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Method for estimating mechanical parameters of diagenetic natural gas hydrate reservoir

A technology for mechanical parameters and hydrates, which is applied in geophysical measurements, instruments, soil testing, etc., and can solve problems such as the inability to obtain mechanical parameters of hydrate reservoirs.

Inactive Publication Date: 2019-01-15
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0086] In view of the above prior art, the purpose of the present invention is to provide a method for predicting the mechanical parameters of diagenetic gas hydrate reservoirs, to solve the problem that the mechanical parameters of hydrate reservoirs cannot be obtained in the absence of detailed logging data

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  • Method for estimating mechanical parameters of diagenetic natural gas hydrate reservoir

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[0116] The present invention is applicable to the case where the reservoir formation density, drilling fluid density, porosity, hydrate saturation and rock component percentage are known.

[0117] This paper takes Well DK-1 of diagenetic gas hydrate in the permafrost area of ​​Qilian Mountains as an example. Take the 142.9m-147.7m hydrate-containing well section of Well DK-1, and the formation density of this well section is 2.35g / cm 3 , the drilling fluid density is 1.22g / cm 3 , the average porosity is 3.45%, and the average hydrate saturation is 74.58%. The volume fractions of rock components are shown in Table 1.

[0118] Table 1. Volume fraction of rock components in Well DK-1

[0119] rock composition

[0120] The diagenetic gas hydrate is regarded as pore filling and occurs (mode I), and the bulk modulus K of the reservoir rock (excluding hydrate) is calculated nwith shear modulus G n .

[0121] (37)

[0122] In the formula: K n is the bulk modulus of...

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Abstract

A method for predicting mechanical parameters of diagenetic natural gas hydrate reservoirs. The invention relates to the prediction field for mechanical parameters of diagenetic natural gas hydrate reservoirs, and solves the problem that reservoir mechanical parameters cannot be calculated for diagenetic natural gas hydrate reservoirs in the absence of detailed logging data. The invention mainly comprises estimating the longitudinal wave velocity of the natural gas hydrate reservoirs in the case of the hydrate saturation of the existing natural gas hydrate well, the overall density of the reservoir rock, and the density of the drilling fluid, and then calculating the reservoir mechanical parameters of the reservoirs. The invention is useful for predicting reservoir mechanical parameters ofdiagenetic gas hydrate reservoirs in the absence of detailed logging data.

Description

technical field [0001] The invention relates to the field of calculation of mechanical parameters of diagenetic natural gas hydrate reservoirs, in particular to a method for quickly predicting the mechanical parameters of diagenetic natural gas hydrate reservoirs. technical background [0002] Generally, to determine the reservoir mechanical parameters of diagenetic gas hydrate, it is necessary to obtain P- and S-wave velocity, formation density, overlying strata pressure, and drilling fluid column pressure based on well logging data. Geophysical logging is required to obtain compressional and shear wave velocities, but the cost of geophysical logging for diagenetic gas hydrate reservoirs is relatively high. On the premise of clarifying the rock components, hydrate saturation, pore water saturation, hydrate porosity, and overall rock density in the hydrate reservoir, combine the Gassmann equation to estimate the shear wave velocity and compression wave velocity, and then est...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24G01V9/00
CPCG01N33/24G01V9/00
Inventor 范翔宇王昭翔赵鹏斐
Owner SOUTHWEST PETROLEUM UNIV
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