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Method for seeking lithological anomalous body using orthogonal seismic trace data

A technique for seismic traces and anomalous bodies, applied in the field of seismic exploration and oil exploration two-dimensional seismic data interpretation, which can solve problems such as indistinguishability

Active Publication Date: 2005-04-06
PETROCHINA CO LTD
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Problems solved by technology

Overcome the problem that the 2D seismic data cannot distinguish when the thickness of the lithological anomaly body is less than 1 / 4λ but greater than or equal to 1 / 8λ

Method used

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  • Method for seeking lithological anomalous body using orthogonal seismic trace data
  • Method for seeking lithological anomalous body using orthogonal seismic trace data
  • Method for seeking lithological anomalous body using orthogonal seismic trace data

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Embodiment Construction

[0022] Example: Using the orthogonal seismic traces based on conventional migration seismic data, the Silurian interior amplitude anomaly area, that is, the distribution range of lithological anomalies, was found in the Tazhong 32 well area.

[0023] In the Tazhong 32 and 34 well areas of the Tarim Basin, the Silurian is a monocline uplifted from north to south, and the anticline structure is not developed. In 1995, Well Tazhong 32 was drilled in this area to target the denudation trap of the Silurian bituminous sandstone, and a 1.1-meter oil and gas show was discovered in the Silurian 3791.71-3792.81 well section. Among them, the oil immersion is 0.77 meters, and the oil stain is 0.33 meters. In the second year, Well Tazhong 34 was drilled at the high position of the denuded trap of Silurian bituminous sandstone 5km southeast of the well, but no oil and gas shows were found. According to the drilling results of the two wells, the Silurian denudation traps lack effective cap ...

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Abstract

This invention relates to a gas oil field exploration method and belongs to oil exploration two-dimension earthquake material explanation technique field. The method comprises the following steps: first to figure out the cross earthquake channel; second to compare the explanation of two dimension earthquake; third to extract average vibration and form plane graph and display vibration abnormal area. It can identify the rock abnormal body according to regular excursion earthquake materials and crossing earthquake channel material vibration information difference and the longitudinal resolution rate of the two amounts to one-eighth lamda.

Description

technical field [0001] The invention relates to the technical field of seismic exploration for oil and gas exploration and development, in particular to a method for searching for lithologic anomalies by using conventional two-dimensional seismic data. Convert conventional seismic data to orthogonal seismic data to find lithological anomalies. This method belongs to the field of oil exploration two-dimensional seismic data interpretation technology (international classification: G01V 1 / 28). Background technique [0002] At present, there are three main methods to find lithological anomalies by using seismic exploration technology: ① Seismic reflection pattern discrimination method: predict the place and type of sand bodies that may develop according to the sequence stratigraphy model established in a certain area, and then combined with seismic facies analysis, according to the profile Identify the existence of special lithology bodies by the upper seismic reflection struct...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 李毓丰
Owner PETROCHINA CO LTD
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