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Reservoir layer evaluation method by utilizing nuclear magnetic resonance logging interpretation parameters

A technology for nuclear magnetic resonance and parameter interpretation, which is used in electronic magnetic resonance/nuclear magnetic resonance detection, electrical/magnetic detection for logging records, and re-radiation. and combination problems to achieve universal applicability and improve the accuracy of identification

Active Publication Date: 2012-07-11
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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Problems solved by technology

[0005] However, in the practical application of the above-mentioned technical solution, because it uses the direct parameters of analysis, the multiple parameters are not optimized and combined, and the ideal evaluation effect cannot be achieved.

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  • Reservoir layer evaluation method by utilizing nuclear magnetic resonance logging interpretation parameters

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Embodiment 1

[0016] The invention discloses a method for reservoir evaluation using nuclear magnetic resonance mud logging interpretation parameters. The oil saturation So, movable fluid saturation BVM, movable water saturation SMw and The four parameters of porosity φ are screened out;

[0017] Select the two parameters of oil saturation So and movable fluid saturation BVM, and use the formula M1=BVM*So to obtain the M1 parameter reflecting the oil-bearing characteristics and overall energy of the reservoir;

[0018] Use the formula SMo=BVM-SMw to calculate the movable oil saturation SMo parameter, and then use the formula M2=SMo*φ to obtain the M2 parameter reflecting the recoverable oil volume of the reservoir;

[0019] The obtained M1 and M2 values ​​are evaluated and divided into reservoir fluid categories according to the following methods:

[0020] For the parameter M1 value, take the average M1 value of the interpretation section, when the M1 value is greater than 1100, it is inte...

Embodiment 2

[0022] The present invention utilizes rock cores to carry out nuclear magnetic resonance analysis, combines oil testing data, and utilizes logical reasoning, geological theory and mathematical statistics to establish two interpretation parameter schemes:

[0023] 1) Select two parameters, So (oil saturation) and BVM (moveable fluid saturation), which are meaningful to oilfield production, and combine them to form the M1 parameter, which reflects the oil-bearing characteristics and overall energy of the reservoir;

[0024] 2) Logically analyze the relationship between So (oil saturation) and SMo (moveable oil saturation), and combine the porosity to combine the M2 parameters to quantify the amount of recoverable oil in the reservoir. The present invention screens out four parameters of So (oil saturation), BVM (moveable fluid saturation), SMw (moveable water saturation) and φ (porosity) in the core parameters measured by NMR logging. Use the formula SMo=BVM-SMw to calculate the...

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Abstract

The invention discloses a reservoir layer evaluation method by utilizing nuclear magnetic resonance logging interpretation parameters, relating to the geology logging interpretation evaluation technology field of petroleum geological exploration; oil saturation So and mobile fluid saturation BVM parameters are chosen, a formula M1=BVM*So is utilized to obtain the M1 parameter which reflects the oil characteristics of the reservoir layer and the total energy; by utilizing the formula SMo=BVM-SMw, the mobile oil saturation SMo parameter is calculated, and then the formula M2=SMO*phi is utilizedto obtain the M2 parameter which reflects the recoverable oil volume of the recoverable oil volume, and then the fluid type is determined according to the numeric range of the M1 and M2 values; by adopting the method, different oil grades of the reservoir layer can be effectively and quantitatively divided in a refining way, the undetermined factors of the interpretation parameters caused by block, horizon and oil-containing characteristics are eliminated, and the reservoir layer evaluation method has general applicability to a clastic rock oil-containing bed series.

Description

technical field [0001] The invention relates to the technical field of geological logging interpretation and evaluation for petroleum geological exploration, and is mainly applicable to the nuclear magnetic resonance logging interpretation and evaluation technology for low-permeability reservoir cores. Background technique [0002] Nuclear magnetic resonance logging technology is a new type of mud logging technology, which is a mud logging method that uses the nuclear magnetic resonance phenomenon of hydrogen nuclei in the sample in a known magnetic field to detect the characteristics of formation pores and fluids. The nuclear magnetic resonance logging technology mainly uses CPMG pulse sequence to measure the size and distribution of the transverse relaxation time T2 of the hydrogen nucleus in the rock sample, and obtains two important parameters: one is the size of the nuclear magnetic resonance signal, which corresponds to the size of the hydrogen nucleus in the rock sampl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/32G01V3/38
Inventor 马俊胜
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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