Reservoir Characteristics and Development Model of Subaqueous Pyroclastic Rocks in a Continental Lacustrine Basin: A Case Study of the Chaganhua Subsag in the Changling Fault Depression, Songliao Basin

Yunqian Shi, Jian Yi, Weihua Bian, Xuanlong Shan (), Yuhu Liu, Guoli Hao, Ang Li, Qinglei Leng, Junjie Lu, He Pang and Ruichen Zhang
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Yunqian Shi: College of Earth Science, Jilin University, Changchun 130061, China
Jian Yi: College of Earth Science, Jilin University, Changchun 130061, China
Weihua Bian: College of Earth Science, Jilin University, Changchun 130061, China
Xuanlong Shan: College of Earth Science, Jilin University, Changchun 130061, China
Yuhu Liu: Northeast Oil and Gas Branch, SINOPEC, Changchun 130061, China
Guoli Hao: College of Earth Science, Jilin University, Changchun 130061, China
Ang Li: College of Earth Science, Jilin University, Changchun 130061, China
Qinglei Leng: Northeast Oil and Gas Branch, SINOPEC, Changchun 130061, China
Junjie Lu: College of Earth Science, Jilin University, Changchun 130061, China
He Pang: College of Earth Science, Jilin University, Changchun 130061, China
Ruichen Zhang: College of Earth Science, Jilin University, Changchun 130061, China

Energies, 2023, vol. 16, issue 13, 1-31

Abstract: Industrial oil and gas eruptions underwater have been found in the pyroclastic rocks of the Huoshiling Formation in the continental lacustrine basin of the Changling fault depression, Songliao Basin. This paper investigates the reservoir space characteristics, physical characteristics, and pore structure differences of subaqueous pyroclastic reservoirs in the Huoshiling Formation, and the causes of physical property differences of different types of reservoirs and their formation and evolution processes are analyzed. (1) The content of volcanic glass in tuff is higher, the reservoir space is dominated by devitrification pores and dissolution pores, and the coarser the grain size, the more favorable the physical properties, with larger pore sizes and higher porosities. The content of clay minerals in sedimentary tuff is high, the pores between clay minerals are the main pores, and the physical properties of sedimentary tuff are poor. The content of soluble components such as feldspar, debris, and laumontite is high in tuffaceous sandstone, which is dominated by dissolution pores. (2) Primary pores are not developed in the pyroclastic reservoirs in the study area, and the reservoirs are relatively dense, with an average porosity of 2.43% and an average permeability of 0.076 mD. The coarse-grained tuff has the highest porosity, followed by tuffaceous sandstone and fine-grained tuff, and the sedimentary tuff has the least favorable physical properties. (3) Devitrification was an important cause of the high-porosity and ultralow permeability of tuff reservoirs. Two oil and gas charges in the middle diagenetic stage led to the organic acid dissolution of rocks. In addition, fractures can provide migration channels for organic acids and deep hydrothermal fluids, leading to late dissolution, and can connect various scattered dissolution pores to improve the effectiveness of the reservoir space. (4) Coarse-grained tuff reservoirs that developed in the proximal facies are favorable targets for hydrocarbon exploration.

Keywords: Songliao Basin; Changling fault depression; continental lacustrine basin; subaqueous eruption; pyroclastic rock reservoir; reservoir development pattern (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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