A method for obtaining gas content of shale reservoirs from well logging data

A technology for shale reservoirs and logging data, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., and can solve problems such as shale gas content error, gas loss, and large error in gas loss estimation results

Active Publication Date: 2017-10-13
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

In addition, during the drilling and coring process of shale gas wells, the gas loss is seriously affected by the coring method, and the gas loss accounts for 40-70% of the total gas content. The prediction of shale gas content by linear or nonlinear models may bring large errors

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  • A method for obtaining gas content of shale reservoirs from well logging data
  • A method for obtaining gas content of shale reservoirs from well logging data
  • A method for obtaining gas content of shale reservoirs from well logging data

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Embodiment Construction

[0062] The method for obtaining the gas content of shale reservoirs through logging data provided by the present invention comprises the following steps:

[0063] Step 1: Select a shale gas well in the study area for coring, and then measure the porosity of the same shale sample Organic carbon content TOC core , water saturation S w-core , cementation index m, saturation index n, Langmuir volume V L , Langmuir pressure P L , Formation skeleton density ρ m and formation fluid density ρ fl . The well positions and horizons for coring should reflect the basic characteristics of the shale in the study area.

[0064] Step 2: Calculate and obtain the key parameters of gas content in shale reservoirs through logging data:

[0065] 1) Using multiple linear regression method to obtain the TOC content of logging organic carbon log :

[0066] ① Correlation detection: Use SPSS (Statistical Product and Service Solutions) software to compare the TOC core Bivariate correlation ana...

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Abstract

The invention relates to a method for obtaining the gas content of shale reservoirs through well logging data, which comprises the following steps: Step 1: Select a shale gas well in the research area for coring, and then measure the porosity of the same shale sample respectively Organic carbon content TOCcore, water saturation Sw-core, cementation index m, saturation index n, Langmuir volume VL, Langmuir pressure PL, formation skeleton density ρm, and formation fluid density ρfl; The key parameters of the gas content of the shale reservoir are obtained through well data calculation; step 3: use the above key parameters to calculate the adsorbed gas content and free gas content respectively, and use the sum of adsorbed gas and free gas to characterize the total gas content of the shale reservoir. The invention calculates the gas content of shale reservoirs by means of well logging data, reduces the cost of drilling and coring, and shortens the cycle of evaluating the gas content of reservoirs. At the same time, the present invention calculates the total amount of natural gas in the shale reservoir from the two phase states of adsorbed gas and free gas, which conforms to the gas-bearing characteristics of the shale reservoir and has higher calculation accuracy.

Description

technical field [0001] The invention relates to a method for obtaining the gas content of shale reservoirs, in particular to a method for obtaining the gas content of shale reservoirs through logging data. Background technique [0002] Gas content is a key parameter in the evaluation of shale reservoirs, which is of great significance to the evaluation of shale gas content and reserve prediction. The determination of gas content includes on-site desorption method, isothermal adsorption method and logging interpretation method. The on-site desorption method reflects the actual gas content of the sample, but due to the influence of the coring method and drilling time, the estimation error of gas loss is relatively large. The isothermal adsorption method obtains the maximum adsorbed gas volume of shale, without considering the free gas content, which is quite different from the actual gas content. The well logging interpretation method is to establish a well logging interpret...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00G01N7/14
Inventor 唐颖李乐忠蒋时馨
Owner CHINA NAT OFFSHORE OIL CORP
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