Abstract: The exploration and development of super-deep Paleozoic carbonate reservoir of fissured-cavity that is regarded as difficult problem of world level has been studied by Northwest Petroleum Bureau, CNSPC in recent years. A series of technologies that have been applied to Paleozoic carbonate reservoirs in Tahe oilfield are developed, such as 3D seismic imaging processing and detailed interpretation, carbonate reservoir forecasting and evaluation, the oil and gas recognition as well as acid-fracturing, well test and complete, under-balanced drilling, horizontal well drilling, vertical well with lateral drilling, etc. The greater advances and notable economic effectiveness are obtained.

Key words: Tarim basin, Tahe oilfield, Ordovician, fracture, cavity, carbonate reservoir, exploration, technology