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Method for predicting porosity of tight sandstone reservoir

A technology of tight sandstone reservoirs and prediction methods, which is applied in the field of porosity prediction of tight sandstone reservoirs, can solve the problems that the porosity of tight sandstone reservoirs cannot be effectively predicted, and achieve high coincidence rate, high precision prediction, and accurate description Effect

Pending Publication Date: 2022-05-13
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for predicting the porosity of tight sandstone reservoirs to solve the problem that the porosity of tight sandstone reservoirs cannot be effectively predicted at present

Method used

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  • Method for predicting porosity of tight sandstone reservoir
  • Method for predicting porosity of tight sandstone reservoir
  • Method for predicting porosity of tight sandstone reservoir

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Embodiment 1

[0038] Embodiment 1 provides a kind of prediction method of tight sandstone reservoir porosity, and this method comprises the following steps:

[0039] Step S1: Determine the three-dimensional data volume of P-wave impedance of the sandstone, which specifically includes the following steps:

[0040] Step S11: According to the well logging curve of the target area, draw the intersection diagram of the ratio of P-to-S wave velocity and P-wave impedance, as shown in figure 1 As shown, the lithofacies curve is used as the color code to determine the threshold value a of the P-to-S wave velocity ratio corresponding to the sandstone. In this embodiment, a is 1.8. Sandstone is lower than the threshold value a of the P-to-S wave velocity ratio corresponding to the sandstone, and mudstone is higher than the threshold value a of the P-to-S wave velocity ratio corresponding to the sandstone;

[0041] Step S12: Calculate the three-dimensional data volume of P-wave impedance and the three...

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Abstract

The invention discloses a method for predicting the porosity of a tight sandstone reservoir. The method comprises the following steps: determining a longitudinal wave impedance three-dimensional data volume of sandstone; determining a longitudinal wave impedance threshold value for dividing the thin reservoir and the thick reservoir; obtaining a prediction result of the porosity of the thick reservoir; obtaining a prediction result of the porosity of the thin reservoir; and combining the prediction results of the porosity of the thick reservoir and the porosity of the thin reservoir into a data volume to obtain a prediction result of the porosity of the whole reservoir. According to the method for predicting the porosity of the tight sandstone reservoir, the porosity distribution of the thick reservoir can be effectively predicted, the porosity distribution of the thin reservoir is considered, the method has a high coincidence rate through actual drilling verification, and high-precision prediction of the porosity of the tight sandstone reservoir is achieved. And through a classification prediction mode, the depiction of the porosity of the reservoir is more accurate, and an effective result is provided for efficient development of the compact sandstone reservoir.

Description

technical field [0001] The invention belongs to the field of oil and gas exploration and development, in particular to a method for predicting the porosity of tight sandstone reservoirs. Background technique [0002] Tight sandstone gas exploration prospects in the eastern margin of the Ordos Basin are broad and belong to unconventional gas reservoirs. Natural gas is mainly stored in relatively high-porosity reservoirs of tight sandstone (porosity is generally 7-15%). High-precision prediction of reservoir porosity is particularly important for finding relatively high-porosity sweet spots in tight sandstones. There is a certain correlation between porosity and P-wave impedance. For conventional reservoirs (porosity is generally 12-25%), seismic data inversion can be used to calculate P-wave impedance, and a linear fitting relationship between P-wave impedance and porosity can be established. Porosity is predicted. [0003] However, there are many factors affecting P-wave ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/6244
Inventor 肖曦韩刚何峰叶云飞王志红牛聪黄饶王健花张益明王迪
Owner CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD
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