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APPLICATION OF NATURAL GAMMA-RAY SPECTROMETRY LOGGING IN THE LOWER SHAHAI FORMATION IN FUXIN BASIN:A Case Study of LFD-2 Well |
ZHANG De-jun1,2, ZHANG Xiao-chuan3, ZHAO Hong-wei1, CHEN Shu-wang1, ZHANG Jian1 |
1. Shenyang Center of China Geological Survey, Shenyang 110034, China; 2. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China; 3. Liaoning Geology and Mineral Survey Institute Co., Ltd., Shenyang 110032, China |
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Abstract The oil-gas survey and exploration in Fuxin Basin has a long history. Despite quite a few oil-gas discoveries and even low production obtained from some wells in the beginning, none of them have sustainable and stable production. In 2017, high-yield industrial oil flow was obtained from LFD-2 well in the Lower Shahai Formation of Fuxin Basin, with a daily production of 15.3 m3, achieving a major breakthrough in oil-gas survey and exploration. To further study the stratigraphic characteristics of Lower Shahai Formation in Fuxin Basin, the natural gamma-ray spectrometry logging data are used to analyze the shale content, clay mineral type and sedimentary environment of Lower Shahai Formation in LFD-2 well, which ascertains the shale content and its variation. It is concluded that the Lower Shahai Formation was formed in a sedimentary environment of interactions between oxidation and weak reduction, with weak hydrodynamic conditions (mainly low energy). The study provides a basis for further understanding of the reservoir characteristics of Lower Shahai Formation and contributes to the following oil-gas exploration and theoretical research in Fuxin Basin.
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Received: 30 November 2020
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