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- Title
松南长岭断陷查干花次凹火石岭组火山碎屑岩 储层特征及主控因素.
- Authors
钟高明; 赵向原; 石 磊; 赵密福; 孙 楠; 吴 冷; 蔡 潇; 夏 威; 于 涛
- Abstract
The mineral and rock composition and fabric of the alkaline volcanic clastic rock reservoir in the Chaganhua sub-sag of the Changling Fault Depression in the southern Songliao Basin are complex, and the genetic mechanism, diagenesis, and main controlling factors of the reservoir are unclear, which restricts the prediction and fine characterization of high-quality reservoirs and affects the further efficient development of gas reservoirs. Through microscopic observation, whole rock mineral analysis, mercury intrusion, and nano CT scanning, combined with special logging, this article systematically analyzes the petrological characteristics, volcanic lithofacies characteristics, reservoir microscopic characteristics, and fracture characteristics. It is believed that there are seven main types of diagenesis in the area, including devitrification, dissolution, and alteration. Based on this, the main controlling factors for the development of volcanic clastic rock reservoirs in the Chaganhua subsag are clarified. It is believed that the volcanic detrital rocks in this area belong to sodium rich alkaline volcanic rocks, and the type, mineral composition, and rock particle size of the detrital rocks are the material basis for determining the quality of the reservoir. In the later stage, three different types of secondary pores are generated through devitrification, dissolution, and alteration. At the same time, a large number of natural fractures generated by tectonic stress are conducive to the formation of secondary pores, which improves and communicates the microscopic seepage of the reservoir. The formation of a reservoir with the characteristics of "three pores and one fracture" and a unique microscopic seepage field has certain guiding significance for the evaluation and dessert prediction of sodium rich alkaline volcanic clastic rock reservoirs, laying a solid foundation for the subsequent efficient development of gas reservoirs.
- Subjects
CLASTIC rocks; VOLCANIC ash, tuff, etc.; DIAGENESIS
- Publication
Natural Gas Geoscience, 2024, Vol 35, Issue 1, p84
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2023.09.003