大地电磁测深法在滨北西部斜坡带油气地质调查评价中的应用

doi:10.11720/wtyht.2020.0060

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Abstract

In recent years, more and more data show that the Songliao Basin has a large hydrocarbon generation potential and oil-gas resource prospect, and is expected to become the key stratigraphic horizon for the deep oil-gas exploration breakthrough in the Songliao Basin in the future. However, The distribution of the Carboniferous-Permian strata still has large uncertainties in terms of method, technology and understanding. In view of such a situation, the authors deployed a magnetotelluric sounding profile around the Heifudi- drill hole in the western slope zone of the Shenyang Geological Survey Center. The field parameters were used to optimize the acquisition parameters and thus high quality raw data were obtained. Through data analysis and conjugate gradient method, the electrical structural profiles were obtained and, in combination with drilling, seismic and other data, a comprehensive analysis was conducted. The results show that two horizontally stable low-resistance layers are developed near Heifudi-1 drill hole, and the first set of low-resistance layers is buried between 300 to 800 meters, which is the electrical property of the Cretaceous strata with high muddy content. In response, the second set of strata is located between 1.5 to 2.5km below the T5-Interface, and the lateral undulation is small. Combined with the drilling data, it is considered to reflect the mudstone strata of the Permian Linxi Formation. Combined with the main controlling factors of deep gas, the favorable zone of oil-gas has been predicted. These insights provide a reliable geophysical basis and technical reserve for the evaluation of the Carboniferous-Permian hydrocarbon resources in the Songliao Basin.

Key words： magnetotelluric sounding oil and gas resources evaluation Binbei area western slope area Linxi Formation

Received: 19 January 2020 Published: 24 June 2020

P631

Corresponding Authors: Xiao-Bo ZHANG E-mail: zhangxiaobo@igge.cn

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	Yan PENG
	Xiao-Bo ZHANG
	Jian ZHANG
	Peng-Hui ZHANG
	Yong-Zhen YUAN
	Chun-Xiang JIANG

Cite this article:

Yan PENG,Xiao-Bo ZHANG,Jian ZHANG, et al. The application of magnetotelluric sounding method to oil-gas geological survey and evaluation of the western slope area of Binbei[J]. Geophysical and Geochemical Exploration, 2020, 44(3): 656-664.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.0060 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I3/656

Structural map of western slope area(a), T5 interface contour map and survey line deployment(b)

Regional formation resistivity characteristics(a), Comparison of MT and resistivity logging curves in HFD1 (b)

Physical properties of study area

Comparison of original apparent resistivity and phase curve at the same measurement point for different durations

Poor raw apparent resistivity curve (a), Apparent resistivity curve after cross-reference processing(b)

A5 station raw apparent resistivity and phase curve

2D deviation (S) section

1~0.01 Hz electrical main axis direction of single station and multiple frequency(a),1~0.01 Hz electrical main axis direction of multiple station and multiple frequency(b)

RMS convergence curve

2D observation data section (top) and 2D inversion calculation section(below)

2D electrical structure profile and preliminary explanation

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