Direct hydrocarbon accumulation discovery using joint geophysical and geochemical methods
Cao Hui, Zhang Guanghua
Research Institute of Petroleum Geophysical Prospecting, Ministry of Geology and Minerals, No. 21 Weigang, Nanjing City, Jiangsu Province, Postcode: 210014
Abstract：In ENC area, trial direct hydrocarbon accumulation discovery was made by jointly using geochemical survey and geophysical methods: seismic method having high-resolution P-wave and converted S-wave, gravimetric method, magnetic method, micromagnetic method, etc. The technique works by finding relations between known hydrocarbon trap and geochemical anomaly or various geophysical anomalies to form a preliminary pattern of direct hydrocarbon discovery, which is then used to predict hydrocarbon accumulation in an adjacent area. The geophysical and geochemical anomalies result from four factors: hydrocar bon trap, object reservoir, hydrocarbon seepage none and hydrocarbon-altered none. The former two factors can be determined mainly by seismic method, and the latter two by magnetic, induced electric and geochemical methods.The research result in ENC area shows that the technique for direct hydrocarbon discovery using joint geophysical and geochemical methods is feasible.
