Abstract
Gas geochemical surveys appear inherently suitable for petroleum exploration because oil and gas fields are natural accumulations of volatile hydrocarbons. The basis for gas geochemical surveys for petroleum lies in modern concepts of petroleum genesis. Petroleum originates mainly from degradation and thermal cracking of disseminated organic matter in sedimentary rocks. Oil and gas fields are formed by the migration of the resulting liquid and gaseous hydrocarbons and their accumulation in favorable settings, termed traps. Accumulated petroleum is constantly dispersing laterally and vertically, albeit slowly, and this can lead to disappearance or destruction of the accumulation. If gas geochemical surveys are to be applied effectively, proper attention should be paid to the mode of occurrence of gases in the soil. Using available geological and geophysical data, a microseepage migration model should be developed for each survey area, and the sampling and analytical techniques should then be chosen to suit the model. Lithology soil type and surface conditions are also discussed. These play important roles in the distribution and intensity of anomalies, as the pre-discovery traverse over the Jingbian gas field demonstrates. If the entire field is not covered by the gas geochemical survey, anomalies may be missed or their shape and significance misinterpreted.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
