| Borehole-surface technique is a kind of electric technique that the power source is located at borehole and electromagnetic fields are observed on ground. It is mainly used to delimit a known hydrocarbon reservoir and detect possible hydrocarbon-bearing blocks adjacent to the known reservoir. The technique originated from Russian and is regarded as an important and urgent technique for hydrocarbon exploration. The paper presents the research production on physical mechanism, acquisition method, data processing and interpretation, etc. about the technique. The main theoretical and application development and innovation obtained during the research is described as follows:1. The paper introduces the status quo of borehole-surface technique and its classification. For solve its deficiencies in Russian that the method records only horizontal electric component and studies IP phase difference and resistivity anomaly of only a definite frequency to decide its hydrocarbon-bearing nature, the author brings forward a new borehole-surface electric method, i.e. Borehole-surface Time-frequency Electromagnetic sounding method, and presents its field layout. And in the paper, author presents a thinking of improving precision, i.e. a way to study resistivity and polarizability anomalies of objective both in time domain and frequency domain simultaneously. It perfects the technique.2. Based on the former research fruit, the author brings forward the viewpoint that the mechanism of induced polarization detection is electrical charge and release effect of double electric interfaces between oil or water and host. And another viewpoint that anomalies (including resistivity and polarizability) due to reservoir can be described by a three-layer geo-electric anomaly pattern is brings forward, so author focuses on reservoir anomaly variation from shallow to deep and to value the hydrocarbon-bearing nature based on its whole anomaly distribution feature, which is important for exact...
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