Sectional type ground temperature gradient fitting method based on stratigraphic unconformity surface
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A geothermal gradient and segmented technology, applied in thermal method detection/exploration, geophysical measurement, complex mathematical operations, etc., can solve the problem of ignoring the length of the temperature measurement well section and the inability to truly reflect the single-stage geothermal gradient fitting, etc. problem, to achieve the effect of accurately responding to abnormal ground temperature
Inactive Publication Date: 2016-06-08
CHINA PETROLEUM & CHEM CORP +1
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[0008] The purpose of the present invention is to provide a segmented geothermal gradient fitting method based on stratum unconformity surface, to solve the problem that the length of the temperature measureme
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Embodiment 1
[0031] The segmented geothermal gradient fitting method based on the stratum unconformity surface in this embodiment uses Well Nan 79-9 in the Weigang-Baiqiu area of Nanyang Sag as the temperature measuring well, including the following steps:
[0032] 1) Obtain the stratum structure in the temperature measuring well area, obtain the geological time strata drilled from top to bottom, and determine the distribution and burial depth of the stratum unconformity surface (denudation surface) (such as figure 1 , 2 shown), the depth of the stratum unconformity is 480m;
[0033] After the drilling is completed, the well is shut down for 7 days, and when the temperature in the well returns to close to the real temperature of the formation, the temperature measuring instrument is installed to measure the temperature of the whole well;
[0034] Obtain the temperature measurement data, put the temperature measurement data into the XY coordinate system, take the temperature as the absci...
Embodiment 2
[0040] The segmented geothermal gradient fitting method based on stratum unconformity in this embodiment uses Well Nan 110 in the Weigang-Baiqiu area of Nanyang Sag as the temperature measuring well, including the following steps:
[0041] 1) Obtain the stratum structure in the temperature measuring well area, obtain the geological time strata drilled from top to bottom, and determine the distribution and burial depth of the stratum unconformity surface (denudation surface) (such as figure 1 , 2 As shown, the depth of the formation unconformity is 200m);
[0042] After the drilling is completed, the well is shut down for 10 days, and when the temperature in the well returns to close to the real temperature of the formation, a temperature measuring instrument is installed to measure the temperature of the whole well;
[0043]Obtain the temperature measurement data, put the temperature measurement data into the XY coordinate system, take the temperature as the abscissa (incre...
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Abstract
The invention discloses a sectional type ground temperature gradient fitting method based on a stratigraphic unconformity surface. The method comprises the steps of: 1) determining the distribution and burial depth of the stratigraphic unconformity surface, obtaining temperature measurement data, and drawing a ground temperature curve with the temperature and the burial depth respectively serving as a transverse coordinate and a longitudinal coordinate; 2) in the range of 0-100 m downward from the stratigraphic unconformity surface, selecting the most bending part of the ground temperature curve as a ground temperature gradient critical surface, and dividing the ground temperature curve into an upper cure and a lower curve; 3) carrying out linear fitting respectively on temperature measurement data corresponding to the upper curve and the lower curve, and obtaining an upper straight line and a lower straight line, wherein the gradients thereof are respectively the ground temperature gradients of a shallow stratum and a deep stratum and reflect the practical ground temperature field of a temperature measurement well area. The method is characterized in that according to the development characteristics of stratums in different areas, the ground temperature gradients above and below the ground temperature gradient critical surface are independently fitted, so that the ground temperature gradients of upper and lower stratums are obtained, the ground temperature field characteristics of new and old stratums are really reflected, and a reliable basis is provided for oil and gas and geothermal resources exploration, development and utilization.
Description
technical field [0001] The invention belongs to the technical field of geothermal field, and in particular relates to a segmented geothermal gradient fitting method based on stratum unconformity surfaces. Background technique [0002] Geothermal gradient is one of the most basic geothermal parameters, which is often used to describe the geothermal field characteristics of sedimentary basins. Because the generation of oil and gas is closely related to temperature, the geothermal gradient is often used in oil and gas exploration to describe the thermal state of oil and gas basins. The geothermal field of a sedimentary basin not only contains information on the origin and evolution of the basin, but is also an indispensable content for the study of hydrocarbon generation evolution and hydrocarbon accumulation of source rocks in oil and gas exploration. Petroleum exploration and geothermal workers are accustomed to using geothermal gradients instead of terrestrial heat flow to ...
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