Evaluation of Fracability of Volcanic Reservoir in Deep Gas Reservoirs of Wangfu Fault Depression

doi:10.7657/XJPG20200317

Abstract

Abstract:

The volcanic rocks in the deep gas reservoir of Wangfu fault depression are characterized by deep burial and poor physical properties, so the conventional production methods cannot get good effects and it is need to carry out fracturing stimulation in this kind of reservoirs. Taking the volcanic rock in the deep gas reservoir in Wangfu fault depression as the research object and based on rock mechanics experiment and acoustic emission test, the fracture making ability and fracability of the reservoir are comprehensively evaluated by combining the anisotropy, brittleness, stress sensitivity, natural fracture density and acoustic emission activity of the rock. The results show that the volcanic rocks in the deep gas reservoir of Wangfu fault depression have high content of brittle minerals and high compressive strength; the elastic wave velocity of the rock varies a lot, the stress sensitivity is different and the anisotropy of natural fractures is weak; the reservoir is sensitive to fluids and the fluid fracture making ability are relatively strong when distilled water and KCl solution with the mass fraction of 15% are used. The comprehensive evaluation of reservoir fracability can provide theoretical guidance for the optimization of fracturing horizon and fracturing fluid and design of fracturing plan, meanwhile provide basis for exploration and development of the deep gas reservoirs in Wangfu fault depression.

Key words: Wangfu fault depression, deep gas reservoir, volcanic rock, fracability, fracturing, mechanical property, natural fracture, fracture making ability

CLC Number:

TE112.24

LIU Guangyu, WANG Weiming, WANG Yanling. Evaluation of Fracability of Volcanic Reservoir in Deep Gas Reservoirs of Wangfu Fault Depression[J]. Xinjiang Petroleum Geology, 2020, 41(3): 359-364.

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