Single-stage underwater distributary channel identification method

An identification method and technology of river channels, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problem of not being able to clearly display the spatial changes of various branches of underwater distributary channels

Active Publication Date: 2019-11-05
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...

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  • Single-stage underwater distributary channel identification method
  • Single-stage underwater distributary channel identification method
  • Single-stage underwater distributary channel identification method

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Embodiment Construction

[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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Abstract

The invention relates to a single-stage underwater distributary channel identification method. The identification method includes the following steps: 1) in a braided river delta, classifying stages of drilling sand bodies of each well according to the thickness from a target bed to a marker bed; 2) studying sedimentary microfacies of sand bodies of the same stage, and analyzing distribution directions of underwater distributary channels; 3) in the distribution directions of the underwater distributary channels, classifying all underwater distributary channels according to contact relations ofunderwater distributary channels of adjacent wells; and 4) determining a distribution range of all distributary channels of underwater distributary channels of a single stage according to seismic properties and boundaries of seismic inversion in predicting sand body distribution. The single-stage underwater distributary channel identification method provided by the invention can determine a distribution range of all distributary channels of underwater distributary channels of a single stage, and more clearly display spatial variations of lithology and lithofacies of a front belt of a braidedriver delta so as to further provide technical support for the exploration and exploitation of complex lithologic 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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Application Information

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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
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