油气微生物对顺北断溶体油藏的近地表响应

doi:10.11720/wtyht.2022.1060

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Abstract

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.

Key words： Shunbei area fault-karst reservoir microbial prospecting near-surface response application prospect

Received: 25 February 2021 Published: 21 June 2022

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	Fei CAO
	Min YANG
	Dian BAO
	Yin-Jie CHEN
	Guo-Jian WANG

Cite this article:

Fei CAO,Min YANG,Dian BAO, et al. Near-surface response of hydrocarbon-consuming microorganisms to the fault-karst reservoirs in Shunbei oil and gas field[J]. Geophysical and Geochemical Exploration, 2022, 46(3): 678-684.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1060 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I3/678

Bitmap of seismic interpretation and microbial exploration sampling points in Shunbei study area

Comparison table of characteristic values of microbial indexes in different landforms

Comparison of microbial characteristic values between farmland and desert landform areas

Comparison table of microbial structure characteristics between farmland and desert

Histogram of microbial structure characteristics in different geomorphologic areas

Isoline map of microbial index plane in Shunbei study area
a—methane oxidizing bacteria;b—butane oxidizing bacteria

Comparison between the core area and the periphery of the Shunbei 5 fault zone

Comparison table of characteristic values between the core area and peripheral indexes of the Shunbei 5 fault zone

Planar contour map of microbial fluctuation rate in Shunbei study area
a—methane oxidizing bacteria;b—butane oxidizing bacteria

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