Method for determining reservoir physical property of sandstone before cementation

Abstract

The invention relates to a method for determining a reservoir physical property of sandstone before cementation. In the method, based on measurement of a physical property of early strongly cemented sandstone, that is, measurement of porosity phi0 and permeability K0, a dilute acetic acid solution is used to dissolve cement in the early strongly cemented sandstone, to restore a sandstone status before the sandstone is strongly cemented. Then, a physical property of a sandstone sample is directly measured, and porosity phi1 and permeability K1 obtained from the measurement are the reservoir physical property before the cementation, so as to determine the reservoir physical property before the cementation. The method effectively avoids a human factor effect in a statistics and calculation process, is more consistent with an actual geological condition, and has a more accurate result.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploration and development, and in particular relates to a method for determining the physical properties of sandstone reservoirs before cementation occurs. Background technique [0002] With the continuous improvement of oil and gas exploration in the middle and shallow layers and the increasing demand for oil and gas reserves, the target of oil and gas exploration has gradually shifted to the deep layer. The potential of deep oil and gas resources in my country is huge, and oil and gas exploration has achieved gratifying results. Medium-deep sandstone reservoirs have undergone complex diagenetic transformation during the burial process, and the reservoir porosity has also undergone complex evolution processes in the geological history period. The matching relationship between the reservoir porosity evolution history and the hydrocarbon generation and expulsion history of source...

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Problems solved by technology

[0004] Aiming at the above-mentioned problems such as inaccurate acquisition of sandstone reservoir physical properties by existing methods, the present invention provides a method for determining the physical properties of sandstone reservoirs before cementation occurs, which can accurately determine the physical properties of sandstone reservoirs before strong acid salt cementation occurs, which is a great contribution to geology. Provide reference for physical property evolution restoration of sandstone reservoirs in historical period

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