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Method for quantitatively expressing carbonate rock pore evolution contribution

A technique for quantitative characterization of carbonate rocks, applied in measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc.

Inactive Publication Date: 2014-12-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
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Problems solved by technology

[0011] Although a lot of research has been done by previous researchers, the quantitative characterization of mechanical compaction, intergranular pressure solution and cementation in the reduction of carbonate rock porosity is still in the blank.

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  • Method for quantitatively expressing carbonate rock pore evolution contribution
  • Method for quantitatively expressing carbonate rock pore evolution contribution
  • Method for quantitatively expressing carbonate rock pore evolution contribution

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Embodiment Construction

[0054] Below in conjunction with embodiment the present invention is further described in detail:

[0055] Limestone of Changxing Formation in Well P6 of Puguang Oilfield in Northeast Sichuan is an ideal area for quantitative research on mechanical compaction, intergranular pressure solution and cementation. (2) The Changxing Formation in this area lacks siliciclastic grains and clay minerals that affect compaction; (3) The formation experienced relatively simple porosity evolution, Fractures are not developed, and the porosity of Well P6 (5350.4m) is 2.3% ( figure 2 ).

[0056] Although some particles are microcrystalline, the outer layers of most particles exhibit radial concentric structures. For all particle types, the original structure is preserved. The spherical structure and the original calcite mineral composition minimize the influence of mineral composition and grain shape on the porosity evolution.

[0057] The specific implementation steps are:

[0058] Step...

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Abstract

The invention discloses a method for quantitatively expressing the carbonate rock pore evolution contribution, comprising the following steps: firstly, predicting the original porosity; secondly, solving the porosity lost by cementation; thirdly, solving the porosity lost by intergranular pressure solution; fourthly, solving the porosity lost by mechanical compaction; and fifthly, repeating steps 1-4, and calculating the contribution value of the carbonate rock mechanical compaction, the intergranular pressure solution and the cementation at different positions to reduction of the porosity. Compared with the prior art, the method has the advantage of providing a new thought for the aspects of pore evolution of the carbonate rock, the volume of the carbonate rock corroded by intergranular pressure solution and the number of cements provided for flow of the carbonate rock dissolved to underground fluid, so as to seek for high-porosity areas from pore evolution contribution and explore a high quality reserve stratum in the carbonate rock.

Description

technical field [0001] The invention relates to a method for the relative ratio of mechanical compaction, particle pressure solution and cementation to porosity reduction, in particular to a method for quantitatively characterizing the contribution of carbonate rock pore evolution. Background technique [0002] The pore evolution of sandstone is generally dominated by mechanical compaction, plus a certain amount of cementation. In contrast, the pore evolution of carbonate rocks is much more complicated than that of sandstone pore evolution. In addition to the above two effects on porosity, granular pressure solution plays an indispensable role in the pore evolution of carbonate rocks. Factors affect the pore evolution of carbonate rocks, so the quantitative characterization of the pore evolution contribution becomes relatively difficult. [0003] The porosity of carbonate rocks decreases exponentially with depth. The reduction of porosity is the combined effect of mechanic...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 肖佃师陈红丽卢双舫张鲁川郭思祺
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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