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River delta facies sand body configuration prediction method

A prediction method, delta technology, applied in the field of oil and gas field mining geological research, to achieve the effect of improving prediction accuracy

Pending Publication Date: 2020-12-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a method for predicting the configuration of sand bodies of river delta facies, which is used to overcome the above-mentioned problems or at least partly solve or alleviate the above-mentioned problems

Method used

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  • River delta facies sand body configuration prediction method
  • River delta facies sand body configuration prediction method
  • River delta facies sand body configuration prediction method

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Experimental program
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Effect test

Embodiment 1

[0025] The present invention proposes a method for predicting the architecture of river delta facies sand body, comprising the following steps:

[0026] S001: Obtain the gamma ray detection response curve of each single well in the target depth interval;

[0027] S002: According to the gamma ray detection response curve, count the sand body thickness of each single well in the target depth interval, and draw the sand body thickness distribution plan;

[0028] S003: Distinguish the box curve and the bell curve from the gamma ray detection response curve according to the shape;

[0029] S004: Mark the box-shaped curve and bell-shaped curve distinguished from the gamma-ray detection response curve next to the corresponding well position in the sand body thickness contour map, and circle the box-shaped curve corresponding to the box-shaped curve in the figure area and the bell-shaped area corresponding to the bell curve.

Embodiment 2

[0031] S001: Obtain the gamma ray detection response curve of each single well in the target depth interval;

[0032] like figure 1 As shown, in step S001, a gamma ray detection device is deployed to detect each single well in the block, and the gamma ray detection response curve of each single well in the target depth interval is obtained. The gamma ray detection device belongs to the prior art.

[0033] Each single well in this gas reservoir area has been drilled and gamma-ray detection has been carried out earlier, so it is only necessary to collect the gamma-ray detection data and reservoir configuration data of the single well in this gas reservoir block. Each single well data is processed in the text software, such as figure 1 As shown, the layer and thickness of the sandstone are clarified.

Embodiment 3

[0035] S002: According to the gamma ray detection response curve, count the sand body thickness of each single well in the target depth interval, and draw the sand body thickness distribution plan;

[0036] like Figure 4 and Figure 5 , in step S002, according to the intensity of the detected gamma ray detection response curve of each single well, the corresponding sand body position is distinguished, the sand body thickness of the target layer is obtained, the equivalent interval is set for the sand body thickness, and then the sand body is drawn Plane map of body thickness equivalent distribution.

[0037] Among them, the depth range of the target layer is 3606m-3678m, and the equivalent interval of sand body thickness is 3m. In this gas reservoir area, when the gamma ray detection reaction intensity GR Figure 4 and Figure 5 In , each black dot represents the location of a single well.

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Abstract

The invention provides a river delta facies sand body configuration prediction method, which comprises the following steps of: S001, acquiring a gamma ray detection reaction curve of each single wellin a target depth interval; S002, counting the sand body thickness of each single well in the target depth interval according to the gamma ray detection reaction curve, and drawing a sand body thickness distribution plane graph; S003, distinguishing box-shaped curves and bell-shaped curves from the gamma ray detection reaction curves according to the shape; and S004, marking the box type curves and the bell-shaped curves which are distinguished from the gamma ray detection reaction curves beside corresponding well positions in the sand body thickness equivalent plane graph, and circling box-type areas corresponding to the box type curves and bell-shaped areas corresponding to the bell-shaped curves in the graph.

Description

technical field [0001] The invention belongs to the technical field of geological research of oil and gas field exploitation, and in particular relates to a method for predicting the structure of river delta facies sand bodies. Background technique [0002] Natural gamma logging is a logging method that measures the intensity of gamma rays emitted during the nuclear decay process of naturally occurring radionuclides in rock formations to study geological problems. The natural gamma curve can reflect the gamma ray intensity released when the radioactive elements in the rock stratum decay. Generally, the mudstone is stronger than the sandstone, and the higher the mud content in the sandstone (terrigenous clay), the greater the gamma ray intensity. Natural gamma ray logging is popular in the Sulige gas field, but in the past it was mainly to analyze the characteristics of the longitudinal logging curves of single wells and wells, without combining the distribution characteristi...

Claims

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Application Information

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IPC IPC(8): G01V5/12
CPCG01V5/12
Inventor 王一兰义飞张吉王龙黄强东韩楠杨特波范倩倩范萍王威
Owner PETROCHINA CO LTD
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