A single-stage underwater distributary channel identification method
An identification method and channel technology, applied in the field of petroleum exploration and development, can solve the problem of not being able to clearly display the spatial changes of each branch of the underwater distributary channel
Active Publication Date: 2021-06-18
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0005] The purpose of the present invention is to provide a single-stage underwater distributary channel identification method to solve the problem that the existing methods cannot clearly show the spatial variation of each branch channel of the underwater distributary channel
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[0025] The present invention mainly recognizes the single-phase underwater distributary channel through the following principles: in the braided river delta, the top boundary of the channel sediments in the same period is isochronous, and the thickness of the top surface from the marker layer should be roughly equal. Therefore, it is possible to divide the stages of sand bodies drilled in each well according to the thickness; then, the sedimentary microfacies of the sand bodies in the same period can be studied through techniques such as core description and logging facies analysis, and the distribution direction of underwater distributary channels can be analyzed; In the distribution direction of the channel, the contact relationship between the underwater distributary channel sand bodies of adjacent wells is determined through forward modeling analysis, and each branch channel is divided; then combined with seismic attributes and seismic inversion to predict the boundaries of ...
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The invention relates to a method for identifying a single-stage underwater distributary channel. The identification method includes the following steps: 1) In the braided river delta, according to the thickness of the target layer and the marker layer, the phases of the sand bodies encountered by each well are divided; 2) The sedimentary microfacies of the secondary sand bodies in the same period are studied, and the underwater The distribution direction of the distributary channel; 3) In the distribution direction of the underwater distributary channel, the contact relationship between the underwater distributary channel sand bodies of adjacent wells is determined through forward modeling analysis, and each branch channel is divided; 4) Combined with seismic attributes and Seismic inversion predicts the boundaries of sand bodies, and determines the distribution range of each branch channel of a single-stage underwater distributary channel. The identification method of the single-stage underwater distributary channel provided by the present invention can determine the distribution range of each branch channel of the single-stage underwater distributary channel, and can more clearly display the lithology and lithofacies space of the braided river delta front facies belt Therefore, it can provide technical support for the exploration and development of complex lithology oil and gas reservoirs.
Description
technical field [0001] The invention belongs to the field of petroleum exploration and development, and in particular relates to an identification method of a single-stage underwater distributary channel. Background technique [0002] With the increasing degree of oil and gas exploration, the geological objects for exploration and development are getting smaller and more subtle, mainly small and thin sand bodies, these sand bodies belong to different branch channels due to their multiple development stages , the heterogeneity of the sand body plane is strong, which makes it difficult to deploy wells and seriously restricts the exploration and development process of oil and gas reservoirs. [0003] At present, many attempts have been made to identify single-stage underwater distributary channel sand bodies in terms of its formation mechanism, exploration and development methods, etc., but due to the complexity of single-stage underwater distributary channel sand bodies, no si...
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IPC IPC(8): G01V1/30G01V1/28
CPCG01V1/282G01V1/301G01V1/306G01V1/307
Inventor 王雷王雪梅李岩李锋于群达王黎明李智郭萌萌应森群武子钰
Owner CHINA PETROLEUM & CHEM CORP