塔里木盆地玉北地区活动态油气化探指标应用效果分析

doi:10.11720/wtyht.2022.1115

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Abstract

The Yubei area in Tarim Basin is characterized by complex geological conditions and desert land form with widely distributed mobile sand dunes. Seismic signals are severely attenuated in the area due to the absorption by desert surface, leading to a low signal-noise ratio and low resolution of data and thereby making hydrocarbon exploration difficult. The method using mobile forms for geochemical prospecting of hydrocarbons is not affected by the desert land form and can detect information of underlying hydrocarbons in adirect, rapid, and economic manner. The mobile form indicators of free hydrocarbon gas, headspace gas, fluorescence spectra, and microorganisms were selected for the geochemical prospecting of hydrocarbons in the Yubei area, Tarim Basin. The results are as follows. The anomaly zones of the methane,butane oxidizing bacteria and the integrated indicators (entropy) can effectively indicate the hydrocarbon-bearing scope of the area controlled by Well Yubei-1. Based on the spatial combination and configuration relationship of the anomaly zones of these indicators, six favorable zones of geochemical anomalieswere delineated, and their integrated anomalous levels were determined. Among these favorable zones, the tectonoclastic zone of Well Yebue-1 is the most favorable target area for hydrocarbon exploration, followed by the marginal regions of the tectonoclastic zone. These results provide a geochemical basis for further deployment of hydrocarbon exploration in the Yuebei area, Tarim Basin.

Key words： geochemical exploration of hydrocarbons geochemical indicator of mobile forms microorganism geochemical anomaly favorable zone Yubei area

Received: 04 March 2021 Published: 28 June 2022

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	Articles by authors
	Wu LI
	Guo-Jian WANG
	Tao JIANG
	Yu ZOU
	Xin LUO
	Jia-Qi GUO
	Yu-Ping TANG
	Zhe-Chun CHEN

Cite this article:

Wu LI,Guo-Jian WANG,Tao JIANG, et al. Application of the mobile form indicators ingeochemical prospecting of hydrocarbons in Yubei area, Tarim Basin[J]. Geophysical and Geochemical Exploration, 2022, 46(2): 296-303.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1115 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I2/296

Geological structure and well location distribution in the study area

Distribution of the sampling profiles in the geochemical exploration

参数	BOB/(CFU·10⁸)	MOB/(CFU·10⁸)	F360/int	$YC 2 +$ /(μL·L^-1)	YC₁/(μL·L^-1)	WC₁/(μL·L^-1)	W $C 2 +$ /(μL·L^-1)
C	0.91	3.43	28.43	0.64	4.41	5.52	0.26
S	4.33	9.16	45.35	0.70	2.51	1.30	0.10
V	4.75	2.67	1.59	1.09	0.56	0.23	0.38

Data statistics of the geochemical indicators used in the structure zone in Well Yubei-1 area

指标	WC₁	$WC 2 +$	YC₁	$YC 2 +$	MOB	BOB	F360
WC₁	1.000
$WC 2 +$	0.205	1.000
YC₁	0.211	-0.015	1.000
$YC 2 +$	0.078	0.022	0.576	1.000
MOB	0.072	0.087	-0.049	-0.096	1.000
BOB	-0.019	0.040	-0.056	-0.038	0.061	1.000
F360	-0.065	-0.048	-0.060	-0.064	0.036	0.056	1.000

Correlation matrix of the geochemical indicators used in Yubei area

Diagram showing the clustering spectrums ofthe geochemical indicators used in the study area

Schematic diagram showing the YB7—YB5—YB9 geological profiles in Well Yubei area and anomaly distribution of the geochemical indicators

Schematic diagram showing the YB1-1X—YB1-7 geological profile in Well Yubei area and anomaly distribution of the geochemical indicators

Evaluation result of the geochemical anomalous zones in Yubei study area

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