Karst period ancient fracture depicting method and device

A karst and seismic wavelet technology, which is applied in the field of ancient fault characterization methods and devices in the karst period, can solve the problems of considering fault types and development levels, and achieve the effect of improving prediction accuracy and efficiency.

Pending Publication Date: 2022-05-06
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

On the other hand, insufficient consideration is given to the type and development level of the fracture, and the direction and length of the fracture are simply described on the plane

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  • Karst period ancient fracture depicting method and device
  • Karst period ancient fracture depicting method and device
  • Karst period ancient fracture depicting method and device

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Embodiment Construction

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0031] The present invention forms a refined method and device for depicting paleo-faults in the karst period, so as to solve the current problem of optimizing "sweet spots" for weathered crust-type reservoirs. Such as figure 1 and figure 2 Shown, the present invention is realized through the following steps:

[0032] Step 201: Seismic horizon calibration and fine interpretation

[0033] The seismic horizon calibration and fine interpretation refer to: extracting well side channel seismic wavelets, obtaining synthetic records according to the well side channel sei...

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Abstract

The invention discloses a karst stage ancient fracture description method and device, and the method comprises the steps: extracting well bypass seismic wavelets for synthetic recording, and achieving the well seismic calibration of a karst reservoir top interface and all overburden velocity control layers including the maximum flooding surface, and the skeleton section interpretation and encryption interpretation; time-depth conversion is carried out on well bypass seismic wavelets and horizon interpretation results; horizon leveling is carried out on the depth domain seismic well bypass seismic wavelets; performing imaging enhancement processing on the leveled and reconstructed seismic data volume; fusing the extracted sensitive seismic attributes on the processed seismic data; fitting the calculated plane extension length of the fracture with the maximum vertical fault displacement on the karst ancient fracture plane prediction map; and classifying and grading the ancient fractures in the karst period based on the fitting result, and projecting the ancient fractures to the ancient landform map of the top surface of the reservoir in the karst period to finish final description. According to the method, rapid identification and grading classification of karst fractures can be realized, and the prediction precision and efficiency are improved.

Description

technical field [0001] The invention relates to the technical field of geophysical signals and geophysical interpretation, in particular to a method and device for depicting paleo-faults in the karst period. Background technique [0002] This section is intended to provide a background or context to embodiments of the invention that are recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] The results of oil and gas exploration in recent years show that the major large-scale sedimentary basins in the world have developed carbonate rock paleo-weathered crust type oil and gas reservoirs, and about 30% of them are closely related to regional unconformity. The paleokarst reservoirs formed by the carbonate rocks exposed to the surface after being buried early and then subjected to weathering and leaching provide effective storage places for oil and gas reservoirs. Regarding the formation of weathered and crusted c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/50
CPCG01V1/50G01V2210/624G01V2210/6169
Inventor 林煜巫芙蓉李磊郁智贺川航李春梅
Owner BC P INC CHINA NAT PETROLEUM CORP
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