir in Western China, which shows tremendous exploration and development opportunity, has become the key area for oil and gas reserves addition and sustainable resources development for China. Compared to the conventional carbonate reservoir, prediction of this kind of reservoir predominated by secondary storage is much more difficult. Seismic detection of dissolved pore and fracture always sets pretty high demand for technology, which further puts serious challenges on exploration and many technological issues for field development plan. Based on a detailed analysis of exploration issues for such complex carbonate reservoir, the key geophysical problems are tackled. Subsequently, a set of techniques for complex carbonate reservoir prediction is established, including pre-stack amplitude-preserved processing, new technologies of rock physics, pre-stack AVO inversion , eismic multi-attributes optimization and integrated prediction, anisotropy detection using pre-stack data with limited azimuthal distribution, fluid identification based on prestack inversion. Additionally, to solve some special questions, diffraction wave field separation and imaging, nonstatorary deconvolution etc are also developed. Moreover, application of this set of technology to field data has proven this technology be effective and feasible. Besides, drilling results show pretty good agreement with our research. Nevertheless, the research has just got started.