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Underground deep-buried meander point dam sand body historical reconstruction method

A point dam and historical technology, applied in earthwork drilling, wellbore/well components, geometric CAD, etc., can solve problems such as inaccurate anatomical results of sand body structures, and achieve reasonable anatomical results

Active Publication Date: 2015-03-25
北京福瑞宝能源科技有限公司
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a method for reconstructing the sand body history of underground meandering point bar, which solves the problem of inaccurate anatomical results of sand body building structures reconstructed in the prior art for the historical process of river courses

Method used

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  • Underground deep-buried meander point dam sand body historical reconstruction method
  • Underground deep-buried meander point dam sand body historical reconstruction method
  • Underground deep-buried meander point dam sand body historical reconstruction method

Examples

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Embodiment 1

[0109] Example 1: Taking the q4-17 single layer of the Yangdachengzi oil layer formation in Jilin Oilfield as an example, and taking the meander point bar as an example, the evolution process and historical reconstruction are carried out.

[0110] (1) Identification of point dams by enveloping line method of streamlines at the beginning and end stages

[0111] In the isopach map of sand bodies dominated by meandering channels in a single period, the thickness centers of sand bodies are mostly distributed in a non-linear and asymmetric beaded shape, rather than the expected long strip-shaped distribution, which may be related to meandering flow. The continuous meandering of the river is related to the continuous lateral migration and enrichment of sand bodies, which leads to asymmetric distribution of sand bodies along the axis on both sides. As for meandering channel sand bodies distributed in long bands, they mostly appear in composite channel isopach maps, which may be the r...

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Abstract

The invention discloses an underground deep-buried meander point dam sand body historical reconstruction method. A preliminary-stage riverway flow line and terminal-stage riverway flow line enveloping method is adopted, and combined with a sand body thickness diagram, a point dam is recognized; through extraction of the point dam lateral deposition body scale, the tendency, the inclination and lateral deposition body spacing parameter in a research region, a point dam building structure recognition key parameter database is built, through a skeleton section, fine dissection is conducted on the meander riverway sand body of a stratigraphic unit, riverway flow lines are obtained, then the riverway flow lines are sequentially recovered and arranged according to the development sequence, and the riverway sedimentary evolution history is represented. The underground deep-buried meander point dam sand body historical reconstruction method has the advantages that the sand body building structure dissection result for riverway historical process rebuilding is made to be more reasonable and closer to the actual underground situation.

Description

technical field [0001] The invention belongs to the technical field of basic oil field geology, and relates to a method for reconstructing the history of underground meander point bar sand bodies. Background technique [0002] There is a difference between the concept of a single-stage river course and a single river course. On the basis of fully following the principles of vertical staging and plane branching, a single-stage river course emphasizes the vertical phase, while a single-stage river course emphasizes the branching of a planar river course sex. There are several single-stage channels inside the compound channel, and most of the channels in the sedimentary microfacies map are also at the compound channel level. The formation of the compound channel is mainly caused by the channel’s frequent migration, swing, abandonment and cutting on the plane. As a result, compound channels with a large distribution scale are formed, and the width can generally reach thousands ...

Claims

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Application Information

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IPC IPC(8): E21B49/00
CPCG06F30/13Y02A20/402
Inventor 单敬福
Owner 北京福瑞宝能源科技有限公司
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