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A method and device for obtaining the total porosity of a shale gas reservoir
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A technology of total porosity and acquisition method, applied in measuring devices, suspension and porous material analysis, instruments, etc., can solve the problems of high cost, poor stability, long cycle, etc., and achieve the effect of improving reliability and precision
Inactive Publication Date: 2019-05-17
CHINA UNIV OF GEOSCIENCES (WUHAN)
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[0004] The invention provides a method and device for obtaining the total porosity of shale gas reservoirs, which solves the technical problems in the prior art that the total porosity measurement process of shale gas reservoirs is complicated, the cycle is long, the stability is poor, and the cost is high
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Embodiment 1
[0105] see figure 1 , in this embodiment, a method for calculating the total porosity of shale gas reservoirs using logging data is provided, including:
[0106] Step S101, obtaining the bulk modulus K of each mineral in the shale gas reservoir i And each mineral content f i ;
[0107] Step S102, obtaining the mineral density ρ of the shale gas reservoir i And each mineral content f i ;
[0108] Step S103, obtaining the shear wave velocity Vs of the acoustic wave in the saturated state of the shale gas reservoir saturated , the density ρ of the shale gas reservoir in the saturated state saturated ;
[0109] Step S104, obtaining the conversion coefficient C of the sound wave propagating in the fluid of the shale gas reservoir, and the longitudinal wave velocity V of the sound wave in the saturated state of the shale gas reservoir p , the propagation speed V of sound wave in natural gas gas ;
[0110] Step S105, calculating the bulk modulus K of each mineral in the sha...
Embodiment 2
[0139] In this embodiment, a device for calculating the total porosity of shale gas reservoirs using logging data is provided, the device comprising:
[0140] The first acquisition unit is used to acquire the density ρ of each mineral in the shale gas reservoir i , the bulk modulus K of each mineral i And each mineral content f i , Density ρ of shale gas reservoir under saturated state saturated , Obtain the shear wave velocity Vs of the sound wave in the saturated state of the shale gas reservoir saturated ;
[0141] The second acquisition unit is used to acquire the conversion coefficient C and the longitudinal wave velocity V of the acoustic wave propagating in the fluid of the shale gas reservoir p , the propagation speed V of sound wave in natural gas gas ;
[0142] Acoustic wave propagation speed calculation unit in particles, used to calculate K matrix Divide the sum of 4 / 3 times μ by ρ matrix Calculate the propagation velocity Vp of the acoustic wave in the sha...
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Abstract
The invention belongs to the technical field of geological prospecting, and discloses a method for obtaining the total porosity of a shale gas reservoir. The method comprises the following steps: obtaining a rock density pmatrix of the shale gas reservoir; obtaining a dry rock bulk modulus Kmatrix of the shale gas reservoir; acquiring a dry rock shear modulus mu of the shale gas reservoir; calculating a transmission speed Vpmatrix of sound waves in particles of the shale gas reservoir according to a formula; calculating the total porosity phi of the shale gas reservoir by adopting a method for calculating the porosity by using the sound waves according to the transmission speed Vpmatrix of the sound waves in the particles of the shale gas reservoir. The method provided by the invention can realize high-precision and high-efficiency porosity measurement.
Description
technical field [0001] The invention relates to the technical field, in particular to a method and device for obtaining the total porosity of shale gas reservoirs. Background technique [0002] The total porosity of shale gas reservoirs refers to the ratio of the volume of all pores in the rock sample to the total volume of the rock sample, or absolute porosity, which can be expressed as a percentage. The pores in shale gas reservoirs are mostly nano-scale pores, and the types of pores are diverse, mainly divided into organic pores, inorganic pores and micro-fractures, which are the main space for shale gas storage. In the process of shale gas exploration and development, the total porosity of shale gas reservoirs is a key parameter for calculating shale gas reserves and formulating development plans. The calculation of total porosity in shale gas reservoirs is an important content of shale gas reservoir evaluation, and it is also the basis for selecting favorable drilling ...
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