Method for evaluating reservoir stratum with nuclear magnetic resonance logging interpretation chart

A nuclear magnetic resonance and reservoir technology, which is applied in the direction of electronic magnetic resonance/nuclear magnetic resonance detection, electrical/magnetic detection for logging records, and re-radiation, etc. The effect of universal applicability

Active Publication Date: 2010-06-02
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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Problems solved by technology

[0006] In order to solve the above-mentioned technical problems, the present invention proposes a method for evaluating reservoirs by using nuclear magnetic resonance logging interpretation charts in rock cores of low-permeability reservoirs. This method can solve the problem of whether the evaluated reservoirs can leak fluid or not. , The problem of what kind of fluid is produced can also solve the problem of oil content in the reservoir and how much oil is produced

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  • Method for evaluating reservoir stratum with nuclear magnetic resonance logging interpretation chart
  • Method for evaluating reservoir stratum with nuclear magnetic resonance logging interpretation chart
  • Method for evaluating reservoir stratum with nuclear magnetic resonance logging interpretation chart

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Embodiment 1

[0019] The invention discloses a method for evaluating reservoirs by using nuclear magnetic resonance logging interpretation charts. The oil saturation So, movable fluid saturation BVM, and movable water saturation Smw in the core parameters measured by nuclear magnetic resonance logging are calculated. and the four parameters of porosity φ are screened out;

[0020] Select the two parameters of oil saturation So and movable fluid saturation BVM, use the formula M1=BVM*So to obtain the M1 parameter reflecting the oil-bearing characteristics and overall energy of the reservoir, and combine the porosity φ parameter measured by NMR to establish φ-M1 Explain the chart, the chart is divided into 5 areas, and each area corresponds to the corresponding fluid level: when φ is less than 6%, M1 is not considered, it is the dry zone; when φ is greater than 6%, the critical line M1=620× LN(φ)-100, M1=240×LN(φ)+100, M1=220×LN(φ)-240 are divided into four areas, among which M1>620×LN(φ)-100...

Embodiment 2

[0025] Refer to the attached figure 1 and 2 , the present invention utilizes rock core to carry out nuclear magnetic resonance analysis, combines oil test data, utilizes the method of logic reasoning, geological theory and mathematical statistics, determines the critical curve of different oil-bearing grades, establishes following two kinds of explanation boards:

[0026] 1) Select the two parameters of So (oil saturation) and BVM (moveable fluid saturation) that are meaningful to oilfield production, and combine the M1 parameters to reflect the oil-bearing characteristics and overall energy of the reservoir; Control, build φ-M1 interpretation plate.

[0027] 2) Logically analyze the relationship between So (oil saturation) and Smo (moveable oil saturation), combine the porosity, combine the M2 parameters, and quantify the amount of recoverable oil in the reservoir; combine So (oil saturation) to establish a reflection The So-M2 interpretation chart of the relationship betwe...

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Abstract

The invention discloses a method for evaluating a reservoir stratum with a nuclear magnetic resonance logging interpretation chart, relating to the technical field of evaluation of petroleum geology exploration geological logging interpretation. The method comprises the steps of: selecting two parameters such as an oil saturation So and a movable fluid saturation BVM; obtaining a parameter M1 with the formulation M1=BVM*So; building Phi-M1 interpretation chart; computing the movable oil saturation Smo parameter with the formulation Smo=BVM-Smw; obtaining a parameter M2 with the formulation M2=Smo*phi; building So-M2 interpretation chart; and visually evaluating the classification of the reservoir stratum liquid with the two interpretation charts. The method can solve the problem for evaluating whether the reservoir stratum can generate liquid and the character of the fluid, can solve the problem for evaluating the oil content of the reservoir stratum and the oil capacity, removes uncertain factors of interpretation parameters caused by factors such as block, stratum position and oil content character, and the like, and has universal applicability in oil-containing bed series of clastic rocks.

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 Applications(China)
IPC IPC(8): G01V3/32G01V3/38
CPCY02A90/30
Inventor 马俊胜
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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