1. Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, China 2. National Center for Geological Exploration Technology, Langfang 065000, China 3. Electromagnetic Detection Technology Key Laboratory of Natural Resources, Langfang 065000, China 4. Shenyang Center of Geological Survey,CGS,Shenyang 110034,China
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.
彭炎, 张小博, 张健, 张鹏辉, 袁永真, 姜春香. 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[J]. 物探与化探, 2020, 44(3): 656-664.
Yan PENG, Xiao-Bo ZHANG, Jian ZHANG, Peng-Hui ZHANG, Yong-Zhen YUAN, Chun-Xiang JIANG. The application of magnetotelluric sounding method to oil-gas geological survey and evaluation of the western slope area of Binbei. Geophysical and Geochemical Exploration, 2020, 44(3): 656-664.
Xia X Y, Wang J X, Liu J C, et al. The application of magnetotelluric sounding to lithofacies division in oil and gas explo ration of northern nanpangjiang area[J]. Geophysical and Geochemical Exploration, 2012,36(2):174-179.
Zhang J, Bian X F, Chen S W, et al. Shale gas resources prospect of late Permian Linxi Formation in the middle-southern part of the Da Hinggan Mountains[J]. Geological Bulletin of China, 2013,32(8):1297-1306.
Su F, Bian X F, Wang Q H, et al. The evaluation of hydrocarbon generation potential of source rocks in Linxi Formation of Zhalute basin, Inner Mongolia[J]. Geological Bulletin of China, 2013,32(8):1307-1314.
Cai J T, Chen X B. Refined techniques for data processing and two-dimensional inversion in magnetotelluric Ⅱ:Which data polarization mode should be used in 2D inversion[J]. Chinese Journal of Geophysics, 2010,53(11):2703-2714.
Chen X B, Guo C L. Refined techniques for data processing and two-dimensional inversion in magnetotelluric(Ⅴ):Detecting the linear structures of the Earth by impedance tensor imaging[J]. Chinese Journal of Geophysics, 2017,60(2):766-777.
Chen X B, Cai J T, Wang L F, et al. Refined techniques for magnetotelluric data processing and two-dimensional inversion(IV):Statistical image method based on multi-site,multi-frequency tensor decomposition[J]. Chinese Journal of Geophysics, 2014,57(6):1946-1957.
McNeice G W, Jones A G. Multisite, multifrequency tensor decomposition of magnetotelluric data[J]. Geophysics, 2001,66(1):158-172.
Ye T, Chen X B, Yan J L. Refined techniques for data processing and two-dimensional inversion in magnetotelluric(Ⅲ):using the Impressing Method to construct starting model of 2D magnetotelluric inversion[J]. Chinese Journal of Geophysics, 2013,56(10):3596-3606.
Wannamaker P E, Hohmann G W, Ward S H, et al. Magnetotelluric responses of three-dimensional bodies in layered earths[J]. Geophysics, 1984,49(9):1517-1533.
Berdichevsky M N, Dmitriev V I, Pozdnjakova E E, et al. On two-dimensional interpretation of magnetotelluric soundings[J]. Geophysical Journal International, 1998,133(3):585-606.
Zhang P H, Zhong Q, Fang H, et al. A study of the structure of southern Tuquan Basin and oil-gas prospect based on magnetotelluric sounding[J]. Geophysical and Geochemical Exploration, 2015,39(6):1284-1291.