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A Method of Reservoir Analysis and Its Application

A technology of reservoir and target layer, which is applied in the field of reservoir analysis, can solve the problems of impossibility to take samples from the entire reservoir and low accuracy, and achieve the effects of reducing the number of sampling, accurate analysis results and strong operability

Active Publication Date: 2018-09-11
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) Due to the limitation of the cost of drilling and coring, it is impossible to carry out large-scale coring during the drilling process. Due to the changes in the depositional environment, late diagenesis and tectonic movement, the distribution of reservoirs in the vertical direction is very different. Large heterogeneity, it is impossible to sample all types of reservoirs even with many cores
Less accurate when analyzing the entire reservoir due to large heterogeneity
[0004] (2) Due to the limitations of analysis and testing workload and cost, it is impossible to conduct high-density, large-scale casting thin sections, electron microscope scanning and mercury intrusion analysis and testing
Therefore, the use of a limited number of sample pore structure parameters for reservoir analysis of the target layer has great limitations

Method used

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  • A Method of Reservoir Analysis and Its Application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The first step is to sample the core of the target layer, and carry out two analysis tests of constant-speed mercury injection and nuclear magnetic resonance on each sample of the core, and obtain their parameters including throat radius, pore radius, final mercury injection saturation, mainstream Throat radius, average capillary radius, root mean square value of throat radius, average value of pore-throat radius ratio, microcosmic average coefficient, sorting coefficient, maximum connected throat radius, displacement pressure, total pore mercury saturation, total throat inlet Parameter data for mercury saturation, total pore / throat volume ratio, and percent mobile fluid.

[0041] The second step is to use the porosity (φ) and permeability (k) curves of the entire well section of the target layer calculated by professional well logging to obtain the permeability-to-porosity ratio curve (k / φ) of the entire well section.

[0042] In the third step, for each pore structure...

Embodiment 2

[0056] The first step is to sample the core of the target layer, and carry out two analysis tests of constant-speed mercury intrusion and nuclear magnetic resonance on each core sample to obtain their throat radius (Rth), pore radius (Rp) and final progress. Mercury saturation (Shg) parameter data.

[0057] The second step is to use the porosity (φ) and permeability (k) curves of the entire well section of the target layer calculated by professional well logging to obtain the permeability-to-porosity ratio curve (k / φ) of the entire well section.

[0058] The third step is to intersect the throat radius of each sample measured in the first step with the corresponding permeability / porosity ratio calculated in the second step, and analyze the functional relationship between the two (such as a linear function relationship, Quadratic function relationship, logarithmic relationship, exponential relationship, etc.), based on the principle of the highest correlation coefficient, fit t...

Embodiment 3

[0069] Such as image 3 As shown, using the method of embodiment 1 or 2 of the present invention to obtain the pore structure indicating curve of the whole well interval reservoir in a certain oil field, the method for classifying and analyzing the whole well interval reservoir of the research target layer is as follows: the first step, calculate a certain The pore structure indicator curves of the research target intervals of 53 wells in the gas field.

[0070] The second step is to make statistics and analysis on the pore structure index (Rc) of the reservoir interval in the target interval of each well.

[0071] The third step is to carry out reservoir analysis and fluid interpretation for the wells that have undergone oil and gas testing in the target intervals in the study area, determine the fluid production intervals, and divide the reservoirs into I, II, and For class III, the distribution range of pore structure index (Rc) of each reservoir is calculated statisticall...

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Abstract

The invention relates to a reservoir stratum analysis method using pore structure parameters. The method comprises a first step of performing rock core sampling on a target layer and measuring to obtain a plurality of pore structure parameters; a second step of acquiring a pore degree and permeation rate data of a full hole section of the target layer, and acquiring a specific value curve of the permeation rate and the pore degree of the full hole section; a third step of fitting each measured pore structure parameter in the first step; a fourth step of selecting the pore structure parameter having high fitting degree in the third step and a fitted function relation of the pore structure parameters; a fifth step of calculating to obtain an instruction curve of the optimized pore structure parameters of the full hole section of the target layer; a sixth step of establishing a calculation formula of a pore structure instruction curve (Rc); and a seventh step of calculating a pore structure instruction curve of the full hole section of the target layer, so as to analyze the target layer of the full hole section. The invention also relates to an application of the method in exploration of oil and gas.

Description

technical field [0001] The invention relates to a reservoir analysis method, in particular to a reservoir analysis method using pore structure parameters. The invention also relates to the application of the method in the field of oil and gas exploration and / or development. Background technique [0002] Reservoir analysis has always been the basis and focus of oil and gas exploration and development. At present, the common basic idea of ​​using pore structure parameters for reservoir analysis is that after sampling the cores or ground rock samples in the coring section, in the laboratory through mercury injection, casting thin sections, scanning electron microscopy and nuclear magnetic resonance and other means , to determine the pore structure parameters of the reservoir, and then to determine the reservoir pore structure parameters of a target layer by point instead of plane, so as to guide the reservoir analysis. "Summary of Research Methods and Theories on Microscopic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00G01V1/50G01N33/24
Inventor 肖开华冯动军王丹丹
Owner CHINA PETROLEUM & CHEM CORP
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