A method for determining the location and shape of deep fan deltas
A determination method and delta technology, applied in the field of geological exploration, can solve the problems of low main frequency, difficulty and poor seismic quality, and achieve the effect of simple and convenient operation process, clear and clear steps, and clear and accurate description.
Active Publication Date: 2017-11-21
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology
However, in deep formations, due to the lack of drilling, low seismic frequency, and poor seismic quality, deep fan deltas are not easy to identify; especially when fan delta progradation or wedge-shaped signs are not obvious, conventional seismic interpretation cannot Determining the location and shape of the fan delta
In addition, in the existing technology, geophysical techniques such as seismic slices and attribute analysis are mainly used to describe the surface characteristics of fan deltas, but it is very difficult to describe the spatial distribution of fan deltas
In summary, a feasible integrated process has not yet been formed for the identification of deep fan deltas
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[0032] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0033] Such as figure 1 Shown, a kind of deep fan delta position and the determination method of form of the present invention comprise the following steps:
[0034] 1) Collect seismic data in the target area to obtain the post-stack seismic records of the target area; in the seismic horizontal isochronous slice of the post-stack seismic records, the intersection position of the peaks or troughs of two seismic reflection axes with different directions is the trough In this way, the valley can be determined; the valley development area is selected as the research area for the development of fan delta, and the main frequency of earthquakes recorded in the post-stack seismic records in the research area is counted.
[0035] 2) Establish the geological model of the study area: set the thickness of the middle fan delta as H, where H≤100m; set the sandstone ...
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The invention relates to a position and form determining method for a deep fan delta. The method comprises the following steps that post-stack seismic record of a target area is obtained, and a research area for growth of the fan delta is determined; a geological model of the research area is established, initial values and correction step sizes of rock compositions of lower and upper stratums of the fan delta are given; value filter windows of the fan delta are determined; the value filter windows of the fan delta are used to filter the post-stack seismic record of the research area to obtain a point set of the research area; spatial points positioned in a provenance is removed from the point set of the research area to obtain a point set of a deposition area; a space of the point set of the decomposition area is marked and layered to obtain different layers of point sets; the distribution range of spatial points in the different layers of point sets are calculated, a fan-delta point set is searched to determine the position and form of a fan delta with the rock composition; the rock compositions of the lower and uppers stratums of the fan delta in the geological model of the research area is modified to determine the position and form of the fan delta with different rock compositions; and a repeated result is rejected, the position and form of the fan delta with all possible rock compositions in the target area are determined.
Description
technical field [0001] The invention relates to a geological prospecting method, in particular to a method for determining the position and shape of a deep fan delta. Background technique [0002] In the prior art, fan deltas are usually identified through conventional seismic interpretation. This method establishes a seismic interpretation model by calibrating seismic facies, and can interpret and identify fan deltas with clear shapes and large scales. However, in deep formations, due to the lack of drilling, low seismic frequency, and poor seismic quality, deep fan deltas are not easy to identify; especially when fan delta progradation or wedge-shaped signs are not obvious, conventional seismic interpretation cannot Determine the location and shape of the fan delta. In addition, in the prior art, geophysical techniques such as seismic slices and attribute analysis are mainly used to characterize the surface characteristics of fan deltas, but it is very difficult to charac...
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IPC IPC(8): G01V1/30
CPCG01V1/307
Inventor 康波徐建永吴克强何玉平武爱俊印斌浩李凡异肖伶俐陈雯雯刘子玉
Owner CHINA NAT OFFSHORE OIL CORP