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Determining method of gas saturation in gas reservoir

A technology for determining method and saturation, applied in earthwork drilling and production, wellbore/well components, etc., can solve the problems affecting the prediction of natural gas geological reserves and the inability to accurately determine the gas saturation of ultra-low porosity and ultra-low permeability sandstone gas reservoirs, etc.

Active Publication Date: 2015-02-18
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for determining ultra-low porosity and ultra-low permeability sandstone gas reservoirs in view of the above-mentioned prior art methods tha

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  • Determining method of gas saturation in gas reservoir
  • Determining method of gas saturation in gas reservoir
  • Determining method of gas saturation in gas reservoir

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Embodiment Construction

[0027] The continental Xujiahe Formation of Sinopec Puguang Gas Field is an ultra-low porosity and ultra-low permeability gas reservoir, with an average porosity of about 2.5% and a permeability of 0.01-0.04mD. The rocks are dense and have poor physical properties. The present invention takes Pulu 1 Well of Sinopec Puguang Gas Field in this gas reservoir as an example, and selects rock samples from Reinjection 1 Well of Puguang Gas Field and Puguang 3011-5 Well of Puguang Gas Field, which belong to the same type of reservoir, and combines the accompanying drawings to analyze the present invention. The embodiment of the invention is described in further detail, and the specific steps of the present invention are as follows:

[0028] 1. Screening of analytical samples and analytical data of analytical samples:

[0029] 1.1 Screening of rock samples:

[0030] figure 2 It is a comparison chart of conventional logging, imaging logging interpretation data and core data analysis o...

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Abstract

The invention relates to a determining method of the gas saturation in a gas reservoir, and belongs to the technical field of unconventional exploration and development of gas reservoirs. The influences of geological factors such as the gas reservoir type, the reservoir characteristics and the fluid distribution under the actual gas reservoir condition are considered, the gas-drive-water process in a gas reservoir is simulated in a lab, analytic samples are screened through the collection of rock samples with complex pore structures in the very low porosity and permeability gas reservoir, the analytic data of the analytic samples are determined, the relation between the water saturation Sw and the average capillary pressure of the analytic samples and the relation between the water saturation Sw and the average capillary pressure of the gas reservoir are established in the lab, and according to the relation between the height H of a gas column above a free water surface of the very low porosity and permeability gas reservoir and the water saturation Sw, the gas saturation Sg of the very low porosity and permeability gas reservoir is determined economically and accurately.

Description

technical field [0001] The invention relates to a method for determining the gas saturation of a gas reservoir, in particular to a method for determining the gas saturation of an ultra-low porosity and ultra-low permeability sandstone gas reservoir, and belongs to the technical field of exploration and development of unconventional gas reservoirs. Background technique [0002] The ultra-low porosity and ultra-low permeability sandstone unconventional gas reservoir has an average porosity of about 2.5% and a permeability between 0.01-0.04mD. Large, with developed cracks and strong heterogeneity. Therefore, the pore structure is complex and the degree of gas content varies greatly, making it difficult to accurately determine the gas saturation of the gas reservoir. [0003] The existing methods for determining the gas saturation of sandstone reservoir gas reservoirs mainly include the following three methods: [0004] 1. Rock-electricity experimental analysis method: the gas...

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Application Information

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IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 赵兴涛国殿斌苏惠汤彬顾勤王兴武常洪卫韩圆庆刘淑
Owner CHINA PETROLEUM & CHEM CORP
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