Cai Zhenjing, 1989. "High-precision Aeromagnetic Surveys for Structural Mapping in Oil Prospecting", An Overview of Exploration Geophysics in China — 1988, Zhao Jingxiang, Wang Yanjun, Fu Xuexin, Stanley H. Ward
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In order to give full play to the role of airborne geophysics in the second generation reconnaissance for petroleum, aeromagnetic surveying using high accuracy optically pumped magnetometers was conducted in 1982 over an area of 60 000 km2 within the central depression of the Songliao Basin (at 1:20 000 scale, with spacing 2 km × 20 km).
The results of this primarily aeromagnetic project, supported by petrophysical determinations from core samples, were analyzed along with available seismic and gravity data from the area, and the following important geologic observations are derived.
A total of 147 small local anomalies were detected, and many details and subtle changes in the magnetic field were indicated. As shown by the analyses of seismic and geologic data from boreholes, most of these features are responses from geologic structures.
A series of magnetic formations are indicated in the sedimentary cover, most of which are defined as local structures.
A number of secondary structures are delineated within the shallow zones. Similarly, some sedimentary centers can also be delineated in the depression zones, such as the Gulong depression, and Daán depression, and the Heidimiao depression.
More than 50 fault lines are defined. Most of these faults are known, but eight of them are located on the basis of the present aeromagnetic survey.
Some preliminary studies were attempted in direct finding of oil and gas based on high sensitivity aeromagnetic data.
The present study shows that by applying high sensitivity aeromagnetic measurements in areas where extensive investigations have already been conducted, it is possible to obtain new geological information, and to open up new prospects in the search for oil and gas.