Application of Microbial Geochemical Exploration Technology in Oil and Gas Exploration in Loess Tableland Regions

doi:10.3969/j.issn.1006-6535.2020.05.008

Abstract

Abstract: The northern part of Fuxian County in Yanchang exploration area of the Ordos Basin is located in loess tableland region, and the degree of natural gas exploration is relatively low. Aiming at the problems of weak seismic response, poor applicability and difficult fluid detection in loess tableland region, a comprehensive study was carried out by using microbial geochemical exploration technology combined with oil and gas drilling and geological data. The study results show that: (1) significant microbial anomalies have been detected in the loess tableland region. (2) microbial and geochemical results indicate that the Yanchang exploration area has the characteristics of coexistence of oil and gas. (3) the study area can be divided into 9 microbial abnormal zones and 3 favorable zones. In which, the middle favorable zone indicates a good gas-bearing prospect, the northwest favorable zone has a better gas-bearing property, and the southeast favorable zone may be related to natural gas enrichment. Comprehensive research shows that microbial geochemical exploration technology has certain applicability in the evaluation of hydrocarbon-bearing properties in loess tableland regions. The research results can provide reference for screening favorable oil and gas zones in loess tableland regions.

Key words: microbial hydrocarbon detection, geochemistry, gas-bearing evaluation, Yanchang exploration area, loess tableland region

CLC Number:

TE122.2

Cao Jun, Zhou Jinsong, Yin Xiao, Li Yuanyuan, Liu Peng, Ding Li, Liang Yongxing. Application of Microbial Geochemical Exploration Technology in Oil and Gas Exploration in Loess Tableland Regions[J]. Special Oil & Gas Reservoirs, 2020, 27(5): 53-60.

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