A method for predicting fractured igneous rock reservoirs based on prestack azimuth gathers

A front azimuth and azimuth technology, applied in the field of comprehensive oil and gas exploration, can solve the problems of S-wave influence, high exploration cost, low signal-to-noise ratio and low frequency, etc., and achieve the effect of low cost

Active Publication Date: 2017-06-16
CHINA PETROLEUM & CHEM CORP +1
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  • Description
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Problems solved by technology

However, the S-wave is seriously affected by the surface, and the signal-to-noise ratio and frequency are low; multi-component seismic, multi-azimuth VSP, and P-S converted wave technologies have good results, but either the exploration costs are high, or unconventional seismic acquisition projects are difficult to obtain in many areas. widely used

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  • A method for predicting fractured igneous rock reservoirs based on prestack azimuth gathers
  • A method for predicting fractured igneous rock reservoirs based on prestack azimuth gathers
  • A method for predicting fractured igneous rock reservoirs based on prestack azimuth gathers

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Embodiment 1

[0039] Example 1. figure 1 A schematic flow chart of a method for predicting fractured igneous rock reservoirs based on pre-stack azimuth gathers provided by the present invention, as shown in figure 1 As shown, the method includes the following steps:

[0040] The first step is to analyze the azimuth and offset of the pre-stack seismic data volume, and draw up a sub-azimuth processing scheme.

[0041]Determine the range of offsets by analyzing the azimuths and offsets of the pre-stack seismic data volume, and determine the number of azimuths and specific azimuths that need to be divided by analyzing the signal-to-noise ratio of the actual seismic data and the actual bin coverage times angle range. Generally speaking, for the processing of offsets, it is necessary to properly discard part of the near-offset and far-offset data, because the near-offset cannot reflect the azimuth heterogeneity of the fracture, and the azimuth of the far-offset is often incomplete. The divisio...

Embodiment 2

[0059] Example 2. A method for predicting fractured igneous rock reservoirs based on pre-stack azimuth gathers, characterized in that it includes the following steps:

[0060] 1) Determine the offset range through the azimuth and offset analysis of the pre-stack seismic data volume, and determine the azimuth division scheme by analyzing the signal-to-noise ratio of the actual seismic data and the actual bin coverage times;

[0061] 2) According to the distribution of the coverage times in the study area, the gather superposition superbin is established;

[0062] 3) According to the azimuth division scheme, divide the superbins of the gathers and stack them, and check the stacking quality; if the energy difference of the obtained seismic data at different azimuths exceeds the limit value, return to step (1), and re-determine the azimuth division scheme and trace Set superposition hypersurfing;

[0063] 4) Migrate the stacked data volumes with different azimuth angles by using...

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Abstract

The invention discloses a method for predicting fractured igneous rock reservoirs based on pre-stack azimuth gathers, comprising the following steps: determining the azimuth division scheme; establishing gather superposition superbins; dividing gather superbins according to the azimuth division scheme And perform stacking, and check the stacking quality, if the energy difference of the obtained seismic data at different azimuths exceeds the limit value, repeat the above steps; use the static positive stacking velocity to migrate the stacked data volumes at different azimuths, and merge them into one result Data volume; calculate relative wave impedance data volume and seismic attribute data volume; optimize sensitive attributes to fit fracture anisotropy, and combine fluid detection to point out favorable fracture reservoir development zones. The present invention detects fracture development characteristics in igneous rocks by analyzing the anisotropy of pre-stack azimuth gathers based on conventionally collected longitudinal wave data in wide azimuths, and can greatly improve the accuracy of fracture prediction in igneous rocks.

Description

technical field [0001] The invention relates to the field of comprehensive oil and gas exploration, in particular to a method for predicting fractured igneous rock reservoirs based on pre-stack azimuth gathers. Background technique [0002] In recent years, with the deepening of oil and gas exploration in unconventional reservoirs, igneous rocks have gradually become a new research hotspot in reservoir prediction. As an important factor affecting the formation of effective reservoirs in igneous rock formations, the description of fracture development characteristics has become a research focus and difficulty in the discipline. In a broad sense, reservoir fractures (according to R.A.Nelson, 1985) refer to macroscopic planar discontinuities naturally existing in rocks formed by deformation or physical diagenesis, ranging from fractures to micro-cracks. Inside. Fractured reservoirs are defined as reservoirs in which naturally occurring fractures have a significant influence, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
Inventor 陈学国相鹏谭绍泉胡加山郝志伟时秀朋李竹强郭涛于会臻李云平李守济王有涛王月蕾
Owner CHINA PETROLEUM & CHEM CORP
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