A method for identification of denuded surface valley reservoirs

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An identification method and denudation surface technology, which is applied in the field of identification of denudation surface valley reservoirs, to achieve the effect of improving the identification rate

Active Publication Date: 2017-02-01

CHINA PETROLEUM & CHEM CORP +1

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For the valley reservoirs in this special situation, there is no complete and mature technical method to accurately identify them

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[0024] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0025] The present invention is a method for identifying valley reservoirs on denuded surfaces with the help of existing seismic and drilling data. The specific implementation process of the present invention will be described in detail below by taking the three-dimensional seismic data of a work area as an example. The three-dimensional work area The working area of seismic data is 215km 2 , before applying the denudation surface valley reservoir identification method proposed by the present invention to the work area, four exploration wells, A1, A2, B1, and B2, have been drilled, wherein A1 and A2 wells have found oil reservoirs on the denudation surface, and B1 and B2 wells have No reservoirs were obtained on the denuded face. In this work area, due to the great difference in wave impedance of the upper and lower formations on the denu...

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Abstract

The invention, which belongs to the technical field of oil exploration and development, relates to an identification method of a denudation plane valley oil reservoir. According to the method, a denudation plane seismic horizon and a reference seismic horizon are generated by tracking, the reference seismic horizon is used as a datum plane to execute flattening processing, the denudation plane seismic horizon is restored to an ancient landform state, and a valley position is determined; frequency spectrum decomposition data are extracted from a curved surface parallel to the denudation plane in a same-phase shaft range where the denudation plane is located and mixed displaying is carried out on energy at three different frequency bands; frequency ranges and energy weights of the three frequency bands are adjusted and a frequency combination graph fitting the drilled well oil reservoir situation is screened; and the frequency combination graph covers a three-dimensional visualized graph displayed at the denudation plane ancient landform and a possible oil reservoir region is identified in the valley. The provided method is simple and is easy to implement; and the identification rate of the oil reservoir can be effectively improved. The method is especially suitable for the landform whose stratum filling in the shallow valley is thin at the denudation plane.

Description

technical field [0001] The invention relates to a method for identifying denuded surface valley reservoirs, belonging to the technical field of petroleum exploration and development. Background technique [0002] In the process of formation deposition, due to long-term weathering, denudation, scouring, and filling, the denuded surface often forms valleys filled with reservoirs. If the overburden is in good condition and the dip angle of the formation is appropriate, when oil and gas migrate to the valley, it will Denuded surface valley reservoirs can be formed. [0003] Previous studies on denuded surface valley reservoirs are not many, and a complete and effective technical method has not been formed. Among the existing patents, some identify oil reservoirs in the wellbore based on well log curve analysis, some identify favorable areas of oil reservoirs by analyzing the matching relationship between paleostructures and hydrocarbon generation periods, and some use seismic w...

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Patent Type & Authority Patents(China)

IPC IPC(8): G01V1/28

Inventor 王鹏飞杨振峰于群达杨春峰

Owner CHINA PETROLEUM & CHEM CORP