Volcanic Sedimentation Petrography facies, Identification and Oil-gas Bearing, Chagan Depression, Yin'gen Basin

Key words: 
• volcanic sedimentation petrography /
• seismic identification /
• igneous reservoir /
• Chagan depression /
• Yin'gen basin

Abstract: Based on volcanic sedimentation petrography facies and their identification on seismic, the relationship between volcanic petrography sedimentation facies and oil-gas reservoirs has been discussed, then proposed the prospec- tive areas. In Yin'gen basin the types of volcanic sedimentation petrography facies include exp losion facies, outflow facies, volcanic-neck facies and volcanic sedimentary facies, especially the outflow facies. According to the geophysical characteristics of volcanic sedimentation petrography facies ( high seismic velocity, high density, high suscep tibil- ity, high resistance and high absorp tion coefficient to seismic wave), four volcanic sedimentation petrography facies and four intruded petrography facies are established. Deep-faults control the distribution of igneous rocks and igneous traps. The prospective zones of igneous reservoir are near fault belts.