Fracture Development Characteristics and Main Controlling Factors of Carboniferous Volcanic Reservoir in Hongshanzui Oilfield

doi:10.3969/j.issn.1006-6535.2021.03.004

Abstract

Abstract: Carboniferous volcanic reservoir in Hongshanzui Oilfield is a typical pore-fractured dual media reservoir. Fracture is an important factor affecting hydrocarbon migration, accumulation, concentration and high yield, and also a key to restricting volcanic reservoir exploration in the study area. In order to achieve the efficient development of Carboniferous volcanic reservoirs, the main controlling factors affecting fracture development were identified based on the analysis of fracture characteristics of volcanic reservoirs, in combination with core, slice, and imaging logging data. The results showed that The fractures of Carboniferous volcanic rocks were mainly tectonic fracture, followed by diagenetic fracture and weathered fracture. Among tectonic fractures, high-angle fracture and low-angle oblique fracture were most developed. There were three groups of fractures in nearly east-west, northwest, and north-north east directions, dominated by small fractures and micro fractures, which were generated by different tectonic movements. The formation and distribution of fractures were controlled by lithology, weathered crust, faults and diagenesis. The difference in mineral composition of different lithological volcanic rocks resulted in different fracture types and pore-fracture combination modes. The difference in weathering intensity controlled the formation of weathered fracture and the development of dissolution fractures in the weathered crust. Fault activity affected the strike and distribution of associated fractures. The closer to the fault, the higher the density of fractures was. The early primary fractures were filled and reconstructed under the action of diagenesis, intensifying the fracture heterogeneity of volcanic reservoir. The study results play a guiding role in the effective development of Carboniferous volcanic reservoir in the northwestern margin of Junggar Basin.

Key words: fracture characteristics, influencing factors, Carboniferous, volcanic reservoir, tectonic movement, Hongshanzui Oilfield

CLC Number:

TE122.2

Zhang Xingyong. Fracture Development Characteristics and Main Controlling Factors of Carboniferous Volcanic Reservoir in Hongshanzui Oilfield[J]. Special Oil & Gas Reservoirs, 2021, 28(3): 25-32.

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