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Method for determining ancient porosity of compact sandstone in pool-forming period

A tight sandstone and porosity technology, applied in the field of geological exploration, can solve the problem of inability to accurately judge the paleo-porosity of tight sandstone gas during the accumulation period

Inactive Publication Date: 2015-05-27
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0003] In order to solve the problem that the paleo-porosity of tight sandstone gas in the accumulation period cannot be accurately judged in the existing technology, a method for determining the paleo-porosity of tight sandstone gas in the accumulation period is proposed

Method used

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  • Method for determining ancient porosity of compact sandstone in pool-forming period
  • Method for determining ancient porosity of compact sandstone in pool-forming period
  • Method for determining ancient porosity of compact sandstone in pool-forming period

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specific Embodiment

[0075] Step 201, obtaining the lithology, sorting coefficient and diagenesis characteristics of the reservoir.

[0076] Using microscope observation, scanning electron microscope analysis and cathodoluminescence analysis, we can recognize the petrological and diagenetic characteristics of the Xu2 Member reservoir in the study area. The main rock types are lithic sandstone (35.9%), lithic quartz sandstone (24.9%) and feldspathic lithic quartz sandstone (14.1%). Reservoir diagenesis mainly includes compaction and pressure solution, cementation and dissolution.

[0077] Table 1 Homogenization temperature of diagenetic minerals in the Xu 2 Member in Western Sichuan Depression

[0078]

[0079]

[0080] Table 1 shows the homogenization temperature of diagenetic minerals in the Xu2 Member in the Western Sichuan Depression obtained through fluid inclusion analysis and testing. It shows that the average homogenization temperature of the authigenic quartz minerals in the Xu2 Mem...

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Abstract

The invention relates to the technical field of geological prospection and provides a method for determining an ancient porosity of compact sandstone in a pool-forming period. The method includes following steps: (A) obtaining reservoir lithology, sorting coefficient and diagenesis characteristics; (B) according to composition of different diagenesis characteristics in a diagenesis sequence, establishing a reservoir porosity comprehensive evolution model according to initial porosity, a porosity loss model, a porosity increase model and a crack porosity model; (C) establishing a reservoir porosity evolution history model according to a reservoir diagenesis step with combination of the reservoir initial porosity and the reservoir porosity comprehensive evolution model; (D) matching a to-be-test pool-forming period of compact sandstone gas reservoir with the reservoir porosity comprehensive evolution model to further determine the ancient porosity of the compact sandstone in the pool-forming period. By means of the method, the determined ancient porosity of the compact sandstone in the pool-forming period is obtained by means of match with the pool-forming period of the compact sandstone gas reservoir in the historical period of geology, so that a difficult problem that the ancient porosity of the compact sandstone in the pool-forming period cannot be accurately obtained in the prior art.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a method for determining the paleo-porosity of tight sandstone during the accumulation period. Background technique [0002] Tight sandstone gas has become the most important type of unconventional natural gas because of its huge reserves and wide distribution. Since there are fundamental differences in the accumulation dynamics and accumulation processes of gas reservoirs, tight sandstone gas reservoirs can be divided into The characteristics of gas reservoirs can be divided into two types. One is that the fluid shows an inverted relationship between gas and water that does not obey the principle of gravity differentiation on the profile, and the shape, size and boundary of gas reservoirs are not controlled by structural contours. The other is the tight sandstone whose trap type is mainly anticline gas reservoir or stratigraphic lithology gas reservoir, and the sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 陈冬霞庞雄奇郭迎春刘畅
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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