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Gypsum salt-carbonate reservoir rock supergene karst effect quantitative evaluation method and device

A carbonate and karst technology, applied in the field of quantitative evaluation of epigenetic karst effects in gypsum-carbonate reservoirs, can solve the problems of less quantitative evaluation research and more qualitative research

Active Publication Date: 2015-12-09
PETROCHINA CO LTD
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Problems solved by technology

[0004] However, there are few studies on the quantitative evaluation of the effect of karstification, especially the effect of epigenetic karstification on the pore diameter of gypsum-carbonate rock combination reservoirs, and more qualitative studies
Moreover, there is no report on the quantitative evaluation of the supergene karst effect of gypsum-carbonate rock combination reservoirs with different mineral compositions.

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Embodiment

[0065] The gypsum salt rock-carbonate rock symbiosis system has become an important reservoir type for the occurrence and accumulation of large oil and gas fields in the world, in which epigenetic karstification plays an important role in improving the reservoir performance. The gypsum salt-carbonate rock combination reservoir in the Ordos Basin is an important reservoir type of Ordovician gas reservoirs. Since the Paleozoic Ordovician to the Carboniferous about 120 million exposure environments have extensively developed epigenetic karstification, forming the paleogenetic karstification in the study area. The main pore type of the Zodiac gas layer is karst gypsum mold pores. How to quantitatively evaluate and calculate the karst effect of gypsum salt rock-carbonate rock combination, and analyze the changes of key parameters such as pore diameter, pore volume, and pore connectivity before and after dissolution will provide an accurate evaluation It provides a basis for predicti...

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Abstract

The invention provides a gypsum salt-carbonate reservoir rock supergene karst effect quantitative evaluation method and a device. The gypsum salt-carbonate reservoir rock supergene karst effect quantitative evaluation method comprises following steps: gypsum salt-carbonate rock composite samples with different gypsum and rock salt contents are selected; gypsum salt mineral and reservoir characteristics before karstification are detected; karst conditions are determined; a supergene karst test is carried out; gypsum salt mineral and reservoir characteristics after karstification are detected; porosity characteristics before and after corrosion are determined via a plurality of methods; gypsum and rock salt marked rock is used for evaluating reservoir characteristics before and after the supergene karst test; and supergene karst conditions are analyzed. The gypsum salt-carbonate reservoir rock supergene karst effect quantitative evaluation method is used for gypsum salt-carbonate special lithological combination, and is carried out based on real geological environments; a plurality of experiment laboratory facilities are adopted for evaluating gypsum salt-carbonate reservoir rock supergene karst effects; and pore diameter test data fusion algorithm is adopted so as to realize accurate quantification of supergene karst effects, and pore diameter nanometer range to millimeter range seamless quantitative evaluation before and after karsting.

Description

technical field [0001] The present invention relates to a method and device for quantitatively evaluating supergene karst effects of gypsum-carbonate reservoirs, in particular to a gypsum-carbonate rock based on a real geological environment with gypsum and halite as marker minerals The invention relates to a method and a device for quantitatively evaluating supergene karst effects of composite reservoirs, which belong to the technical field of karst research of gypsum salt rock-carbonate rock composite reservoirs in the field of petroleum geological research. Background technique [0002] With the successful development of ancient carbonate rock oil and gas in the world, the gypsum salt rock-carbonate rock symbiosis system has become an important reservoir type for the occurrence and accumulation of large oil and gas fields in the world, and karstification has become an important factor to improve the reservoir performance . Karstification mainly refers to the chemical pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
Inventor 白斌胡素云刘伟陶士振张宝民江青春张天舒
Owner PETROCHINA CO LTD
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