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Method and device for determining oil-bearing thickness of tight reservoir

A technology for determining methods for tight reservoirs, applied in data processing applications, instruments, design optimization/simulation, etc., can solve problems such as misjudgment of oil thickness, difficulty in identification, and errors in exploration and development, and achieve the effect of reducing the error rate

Active Publication Date: 2019-08-02
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The existing oil reservoirs are basically conventional oil reservoirs, and the main driving force of oil migration in conventional oil reservoirs is buoyancy, while the main driving forces of oil migration in tight oil reservoirs are hydrocarbon generation pressurization and capillary pressure difference. Different from conventional oil reservoirs in terms of migration and migration methods, the existing methods for determining oil-bearing thickness of reservoirs are not suitable for tight oil reservoirs; seismic technology is still being explored for oil-bearing identification of reservoirs, especially for tight thin reservoirs. It is difficult to identify the oil-bearing thickness of the reservoir, and the logging technology is greatly affected by the lithology with extremely high resistivity or extremely low resistivity, which may easily cause misjudgment of the oil-bearing thickness, affect the evaluation of the reservoir and the calculation of reserves, and cause mistakes in exploration and development

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  • Method and device for determining oil-bearing thickness of tight reservoir
  • Method and device for determining oil-bearing thickness of tight reservoir

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Embodiment 1

[0062] This embodiment provides a method for determining the oil-bearing thickness of tight reservoirs. Taking the XX Group of XX Oilfield in XX Basin in China as an example, the present invention will be further described in detail, see figure 1 , the method flow is as follows:

[0063] Step 101: Obtain the required parameters in the calculation process of reservoir oil thickness obtained through core test or logging interpretation;

[0064] Specifically, the XX Group of XX Oilfield in the XX Basin in China obtained data through core tests or well logging interpretation: the thickness Hc of the source layer is 14 m, and the density ρ c 2.5g / cm 3 ,Porosity 6.2%, the throat radius r c is 0.005μm, TOC is 1.94%, organic carbon maturity Ro is 1.05%; the reservoir thickness H is 5m, the porosity is 2.98%, and the vertical fracture spacing L is 2.85m; Side contact; buried depth at source-reservoir interface is 2500m, hydrostatic column pressure Pl=25MPa; underground crude oil d...

Embodiment 2

[0088] This embodiment provides a device for determining the oil thickness of tight reservoirs, which is used to implement the method in the first embodiment above, see figure 2 , the device consists of:

[0089] The parameter acquisition module 201 is used to acquire the required parameters in the process of calculating the oil-bearing thickness of the reservoir obtained through the core test or logging interpretation;

[0090] The first calculation module 202 is used to select the corresponding parameters from the required parameters in the process of calculating the oil-bearing thickness of the reservoir and respectively substitute them into the calculation model of the hydrocarbon generation pressurization and the calculation model of the capillary pressure difference to calculate the hydrocarbon generation pressurization ΔPc and capillary pressure difference ΔPm;

[0091] The second calculation module 203 substitutes the hydrocarbon generation pressurization ΔPc, the ca...

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Abstract

The invention discloses a method and a device for determining the oil-containing thickness of a tight reservoir, and belongs to the technical field of oil-gas field development. The method comprises the following steps: acquiring parameters needed in a reservoir oil-containing thickness resolving process obtained by a core test or well logging interpretation; selecting corresponding parameters, and substituting the parameters into a hydrocarbon-generating pressurization resolving model and a capillary pressure difference resolving model; resolving hydrocarbon-generating pressurization and a capillary pressure difference; substituting the corresponding parameters selected in the reservoir oil-containing thickness resolving process into an oil-containing thickness resolving model to obtain a reservoir oil-containing thickness. The reservoir oil-containing thickness is resolved by a calculation method for the oil-containing thickness of the tight reservoir, so that a basis is laid for the calculation and evaluation of the reserve of the tight reservoir, and the error rate of later-stage exploration and development is lowered.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a method and device for determining the oil-bearing thickness of tight reservoirs. Background technique [0002] Tight oil reservoir is a kind of reservoir with low porosity and low permeability. It is extremely difficult for buoyancy to drive oil migration in this kind of reservoir. The main driving force of oil migration is hydrocarbon generation pressurization and capillary pressure difference. Also because of this, the oil distributed in tight reservoirs is mainly close to source layers and fractures. The exploration and development of tight reservoirs is an important part of the field of oil and gas field development. Calculating the reserves before development can evaluate the reservoirs more reasonably and formulate oilfield development plans. Reservoir oil-bearing thickness, as an important parameter for reserve calculation, directly affects the eva...

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Application Information

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IPC IPC(8): G06F17/50G06Q50/02
CPCG06F30/20G06Q50/02
Inventor 金涛杨家静李育聪邹娟李耀华郭蕊莹邓燕徐丽媛
Owner PETROCHINA CO LTD