New karst stage judgment method
A discrimination method and karst technology, which can be used in material inspection products, soil material testing, etc., can solve problems such as unreliability and technical reports that do not discriminate the karst stage, and achieve the effect of improving the precision and accuracy of discrimination.
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Embodiment 1
[0076] Taking the identification of carbonate rock karst stages in the Halahatang area in the northern Tarim Basin as an example, previous studies mainly based on the unconformity on the seismic section. Since the wells drilled in the study area are generally deep and there are few wells, it is difficult to identify The exposed signs can be directly identified on the core to distinguish the karst stage. In the 78 wells in the study area, a total of 22 effective samples were obtained, and the carbon and oxygen isotope values (mainly measured 13 C PDB and δ 18 o PDB ) and inclusion homogeneity temperature data, and using the measured data (Table 4, Table 5), the carbon and oxygen isotope values are calibrated to the carbon and oxygen isotope maps obtained above, and there are distributions in all five areas ( Figure 12 ), indicating that five phases of filling also occurred in the Halahatang area. The average homogeneous temperature distribution map established by using...
Embodiment 2
[0083] Taking the Tahe Oilfield as an example, the karst identification period is explained. Compared with Halahatang, the Tahe Oilfield has relatively more cores, and some of the cores can be identified with exposure signs, but it is still not enough to provide direct evidence for the identification of karst stages. According to the method of the present invention, 32 data carbon and oxygen isotope values (Table 6) are used to calibrate to the established carbon and oxygen isotope map, and 4 regions distributed therein ( Figure 14 ), indicating that the Tahe Oilfield had four stages of filling. However, the average homogeneous temperature distribution map ( Figure 15 )and Figure 9 The comparison shows that there have been four periods of fluid activities in the Tahe River.
[0084] Table 6 Carbon and oxygen isotope data of some rocks in Tahe Oilfield
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δ 13 C (PDB)
δ 18 O(PDB)
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δ 13 C ...
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