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Lithologic boundary identification method based on well-seismic combination

A technology of boundary identification and well-seismic combination, applied in the field of petroleum exploration and development, can solve problems such as inaccurate characterization of reservoir boundaries, reduce exploration and development costs, and improve prediction accuracy.

Active Publication Date: 2020-01-17
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0003] The purpose of the present invention is to provide a lithological boundary identification method based on well-seismic combination to solve the problem of inaccurate reservoir boundary delineation in the existing sand-mudstone velocity superposition area

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  • Lithologic boundary identification method based on well-seismic combination
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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0022] The present invention provides a lithological boundary identification method based on well-seismic combination, comprising the following steps:

[0023] 1) Obtain seismic data and well logging data in the study area, make synthetic seismic records according to the acoustic wave curve and density curve, and calibrate the main oil layers in the study area according to the synthetic seismic records.

[0024] The logging data of the wells in the study area are collected, 4 wells have sonic curves and density curves, 29 wells only have sonic curves, and only 5 wells have gamma curves.

[0025] If there are wells with missing density curves in the study area, the density curves of the wells can be obtained by converting the acoustic curves of the wells with missing density curves through Gardner-like formula.

[0026] High-quality synthetic seismic records ...

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Abstract

The invention relates to the field of petroleum exploration and development, in particular to a lithologic boundary identification method based on well-seismic combination. The method comprises the steps of obtaining seismic data and well logging data of a research area, manufacturing a synthetic seismic record according to an acoustic wave curve and a density curve, calibrating the synthetic seismic record, carrying out seismic response characteristic analysis on a main reservoir, and identifying lithologic boundaries by comprehensively utilizing a stratigraphic body slicing technology, a seismic attribute analysis technology and sand body spread characteristic research, firstly, carrying out the research of seismic attribute depiction in a research area through analysis, carrying out seismic attribute extraction in a sandstone plane spread range of the main reservoir, overcoming the defect that reservoir prediction cannot be carried out through post-stack wave impedance inversion dueto sand shale velocity stacking, improving the lithologic boundary prediction precision, and reducing the exploration and development cost.

Description

technical field [0001] The invention relates to the field of petroleum exploration and development, in particular to a lithology boundary recognition method based on well-seismic combination. Background technique [0002] With the deepening of petroleum exploration and development, it is more and more difficult to find structural reservoirs, which depend on the discovery of fault-lithologic reservoirs. However, the identification of faults and lithological traps requires not only fine structural interpretation, but also corresponding reservoir prediction work. However, for some old oil areas, due to various reasons, effective electronic logging data The unevenness, especially the lack of the density curve needed to accurately calibrate the reservoir, leads to the limitation of the corresponding geophysical analysis work. In addition, through the statistical analysis of the limited electronic data, it was found that the velocity of the sandstone and mudstone in some target i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V11/00
CPCG01V11/00
Inventor 张晓亮马玉贾艳霞王树芳朱煜华杨星庞萌
Owner CHINA PETROLEUM & CHEM CORP
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