Near-surface response of hydrocarbon-consuming microorganisms to the fault-karst reservoirs in Shunbei oil and gas field
CAO Fei1(), YANG Min1, BAO Dian1, CHEN Yin-Jie2, WANG Guo-Jian2
1. SINOPEC Northwest Oilfield Company,Urumqi 830011,Chian 2. Wuxi Research Institute of Petroleum Geology,Research Institute of Exploration and Production,SINOPEC,Wuxi 214126,China
As an ultra-deep fault-karst reservoir located in the Tarim Basin of Xinjiang,the Shunbei oil and gas field prosses the characteristics of the large burial depth and fault development in the target formations.This oil and gas field is difficult to explore due to the low signal-to-noise ratio and low resolution of seismic signal data since seismic signals are absorbed by the desert surface and thereby suffer severe attenuation.The microbial prospecting developing based on the theory of vertical hydrocarbon microseepage can detect the oil and gas-bearing properties of fault zones.This technology,combined with geophysical exploration,can improve the success rate of the prediction of the oil and gas-bearing properties of fault zones.This experimental study of microbial prospecting in fault zone No.5 in the Shunbei oil and gas field shows that the abundance anomalies of hydrocarbon-consuming microorganisms show good near-surface response to fault-karst reservoirs.Compared to areas with vegetation,hydrocarbon-consuming microorganisms (including methane- and butane-oxidizing bacteria) as indicators of microbial prospecting in desert areas are characterized by low measured values and slight fluctuation.However,hydrocarbon-consuming microorganisms can better reflect the near-surface information induced by the vertical microseepage of deep-buried oil and gas since they are less disturbed by other microbial communities due to the special ecological conditions in desert areas.According to the application results,the high-amplitude anomalies of both methane- and butane-oxidizing bacteria are primarily distributed in the vicinity of fault zone No.5,and favorable anomalies also occur in the vicinity of fault zone No.1 in the Shunbei oil and gas field.Furthermore,the strike of these anomalies roughly coincides with that of fault zones,indicating that the microbial anomaly zones correlate strongly with fault-karst reservoirs.Therefore,the microbial prospecting for hydrocarbons has great application prospects in the exploration of the fault-karst reservoirs.
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CAO Fei, YANG Min, BAO Dian, CHEN Yin-Jie, WANG Guo-Jian. Near-surface response of hydrocarbon-consuming microorganisms to the fault-karst reservoirs in Shunbei oil and gas field. Geophysical and Geochemical Exploration, 2022, 46(3): 678-684.
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