A method for identification of channel sand bodies

Abstract

The invention discloses a river sand identification method, and belongs to the field of oil field reservoir stratum prediction. The method comprises that earthquake collection is carried out on a target work area containing river sand, earthquake data is obtained, and logging is carried out in the target work area to obtain logging data; the earthquake horizon is interpreted by means of the earthquake data, and the sand thickness, sedimentary facies and exploitation horizons are interpreted by means of the logging data; well-earthquake calibration is carried out by using the earthquake horizon, sand thickness, sedimentary facies and exploitation horizons, and a well-earthquake calibration result is obtained; spatial horizons of a sand group, a little layer and a sedimentary unit in the time domain are established according to the well-earthquake calibration result; the type of the sedimentary facies is obtained, the spatial horizons of the sand group, little layer and sedimentary unitare vertically combined according to the type of the sedimentary facies, and a framework model is obtained; and distribution characteristic of the river sand in the target work area is identified viathe framework model. Thus, the distribution characteristic of river sand in different thicknesses can be identified more accurately.

Description

technical field [0001] The invention relates to the field of oil field reservoir prediction, in particular to a channel sand body identification method. Background technique [0002] In oilfield exploration and development, the research on channel sand body is the key to enhance oil and gas recovery. In particular, in the later stage of oilfield exploration and development, identifying the distribution characteristics of channel sand bodies will make it easier to excavate oil and gas and improve oil and gas recovery. It can be seen that in order to enhance oil and gas recovery, it is very important to provide a method to identify the distribution characteristics of channel sand bodies. [0003] The existing technology provides a channel sand body identification method, including: step 1, logging in the target work area to obtain logging data, and performing seismic acquisition on the target work area to obtain seismic data. Step 2. Under the constraints of the framework mo...

AI Technical Summary

Problems solved by technology

[0005] In the process of identifying the distribution characteristics of channel sand bodies in the existing technology, the distance between the top interface and the bottom interface of the frame model established on the scale of seismic interpretation layer is too large, which is only suitable for channel sand bodies at the level of reservoir group scale (that is, thick layers In the frame model established with the well point sedimentary unit as the basic unit and using the spatial difference method, the distance between the top interface and the bottom interface of the sedimentary unit is small, which is only suitable for thin channel sand bodies. body recognition

It can be seen that the existing technology is poor in identifying channel sand bodies with uneven thickness distribution

Images