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.
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doi: 10.11720/wtyht.2015.6.31
Fang H, Zhong Q, Chen S W. The discovery of two conductive layers in Tuquan basin,Inner Mongolia,and its geological significance[J]. Geological Bulletin of China, 2013,32(8):1253-1259.