Evaluation method of mobile oil ratio and mobile oil source quantity of low porosity and low permeability sandstone reservoir

An evaluation method and low porosity and permeability technology, which are applied in measurement devices, instruments, and analysis by nuclear magnetic resonance, etc. problems, to achieve the effect of controllable experimental period, small human interference factors, and extensive promotion value

Active Publication Date: 2018-11-16
CHENGDU NORTH OIL EXPLORATION DEV TECH
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  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide an evaluation method for the proportion of movable oil in low porosity and permeability sandstone reservoirs and the amount of movable oil resources, so as to solve the problem of microscopic parameters in the prior art that are

Method used

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  • Evaluation method of mobile oil ratio and mobile oil source quantity of low porosity and low permeability sandstone reservoir
  • Evaluation method of mobile oil ratio and mobile oil source quantity of low porosity and low permeability sandstone reservoir
  • Evaluation method of mobile oil ratio and mobile oil source quantity of low porosity and low permeability sandstone reservoir

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Embodiment 1

[0043] A method for evaluating the proportion of movable oil in sandstone reservoirs with low porosity and permeability, the proportion of movable oil is calculated according to the following formula:

[0044] P m =(A bd -A ad ) / A bd

[0045] Among them, P m is the proportion of movable oil, A bd is the NMR T of the core sample before displacement 2 The integrated area of ​​the spectrum, A ad is the nuclear magnetic resonance T of the core sample after displacement 2 The integral area of ​​the spectrum;

[0046] The A bd By measuring the NMR T of the core sample before displacement 2 spectrum is obtained, the A ad By measuring the nuclear magnetic resonance T of the core sample after displacement 2 Spectrum acquisition;

[0047] The core sample is sampled from the target layer in the evaluation area;

[0048] NMR T of core samples before and after displacement 2 The measurement steps include:

[0049] Continue pressurizing for 48 hours under the displacement pr...

Embodiment 2

[0053] Such as figure 1 The method for evaluating movable oil resources in low porosity and permeability sandstone reservoirs includes the following steps:

[0054] (A) Obtain the oil and gas geological data of the target layer in the evaluation area, and the oil and gas geological data include oil-bearing area, effective reservoir thickness, reservoir porosity, reservoir permeability, oil saturation, crude oil density and crude oil volume coefficient;

[0055] (B) Sampling at different depths of the target layer in the evaluation area to obtain at least two core samples, and measure the porosity and permeability of the core samples;

[0056] (C) Using any one of the aforementioned methods for evaluating the proportion of movable oil in low porosity and permeability sandstone reservoirs of the claim to measure the proportion of movable oil in the core sample;

[0057] (D) according to the porosity of the core sample, the permeability, the movable oil ratio, the relationship f...

Embodiment 3

[0063] In order to facilitate understanding, the V oil formation of the third submember of the third member of the Shahejie Formation in the Gaoliu structural belt of the Nanpu Sag in the Bohai Bay Basin was selected as the research target layer, and the evaluation of the movable oil resources of the low porosity and permeability sandstone reservoirs was carried out, including the following steps:

[0064] Step 1: Collect the oil and gas geological data, mainly including: as shown in Table 1, the oil and gas geological data of the target layer in the area to be evaluated.

[0065] Table 1 Oil and gas geological data of the V oil group in the 3rd member of the third member of the Shahejie Formation in the Gaoliu structural belt in the Nanpu Sag, Bohai Bay Basin

[0066]

[0067] Step 2: Sampling at different depths of the V oil group cores in the 3rd member of Shahejie Formation in the study area, measuring the porosity and permeability of the core samples, and obtaining seve...

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Abstract

The invention discloses an evaluation method of the mobile oil ratio and the mobile oil source quantity of a low porosity and low permeability sandstone reservoir. The evaluation method comprises thefollowing steps of (A) acquiring oil-gas geology data of a target layer of an evaluation region; (B) performing sampling at different depths of the target layer of the evaluation region to obtain twoor more rock core samples, and determining the porosity and the permeability of each rock core sample; (C) adopting a low porosity and low permeability sandstone reservoir mobile oil ratio evaluationmethod to determine the mobile oil ratio of each rock core sample; (D) according to the porosity, the permeability and the mobile oil ratio of each rock core sample, establishing a relationship formula of the porosity, the permeability and the mobile oil ratio, and calculating the reservoir mobile oil ratio; and (E) calculating the mobile oil source quantity of the target layer of the evaluation region according to the reservoir mobile oil ratio. The mobile oil ratio calculation method provided by the invention does not need to consider a T2 relaxation time cutoff value and is higher in reliability by calculating the mobile oil ratio according to nuclear magnetic resonance T2 spectrum changes of the rock core samples before displacement and after displacement.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas exploration and development, in particular to an evaluation method for the proportion of movable oil in low porosity and permeability sandstone reservoirs and the amount of movable oil resources. Background technique [0002] 63.5% of my country's oil geological reserves are distributed in low-permeability and ultra-low-permeability reservoirs. In addition, tight oil and gas with low porosity and permeability characteristics are increasingly becoming an important part of global oil and gas supply. Low-permeability sandstone reservoirs have poor physical properties, fine pores and throats, and the seepage characteristics of fluids are different from conventional reservoirs. A large part of the fluid is bound by capillary force and viscous force and cannot participate in seepage. In low porosity and permeability sandstone reservoirs, only those oils that can participate in seepage, that is, ...

Claims

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Application Information

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IPC IPC(8): G01N24/08
CPCG01N24/081
Inventor 白桦庞雄奇张建国刘树根卢立泽王贺华康博何巍李建东张博闫志军钱利张艺久徐超赵星田雨岑玉达
Owner CHENGDU NORTH OIL EXPLORATION DEV TECH
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