Method for analyzing preservation or not of early particle dissolution pores of sandstone in burial compaction process

Abstract

The invention relates to a method for analyzing the preservation or not of early particle dissolution pores of a sandstone in the burial compaction process. The method concretely comprises the following steps: S1, preparing an earth surface modern deposit sample having the same structural fabric with a middle-deep stratum sandstone rock; S2, obtaining the real stratum water density of the actual stratum of the middle-deep stratum sandstone, the overlying stratum density, the earth temperature gradient and the earth surface average temperature, and calculating the pore fluid pressure, the static rock pressure and the stratum temperature meeting actual geologic conditions; S3, carrying out a mechanical compaction simulation experiment meeting the actual geologic conditions on the sample; S4,processing the sample after the experiment; and S5, analyzing the experiment sample and experiment data. The method can truly reflect the final preservation condition of the early particle dissolution pores after the modern earth surface deposit rich in the early particle dissolution pores is buried and compacted.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploration and development, and in particular relates to an analysis method for analyzing whether the dissolved pores of early particles of sandstone can be preserved during burial and compaction, which is used for the analysis of dissolved pores of early particles of sandstone. Background technique [0002] With the continuous improvement of oil and gas exploration and the increasing demand for oil and gas resources, the focus of oil and gas exploration in clastic rocks has gradually shifted to medium-deep reservoirs with a burial depth greater than 2500 m, and medium-deep sandstones have become important oil and gas exploration targets. Detrital particles such as feldspar and quartz are important constituent minerals of continental sandstones in my country, and the dissolved pores of feldspar particles are important oil and gas storage spaces in middle-deep sandstones. The fel...

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Problems solved by technology

[0006] Aiming at the problem in the prior art that it is impossible to effectively determine whether the dissolved pores of early particles in sandstone can be preserved during the burial process, the present invention provides an analysis method for whether the dissolved pores of early particles in sandstone can be preserved during the burial process, and the method can be more accurate. It truly reflects the final preservation of early grain-dissolving pores after burial and compaction of modern surface sediments rich in early grain-dissolving pores

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