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Oil and gas saturation prediction method independent of logging information

A technology of well logging data and prediction methods, applied in seismology for well logging records, seismic signal processing, etc., to achieve the effect of reducing costs

Active Publication Date: 2021-10-22
GUANGZHOU MARINE GEOLOGICAL SURVEY
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Problems solved by technology

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a method for predicting oil and gas saturation that does not rely on well logging data, which can solve the problem of predicting oil and gas saturation without well logging data

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  • Oil and gas saturation prediction method independent of logging information
  • Oil and gas saturation prediction method independent of logging information

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Embodiment Construction

[0039] Below, the present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0040] Such as Figure 1-Figure 5 As shown, a method for predicting oil and gas saturation independent of well logging data includes the following steps:

[0041] Step 1: Conduct geological background investigation on the target area to obtain the petrophysical parameters of the target area, and assign probabilities to each parameter in the petrophysical parameters to form a probability distribution, thereby obtaining the prior probability distribution of the petrophysical parameters.

[0042] In this step, the geological background investigation includes consulting literature and the geological conditions obtained from the existing geological research on the target area. Of course, the petrophysical parameters of the target area can also be obtained through communication with local scientific researchers.

[0043] refer to figure 2 , the r...

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Abstract

The invention discloses an oil and gas saturation prediction method independent of logging information, and the method comprises the steps: carrying out the geological background investigation, and obtaining the prior probability distribution of rock physical parameters; carrying out multiple times of random sampling on each rock physical parameter in all the rock physical parameters with prior probability distribution to obtain a plurality of numerical values, and obtaining rock physical parameter sampling values; presetting an R-H-G rock physical empirical model and a rock density equation; substituting the rock physical parameter sampling value, calculating the corresponding longitudinal wave speed, density and longitudinal wave impedance, and obtaining posterior probability distribution data between the longitudinal wave impedance and the oil gas saturation; and performing fitting optimization by taking the longitudinal wave impedance as an independent variable and the oil gas saturation as a dependent variable to obtain a calculation formula for calculating the oil gas saturation through the longitudinal wave impedance, and predicting the oil-gas saturation according to a prediction formula by taking the calculation formula as the prediction formula. According to the method, the oil gas saturation can be predicted without depending on logging information.

Description

technical field [0001] The invention relates to the technical field of prediction of oil-gas saturation, in particular to a method for predicting oil-gas saturation independent of logging data. Background technique [0002] Oil and gas saturation prediction is one of the important goals of seismic oil and gas exploration. Existing technical solutions for oil and gas saturation prediction usually start from the drilling data, and obtain the lithology, physical properties (physical properties), fluid and reservoir conditions of the target formation through the logging data and core data in the drilling data. Then select the appropriate petrophysical model, establish the conversion relationship between oil and gas saturation and elastic parameters such as seismic wave impedance, and finally use the inversion results of elastic parameters such as wave impedance calculated by the seismic inversion technology based on the well model, and The oil and gas saturation is predicted by...

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Application Information

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IPC IPC(8): G01V1/50
CPCG01V1/50
Inventor 张莉雷振宇骆帅兵钱星王辉赵裕辉林桂康
Owner GUANGZHOU MARINE GEOLOGICAL SURVEY
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