Method for determining diagenetic process and porosity evolution process of foreland basin sandstone reservoir

A sandstone and pore technology, which is applied to the determination of the diagenesis process and pore evolution process of sandstone reservoirs in foreland basins, can solve problems such as difficulty in identifying pores, and achieve the effect of improving identification accuracy.

Inactive Publication Date: 2016-02-17
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0006] However, conventional cast thin sections are mainly researched on micron-scale and above pores, while for tight sandstone with very small pores and extremely low porosity and permeability, the pore diameter is generally

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  • Method for determining diagenetic process and porosity evolution process of foreland basin sandstone reservoir
  • Method for determining diagenetic process and porosity evolution process of foreland basin sandstone reservoir
  • Method for determining diagenetic process and porosity evolution process of foreland basin sandstone reservoir

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[0049] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solutions of the present invention are now described in detail below, but should not be construed as limiting the scope of implementation of the present invention.

[0050] In the northern part of the Tarim Basin in western China, there are ultra-deep tight sandstone reservoirs in the foreland background. The burial depths of the reservoirs vary from 6500 to 8500 m, the porosity is 1 to 8%, the average is 3 to 4%, and the micro-nano pores It is particularly developed. Only a very small amount of pores can be observed using ordinary casting thin sections, which seriously affects the analysis of diagenesis and pore evolution. Late cements will develop around early cements, which are often mistaken for the formation of the same period using ordinary microsections, which has become a key problem in reservoir research. In this regard, th...

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Abstract

The invention provides a method for determining a diagenetic process and a porosity evolution process of a foreland basin sandstone reservoir. The method comprises steps as follows: determining reservoir genesis and petrologic features; determining a burial process and tectonic uplift and subsidence periods; determining a diagenesis type, features and strength of the reservoir by a cathodoluminescence microscope and/or through QEMScan (Quantitative Evaluation of Minerals by SCANning electron microscopy), and recovering the diagenetic process; determining reservoir space features and the porosity evolution process by a fluorescence microscope and/or a confocal laser scanning microscope. With the adoption of the method, the diagenetic process and the porosity evolution process of the ultra-deep compact foreland basin sandstone reservoir with complicated burial process, extremely great depth, extremely small pores and extremely low porosity and permeability can be effectively analyzed; the method can be used for predicating the quality of the sandstone reservoirs in different areas in the plane and the vertical profile, so that more and larger oil and gas fields can be discovered.

Description

technical field [0001] The invention relates to a method for determining the diagenesis process and pore evolution process of a sandstone reservoir in a foreland basin, and belongs to the technical field of petroleum exploitation. Background technique [0002] Foreland basins are an important place for the enrichment of oil and natural gas. At present, there are many evaluation techniques for the diagenesis and pore evolution process of sandstone reservoirs in foreland basins at home and abroad. A large number of studies have been carried out on the Sandstone reservoirs with low porosity, medium and low permeability in the Triassic and Triassic, and the Paleogene-Neogene low-porosity and low-permeability sandstone reservoirs in the northwestern margin of the Qaidam Basin. However, the deposition and burial processes of the sandstone reservoirs in these foreland basins are relatively simple, the pores are relatively developed, and the physical properties are relatively good....

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Application Information

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IPC IPC(8): G01N15/08
Inventor 钟大康李勇毛亚昆杨宪彰孙海涛雷刚林张春伟吴超张鹏能源王点刘云龙祝海华李卓沛王爱姜振昌周煜哲赵岳
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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