Method to complement lost stratum under shaft

A stratigraphic and geological technology, applied in the direction of seismology for well logging records, can solve problems such as attribute control point distortion, failure of target layer physical property change, etc., and achieve the effect of improving accuracy

Active Publication Date: 2013-07-24
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

If an oil reservoir is found near a normal fault and a well site is arranged to drill the normal fault, there will be missing formation information on both sides of the section during logging data collection and lithology

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  • Method to complement lost stratum under shaft
  • Method to complement lost stratum under shaft
  • Method to complement lost stratum under shaft

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with accompanying drawings and examples.

[0032] The present invention utilizes statistics of the physical property characteristics of the overlying stratum and the underlying stratum of the target stratum to construct the information of the missing strata and supplement the missing strata downhole.

[0033] The specific embodiment of the present invention is:

[0034] 1) Collect the seismic data of the work area, process the pre-stack seismic data, and obtain the post-stack seismic data volume;

[0035] The processing includes surface consistent amplitude processing and surface consistent deconvolution processing, velocity analysis, dynamic correction and residual static correction, residual amplitude compensation, stacking and migration processing to form post-stack seismic data.

[0036] 2) On the seismic data, according to the reflection characteristics of the reflected wave, the geological dat...

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Abstract

Provided is a method to complement a lost stratum under a shaft. The method improves inversion efficiency and the accuracy rate. The method includes the steps of confirming mutually linked and sealed geological blocks according to reflection characteristics of earthquake reflection waves and geological data, allocating shaft data to the geological blocks according to tracks of the measured shaft, confirming the position of a crossed contact point formed when the shaft penetrates through a section of a normal fault according to all the tracks of the shaft in a work area, calculating thicknesses of an upper stratum and a lower stratum and the position and the thickness of the lost stratum at the crossed contact point, confirming structure characteristics of the lost stratum, rebuilding a stratum sequence section close to the lost stratum to complement the lost stratum, and carrying out earthquake inversion with a result as an original value and a restraint condition of the inversion. The geological characteristics of the upper stratum and the lower stratum are effectively used, the lost stratum is built, on the basis that known data with various sources are fully made use of, lost data are predicted, the result conforms to the geological characteristics, and precise description for change conditions of internal physical properties of a target stratum is benefited in the earthquake inversion.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas exploration and development, aims to use computer technology to invert and estimate the spatial distribution and internal physical property change characteristics of the target layer based on seismic data and stratum geological data, and provides a supplementary underground missing stratum to constrain the seismic response Deduce the method of accurately predicting the change law of formation wave impedance, and serve for reservoir prediction and oilfield development. Background technique [0002] Geophysical inversion is a method of using observed data to infer the spatial distribution of strata and the change of physical properties inside the stratum. If only ground-observed seismic data are used for inversion, the prediction results will have large errors and low computational efficiency. In order to solve this problem, combined with the structural interpretation results of the target ...

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Application Information

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IPC IPC(8): G01V1/40
Inventor 王汉钧张红英陈亚军詹仕凡万忠宏赵剑王子兰
Owner BC P INC CHINA NAT PETROLEUM CORP
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