Distributary channel position determination method and device

Abstract

The invention provides a distributary channel position determination method and device. The method comprises steps: a drilling well logging curve of a target layer series is acquired; according to thedrilling well logging curve, logging facies characteristics of the distributary channel are determined; according to the logging facies characteristics, the position of the distributary channel is marked on a seismic profile, and seismic facies characteristics of the distributary channel are obtained; seismic waveform inversion is carried out based on the logging curve, and the position of the distributary channel in the target layer series is obtained; according to the seismic facies characteristics, fine structure explanation is carried out on the target layer series to recover and obtain micro-palaeogeomorphology; and based on the seismic facies characteristics, the position of the distributary channel obtained through inversion and the micro-palaeogeomorphology, distribution of the distributary channel in the target layer series is obtained. The technical problem that the distribution characteristics of the distributary channel in a shallow water delta can not be simply and efficiently recognized, and a reservoir is caused to be hard to predict can be solved, and the technical effect of simply and efficiently predicting the reservoir are achieved.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a method and device for determining the position of a distributary channel. Background technique [0002] With the continuous improvement of oil and gas exploration technology, it is more and more difficult to discover structural oil and gas reservoirs, and the discovered reserves are getting smaller and smaller. Under this trend, the exploration of lithologic reservoirs becomes more and more important. In recent years, many lithologic oil and gas reservoirs have been discovered in various oil fields, especially some oil and gas production can reach more than 50 million tons per year. In the past, for faulted lake basins with developed break zones, the distribution characteristics of reservoirs could be predicted by identifying slope break zones. However, for shallow lake basins without broken zones, the distribution of reservoirs can be predicted by predicting t...

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Problems solved by technology

[0005] 1) The terrain of the ancient lake is relatively flat, and it is difficult to identify the characteristics of the ancient river channel on the seismic profile;

[0006] 2) Sandstone is well developed, with single sand bodies superimposed on each other vertically with large thickness changes, fast lateral migration, cross compounding, and poor stability;

[0007] 3) The thickness of the effective sand body is relatively thin, the vertical distribution is relatively scattered, and the lateral variation is large;

[0009] For this type of paleotopographic features, it is difficult to accurately characterize the distribution of reservoirs in shallow water deltas using 3D seismic data

[0010] For the above problems, no effective solutions have been proposed so far

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