Isochronal interface recovery method in last phase of mid-term deposition cycle of fluvial facies stratum

A sedimentary cycle and recovery method technology, applied in seismology, geophysical measurement, seismic signal processing, etc., can solve problems such as erosion damage, flooded mudstone interface does not have isochronism, and is difficult to use as isochronous strata correlation, etc., to achieve High precision, reduced ambiguity, and objective recognition results

Active Publication Date: 2017-10-13
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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Problems solved by technology

[0004] However, a complete sedimentary cycle consists of an ascending half-cycle and a descending half-cycle. When the base level falls, the river has a strong ability to erode and cut down. After a middle-term sedimentary cycle ends, the late flood mudstone is often eroded by the later-stage river downcutting. Destroyed, the preserved flooded mudstone interface is not isochronous, so it is difficult to be used as a benchmark for isochronous stratigraphic comparison
For the restoration of the isochronous interface at the end of the mid-sedimentary cycle, domestic theoretical circles have done some research work, but no substantial progress has been made

Method used

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  • Isochronal interface recovery method in last phase of mid-term deposition cycle of fluvial facies stratum
  • Isochronal interface recovery method in last phase of mid-term deposition cycle of fluvial facies stratum
  • Isochronal interface recovery method in last phase of mid-term deposition cycle of fluvial facies stratum

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0025] The present invention proposes a method for recovering the isochronous interface at the end of the mid-sedimentary cycle of a fluvial strata, comprising the following steps:

[0026] 1) Identify the undercutting mark and determine the undercutting position of the later channel. The specific process is as follows:

[0027] When the position of the later channel incision meets the following four identification marks at the same time, this position can be determined as the position of the channel incision.

[0028] ①The channel sand body thickness increased significantly in the later period, which was greater than 1.5 times the average sand body thickness of this layer;

[0029] ②The shape of the logging curve corresponding to the channel sand body in the later stage is bell-shaped or box-shaped, and the bottom is abrupt contact;

[0030] ③ The ...

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Abstract

The invention relates to an isochronal interface recovery method in the last phase of mid-term deposition cycle of the fluvial facies stratum. The method comprises the following steps that 1) an undercutting sign is identified, and an undercutting position of a post river is determined; 2) the undercutting depth of the post river is obtained; and 3) an isochronal stratum interface in last phase of mid-term deposition cycle is recovered. According to the invention, the undercutting position of the post river is identified according to logging and earthquake integrated response and sand body growth characteristics by taking a reference surface cycle theory in high-resolution sequence stratigraphy as guidance, an identification result is objective and reasonable, and and the multiplicity of solutions is reduced.

Description

technical field [0001] The invention relates to a method for recovering an isochronous interface at the end of a mid-sedimentary cycle of a fluvial stratum, and belongs to the field of oil and gas field development. Background technique [0002] Fluvial facies strata change rapidly laterally and have strong heterogeneity. The isochronous division and correlation of the strata has always been the focus and difficulty in the development of oil and gas fields. [0003] In recent years, with the introduction of the principle of high-resolution sequence stratigraphy into China, the sequence division and stratigraphic isochronal correlation technology based on base-level cycles and the ratio of accommodating space to sediment recharge flux has been gradually applied. The isochronism of flooded mudstone interfaces and internal sequence boundaries at the end of sedimentary cycles, and their control on sandbody types, superposition styles, sedimentary sequences, and geometries in sho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/6169
Inventor 范廷恩胡光义王晖王海峰张晶玉宋来明高玉飞肖大坤潘晓庆梁旭
Owner CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD
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