Sedimentary basin type underground heat resource classification method

Abstract

The invention provides a sedimentary basin type underground heat resource classification method. The method comprises the steps that 1) tectonic zones of a sedimentary basin are divided by utilizing well drilling, logging, well logging and earthquake data and the like; 2) lithological combination and thickness of the stratum are determined for different tectonic zones; 3) the thermal conductivities of different lithological stratums are made clear via rock core sampling test; 4) shaft temperature measuring data of the tectonic zones is obtained, and distribution of the ground temperature gradient is determined according to the shaft temperature measuring data; 5) the ground heat flow value is calculated by utilizing the thermal conductivities of different lithological stratums and the ground temperature gradient comprehensively via a geothermic formula, and the planar distribution rule of the ground heat flow value is made clear; and 6) sedimentary basin type underground heat resource is classified according to the planar ground heat flow value. The method is highly operable, and can be used to provide more accurate methods and materials for research on geothermal reservoir reasons, evaluation of underground heat resource amount and research on development and utilization area selection of the underground heat resource.

Description

technical field [0001] The invention relates to the field of geothermal resource evaluation, in particular to a method for classifying types of sedimentary basin-type geothermal resources. Background technique [0002] The classification of geothermal resource types is the basis for the evaluation of geothermal resources. The evaluation of geothermal resources includes the amount of heat storage, the amount of exploitable fluids, and the evaluation of the amount of recyclable geothermal resources based on recharge. It is of great significance to study the causes, development and utilization of constituencies. [0003] At present, the division of geothermal resource types is mainly based on the distribution of geothermal anomaly areas, the distribution of heat storage forms, the scale of heat storage, and the complexity of structures. The analysis mainly focuses on the distribution range of heat storage, and the structural complexity mainly refers to the development of fault...

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Problems solved by technology

[0004] However, for sedimentary basins, especially the rift-type sedimentary basins in eastern China, due to the mantle-derived heat flow caused by faulting activities and the crust-derived heat flow formed by the decay of radioactive elements in crustal rocks, a large amount of heat flow is radiated to the outside of the earth along the solid rock layer. Almost the entire sedimentary basin They all belong to the geothermal anomaly area, and the sandstone heat reserves are widely distributed in the whole area at the end of the fault depression, the activity of the fault structure zone is weakened, and the overall structural conditions are relatively simple

In this case, the entire sedimentary basin like the Jiyang Depression can be classified as one type of geothermal resources. It is difficult to achieve a reasonable division of geothermal resource types, which makes it difficult to evaluate the amount of geothermal resources, especially the amount of recyclable geothermal resources.

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