A New Method for Determining Underground Confined Water Level

Abstract

The present invention provides a new method for determining underground pressure water levels, which includes (1) collecting all geophysical well logging data in the research area, drawing mudstone compaction curves and identifying normal compaction layers; (2) collecting The chemical data of groundwater in the study area are used to identify the relatively open water system environment. Combined with the division results of normal compaction layers in step (1), the open system of the formation is determined; (3) Collect and organize the measured pressure data of drilling wells in the study area, and calculate The sum of the altitude value of the measured pressure in the open system and the height of the hydrostatic column corresponding to the measured pressure is used to obtain the pressure-bearing water level of the well based on sea level; (4) Organize the calculated pressure-bearing water level and the well location coordinate data of the corresponding well , save it as xls. format in Excel, input it into Surfer, Geomap and other software, and finally get the planar distribution map of the pressure water level within the study area. The invention has the advantages of simplicity, efficient prediction, strong practicability, etc., and greatly improves the accuracy of formation pressure system division.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering investigation, and in particular relates to a new method for determining an underground confined water level. Background technique [0002] At present, the calculation of hydrostatic pressure is based on the assumption that the water column reaches the surface, but the actual hydrostatic pressure is calculated from the confined water level, which often does not coincide with the surface, resulting in calculation errors for abnormal formation pressure. Therefore, the determination of the confined water level is essential for the calculation of formation abnormal pressure. [0003] However, in actual surveys, petroleum geologists often ignore the importance of confined water levels due to ignoring the study of groundwater systems, and in the industry, field drilling water head data in hydrogeology are scarce, making it inconvenient to calculate formation hydrostatic pressure and jud...

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Problems solved by technology

[0003] However, in actual surveys, petroleum geologists often ignore the importance of confined water levels due to ignoring the study of groundwater systems, and in the industry, field drilling water head data in hydrogeology are scarce, making it inconvenient to calculate formation hydrostatic pressure and judge pressure anomalies. and make the result error larger

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