Carbonate rock weathering crust karst reservoir thickness earthquake prediction method and device

A carbonate rock and seismic prediction technology, applied in the field of seismic exploration, can solve the problems of inability to meet the quantitative prediction of karst reservoirs and strong multi-solvability, achieve high horizon interpretation accuracy, uniform lithology, and improve the reservoir quality. The effect of prediction accuracy

Inactive Publication Date: 2018-02-06
PETROCHINA CO LTD
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the disadvantages of quantitative prediction of karst reservoirs and strong multi-solution in the above-mentioned prior art, the object of the present invention is to provide a method and device for seismic prediction of the thickness of karst reservoirs in carbonate rock weathering crust

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Carbonate rock weathering crust karst reservoir thickness earthquake prediction method and device
  • Carbonate rock weathering crust karst reservoir thickness earthquake prediction method and device
  • Carbonate rock weathering crust karst reservoir thickness earthquake prediction method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0064] The embodiment of the present invention provides a method for seismic prediction of the thickness of carbonate rock weathering crust karst reservoirs. In this implementation, the Permian weathering crust karst reservoirs in the central Sichuan area of ​​the Sichuan Basin are selected. figure 1 It is a flowchart of an embodiment of the present invention. As shown in the figure, the method includes:

[0065] S101, acquiring seismic data and well logging data

[0066] Specifically, the migrated seismic data, time-structural horizons on the top of the weathering crust, and well-drilled well logging data are obtained from the oil field, where the logging data include the acoustic time difference and density curves of the upper and lower intervals on the top of the weathering crust.

[0067] The unconformity surface of the weathering crust should preferably have a long depositional discontinuity and relatively strong dissolution. Syngenetic or penecontemporaneous karstificat...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a carbonate rock weathering crust karst reservoir thickness earthquake prediction method and device; the method comprises the following steps: obtaining earthquake data and logging data; making statistics of an average wave impedance value of a cap rock, a carbonate rock stratum and a karst reservoir layer; building a wedge shape karst reservoir layer wave impedance model; synthetizing an earthquake forward modeling profile of the wave impedance model; extracting earthquake attributes of the earthquake forward modeling profile along the weathering crust top surface, andcarrying out polynomial fitting for the earthquake attributes and the reservoir thickness; extracting the horizon earthquake attributes and predicting the reservoir thickness. The method can fully utilize the earthquake attribute information, thus improving the karst reservoir transverse prediction precision; the method uses the earthquake forward modeling of reservoirs of different thickness to build a quantification transition relation between the reservoir thickness and the earthquake attributes, thus guiding the actual earthquake data for reservoir thickness predictions, and realizing thefavorable karst reservoir growth zone quantification predictions.

Description

technical field [0001] The invention belongs to the technical field of seismic exploration, and relates to a seismic prediction method and device for the thickness of a carbonate weathering crust karst reservoir. Background technique [0002] Paleokarsts in deep marine carbonate rocks are widely developed in China and are one of the main gas-producing layers. However, karst reservoirs have strong heterogeneity, and the degree of karst development sometimes varies greatly at close distances, reflecting rapid lateral changes in reservoirs. Strong reservoir heterogeneity largely limits the exploration of karst oil and gas reservoirs. Currently, the prediction of karst reservoirs is a difficult problem in the exploration of carbonate karst oil and gas reservoirs. [0003] Early karst reservoir predictions were mostly based on structures and faults, and the correlation between structures and karsts was used for reservoir prediction. In recent years, seismic facies interpretatio...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01V11/00
CPCG01V11/00
Inventor 戴晓峰张明甘利灯李凌高
Owner PETROCHINA CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products