Abstract: To speed up the exploration of Carboniferous volcanics in the Santanghu Basin and to promote the use of reserves, technological research is conducted to solve the difficulties in volcanic reservoir identification and evaluation of oil/gas/water zones, and the problems of strong reservoir heterogeinity and low natural production. By applying the gas surveying technology, the fluorescence quantitative technology, the gas chromatography logging technology and the elemental capture spectroscopy (ECS) logging technology, the Formation Micro Image (FMI) well logging technology, the difficulties in volcanic reservoir evaluation are solved effectively. Seismic reflection characteristics of high-quality volcanic rock reservoirs are studied and the distribution range of high-quality reservoirs are delineated with high accuracy. Based on the optimization of stimulation technologies of volcanic reservoirs, the emulsion fracturing systems is worked out, and it shows good compatibility with the volcanic reservoir in weathered zone that has strong water sensitivity. The system demonstrates satisfying fracture-stimulation effect. The application of new technologies effectively promote Carboniferous exploration, production of the third-level reservoir of the Carboniferous Kalagang Formation exceeds 100 million tons within two years, and a block with high quality reserves is therefore formed.

Key words: volcanics, lithologic identification, oil/gas/water zone, emulsion fracturing, Santanghu Basin