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- Title
上扬子地区五峰组—龙马溪组黑色页岩高频层序划分 .
- Authors
赵少泽; 李 勇; 程乐利; 聂 舟; 王 同; 吴朝容; 耿茂宇
- Abstract
The Wufeng-Longmaxi formations in the Upper Yangtze Region are the most successful horizon of shale gas exploration and development in China. The high-frequency sequences division in the Wufeng-Longmaxi formations black shales is helpful to clarify the distribution of organic carbon. The Well N211 black shales were studied to determine Natural Gamma (GR) and total organic carbon content (TOC), and high-frequency sequences were divided based on cyclostratigraphy. The GR value and TOC gradually increase from the bottom of Wufeng Formation to the Guanyinqiao Member (maximum value appears in Guanyinqiao Member), gradually decrease from Guanyinqiao Member to Longmaxi Formation. Using GR spectrum analysis and its filter curve, about six and seven long eccentricity cycles were identified in the Wufeng and lower Longmaxi formations, respectively. The Wufeng and lower Longmaxi formations can be divided into 12 fourth order sequences and one incomplete fourth order sequence. This study can provide a typical case for high-frequency sequences division of black shales, and a reference for shale gas sweet spot prediction in the Wufeng-Longmaxi formations. In the shale high-frequency sequence structure of the Wufeng-Longmaxi formations, the black shales near the sequence boundary are relatively rich in organic matter.
- Subjects
CHINA; SHALE gas; OIL shales; NATURAL gas prospecting; SHALE; ORGANIC compounds; BLACK shales; CYCLOSTRATIGRAPHY
- Publication
Natural Gas Geoscience, 2022, Vol 33, Issue 11, p1808
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2022.07.004