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- Title
四川盆地及其周缘海相页岩有机质炭化区分布规律与主控因素浅析.
- Authors
王玉满; 魏国齐; 沈均均; 邱振; 李新景; 张琴; 张磊夫; 王灿辉; 刘雯
- Abstract
The distribution and main controlling factors of organic matter carbonization points (zones) of over-mature marine shale are important issues for shale gas exploration.This paper focuses on the Lower Cambrian and Lower Silurian shale in the Sichuan Basin and its periphery.Based on the detailed anatomy of key carbonization areas, predictions of shale organic matter carbonization areas and regional mapping of thermal maturity are carried out to explore and reveal the distribution and main controlling factors of the carbonization zones of organic matter in the two sets of shales.Four preliminary conclusions were obtained:(1) In the Lower Silurian shale distribution area,there are four organic matter carbonization zones,namely,eastern Sichuan-western Hubei, nor-thwestern Hubei,southern Sichuan and Renhuai-southwestern Chongqing,covering an area of nearly 40 000 km²,of which the main part of the western carbonization zone in southern Sichuan is located in the Emei basalt distribution area. (2) In the Lower Cambrian shale distribution area, the organic carbonization area accounts for more than 80%.The non-carbonization area is only distributed in Weiyuan-Ziyang, Moxi-Gaoshiti, Changyang and Weng'an-Zhenyuan with an area of about 62 600 km². (3) The Emei igneous rock event was an extreme heat event in the Late Permian, which increased the thermal maturity RO value of the Lower Silurian and Lower Cambrian shale in the western part of southern Sichuan by 0.2%-0.4% and 0.2%-1.0%, respectively.Mabian-Ebian is located in the high-value area of the Emei basalt thickness, and is also the area with the highest degree of carbonization of organic matter in the Lower Cambrian and Lower Silurian shale. (4) The main controlling factors of organic matter carbonization of the Lower Cambrian and Lower Silurian shale have similarities and differences.The main controlling factor of the former is the long-term deep burial background, and the extremely thermal event in the Late Permian only made the degree of carbonization in some areas more serious.The latter’s main controlling factors are relatively complex, and are controlled by deep burial background in the three regions of Renhuai-southwestern Chongqing, eastern Sichuan-western Hubei, and northwestern Hubei.In western Sichuan, it was controlled by deep burial background and high ground temperature in Late Permian.
- Subjects
SICHUAN Sheng (China); HUBEI Sheng (China); CHONGQING (China); HEAT waves (Meteorology); SHALE gas; IGNEOUS rocks; OIL shales; EARTH temperature; CARBONIZATION
- Publication
Natural Gas Geoscience, 2022, Vol 33, Issue 6, p843
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2022.01.016