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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摘要

塔里木盆地玉北地区地质条件复杂,地表为沙漠地貌,多流动沙丘,地震信号因沙漠地表吸收衰减严重,资料信噪比和分辨率低,勘探难度大。油气化探的活动态方法不受沙漠区影响,可以探测下伏的油气信息,具有直接、快速、经济的特点。选择游离气、顶空气、荧光光谱、微生物等活动态方法在塔里木盆地玉北地区进行勘探应用。应用结果表明:活动态方法中甲烷氧化菌、丁烷氧化菌等微生物指标异常区及综合指标(熵值)异常区可有效指示玉北1井区的油气范围;依据这些指标异常的空间组合及配置关系在研究区圈定了6个化探异常有利区,同时划分了它们的综合异常级别,其中玉北1号构造破裂带是本工区油气勘探最有利的目标区,玉北1号构造破裂带边缘区亦是本工区油气勘探较有利的目标区。上述结果为塔里木盆地玉北地区油气勘探部署提供了地球化学依据。

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	李武
	王国建
	蒋涛
	邹雨
	罗昕
	郭嘉琪
	汤玉平
	陈浙春

关键词 ：油气化探, 活动态指标, 微生物, 地球化学异常, 有利区, 玉北地区

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

收稿日期: 2021-03-04 修回日期: 2021-08-31 出版日期: 2022-04-20

ZTFLH:

TE132.1

基金资助:国家自然科学基金项目“近地表轻烃来源判识模型及其油气勘探应用基础研究”(41872126)

作者简介: 李武(1965-),男,博士,高级工程师,主要从事油气地球化学勘探与石油地质研究工作。 Email: liwu.syky@sinopec.com

引用本文:

李武, 王国建, 蒋涛, 邹雨, 罗昕, 郭嘉琪, 汤玉平, 陈浙春. 塔里木盆地玉北地区活动态油气化探指标应用效果分析[J]. 物探与化探, 2022, 46(2): 296-303.
LI Wu, WANG Guo-Jian, JIANG Tao, ZOU Yu, LUO Xin, GUO Jia-Qi, TANG Yu-Ping, CHEN Zhe-Chun. Application of the mobile form indicators ingeochemical prospecting of hydrocarbons in Yubei area, Tarim Basin. Geophysical and Geochemical Exploration, 2022, 46(2): 296-303.

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https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2022.1115 或 https://www.wutanyuhuatan.com/CN/Y2022/V46/I2/296

Fig.1 研究区地质构造与井位分布

Fig.2 化探样品采集剖面部署

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

Table 1 YB1井构造区化探指标数据统计

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

Table 2 玉北地区化探指标相关矩阵

Fig.3 研究区化探指标聚类谱系

Fig.4 玉北井区YB7—YB5—YB9地质剖面示意与化探指标投影线对比

Fig.5 玉北井区YB1-1X—YB1-7地质剖面示意及甲烷氧化菌等指标线对比

Fig.6 玉北工区化探异常区块评价

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