New hydro-thermal enclosed type underground heat resource quality classification evaluation method

Abstract

The invention provides a new hydro-thermal enclosed type underground heat resource quality classification evaluation method, comprising steps of calculating and determining distribution characteristics of ground temperature gradient and heat storage temperature according to temperature test materials obtained during the oil gas exploration process, determining thickness and permeability of heat storage sandstone through well logging, logging and test data which are obtained through the oil gas exploration process, determining heat generation power of a single well of each heat storage system, determining profit distribution intervals of heat generation power profit of various single wells and performing first-level classification dividing, determining heat flow supply parameter of various structures and performing second level classification dividing, and performing geothermal resource classification evaluation by integrating the first level and the second level classification dividing. The new hydro-thermal enclosed type underground heat resource quality classification evaluation method can realize quality classification evaluation of hydro-thermal enclosed type underground heat resource and provides a prerequisite condition for the following underground heat resource exploitation utilization and area selection.

Description

technical field [0001] The invention relates to the research field of geothermal resource quality classification and evaluation, in particular to a new hydrothermally sealed geothermal resource quality classification and evaluation method. Background technique [0002] The classification and evaluation of geothermal resource quality is mainly aimed at evaluating the utilization potential of geothermal resources, which is the premise basis for the development and utilization of geothermal resources, and is of great significance for the selection of favorable areas for geothermal resources. [0003] At present, the classification and evaluation of the quality of geothermal resources is mainly based on the content of chemical components of geothermal fluids, the temperature of geothermal fluids, the depth of geothermal wells, the unit output of geothermal fluids in geothermal wells, the recoverable volume of geothermal fluids and their productivity. Among them, the determinatio...

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Problems solved by technology

[0004] However, for the rift-type sedimentary basins in eastern China dominated by hydrothermal geothermal resources, geothermal fluids generally have high salinity, strong scaling and corrosiveness, and are less likely to be used for mineral spring development and utilization. The temperature of geothermal fluid is mainly 40°C-90°C, which can be mainly used for heating. Therefore, the scope of geothermal utilization determined by the chemical composition of geothermal fluid and fluid temperature is meaningless for the quality classification and evaluation of geothermal resources; The depth, the unit output of geothermal fluid in geothermal wells, and the production capacity of geothermal wells cannot make a comprehensive evaluation of the economics of geothermal development and utilization, especially geothermal heating. For hydrothermally sealed geothermal resources, geothermal tail water recharge is required to maintain formation pressure. It is an important measure for the development and utilization of this type of geothermal resources. The current quality classification evaluation method does not take into account the heating capacity of the recharged low-temperature fluid due to the difference in terrestrial heat flow supply, which creates difficulties for the quality classification evaluation of geothermal resources and the selection of favorable areas.

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