Method for determining coal bed gas content of target coal bed
A technology for coal bed methane and coal seam, which is applied in the field of evaluating the coal bed methane content of a target coal seam, can solve the problems of low efficiency, long time required and high implementation cost, and achieves the effect of easy application and improved accuracy
Active Publication Date: 2017-01-11
CHINA PETROLEUM & CHEM CORP +1
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However, these methods are costly to implement and take longer, resulting in inefficiencies
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Embodiment 1
[0044] According to well logging, the No. 15 coal seam (ie, the target coal seam) includes coal matrix and ash. The No. 15 coal seam was drilled at multiple locations, and neutron logging, density logging and natural gamma logging were performed, thereby obtaining multiple sets of CNL values, DEN values and Aad values. Take samples in the well, and then measure the gas content Sdg of these samples in the laboratory. The data are shown in Table 1. Table 1 also shows the characteristic parameter of porosity K1 and characteristic parameter of density K2.
[0045] Table 1
[0046] Numbering CNL DEN Aad Sdg K1 K2 X1 52 1.16 0.05 14.3 49.3 1.1 X2 47 1.27 0.06 11.2 44.4 1.2 X3 49 1.17 0.06 12.9 46.2 1.1 X4 50 1.12 0.02 14.6 48.9 1.1 X5 48 1.24 0.03 12.7 46.4 1.2 X6 49 1.14 0.03 13.7 47.3 1.1 X7 44 1.28 0.06 11.8 40.6 1.2 X8 43 1.29 0.06 12.0 40.2 1.2 X9 53 1.15 0.05 14.8 5...
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The invention relates to a method for determining the coal bed gas content of a target coal bed. The method comprises the following steps that step one, the porosity characteristic parameters K1, the density characteristic parameters K2 and the point gas contents Sdg at a plurality of positions of the target coal bed are obtained; step two, a formula for the coal bed gas content Sg of the target coal bed is built according to the relation between the porosity characteristic parameters K1, the density characteristic parameters K2 and the point gas contents Sdg; and step three, the coal bed gas contents at different positions of the target coal bed are determined through the formula for the coal bed gas content Sg in the step two. The formula for the coal bed gas content Sg of the target coal bed can be obtained through the method for determining the coal bed gas content of the target coal bed; and through the formula, the coal bed gas contents at the different positions of the target coal bed can be obtained just by means of the apparent well logging porosity, the apparent density and the volume content of ash obtained through well logging, construction cost is largely lowered, and construction efficiency is also high.
Description
technical field [0001] The invention relates to the technical field of exploration and development of unconventional oil and gas wells, in particular to a method for evaluating the coalbed gas content of a target coal seam. Background technique [0002] Coalbed methane refers to the hydrocarbon gas stored in coal seams with methane as the main component. It is an associated mineral resource of coal and belongs to unconventional natural gas. The calorific value of coalbed methane is 2-5 times that of common coal, equivalent to natural gas, and almost no waste gas is produced after combustion. It is a good fuel for industry, chemical industry, power generation and residential life. When the volume content of coalbed methane in the air reaches 5%-16%, it will explode (that is, gas explosion) when encountering an open flame. Therefore, if coalbed methane is exploited before coal mining, the probability of coal mine gas explosion can be greatly reduced. In summary, the developm...
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IPC IPC(8): E21B49/00
Inventor 张松扬王晓畅苏俊磊龚劲松张爱芹
Owner CHINA PETROLEUM & CHEM CORP