Identification Method of Medium and Shallow Natural Gas Reservoirs
An identification method, natural gas technology, applied in the field of gas pool identification, can solve problems such as small area, small single sand body reserves, and explorers mistaking gas pools, etc.
Active Publication Date: 2015-09-09
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
Studies have shown that the previous single "bright spot" gas finding technology can only find gas for lithological sandstone. The main problem of this technology is: special lithology (lime, coal seam) and thick water sand will also form " It is easy to be mistaken for a gas reservoir by explorers; at the same time, recently, explorers have also introduced some seismic attributes (amplitude, frequency) by referring to oil-seeking techniques, and achieved certain results
At present, at home and abroad, the "bright spot" gas with small sand body area and small single sand body reserves in the middle and shallow layers has not attracted enough attention, so we have invented a new The identification method of medium and shallow natural gas reservoirs solves the above technical problems
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[0021] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.
[0022] Through the study of the natural gas accumulation model in the middle and shallow layers, it is concluded that the natural gas in the middle and shallow layers is mainly distributed in three favorable zones: the uplift zone, the fault zone and the slope zone. Such as figure 1 as shown, figure 1 It is a flow chart of the method for identifying medium-shallow natural gas reservoirs of the present invention. In step 101, amplitude-preserving processing is performed on the seismic data. The purpose of this step is to eliminate the amplitude variation caused by factors irrelevant to the reflection interface, so that the reflection amplitude after recovery processing is only related to the reflection coefficient of the reflection interface. Th...
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The invention provides a middle-shallow layer natural gas reservoir identification method which comprises of amplitude preservation for seismic data; description of the distribution pattern and the range of sand bodies by means of the seismic data undergoing the amplitude preservation; analysis of the reflected wave amplitude and the shot-geophone distance of AVO seism pre-stack trace gathering for detection of gas content performance of the described sand bodies; analysis of distribution characteristics of elastic energy and plasticity in a frequency domain for detection of the gas content performance of the described sand bodies; and reflected wave multi-parameter identification for detection of the gas content performance of the described sand bodies. The middle-shallow layer natural gas reservoir identification method resolves the problems that in the prior art, the well drilling success rate is low, single-attribute identification effects by means of seismic data are not ideal, and the like, and has the advantages of being high in well drilling success rate and wide in application.
Description
technical field [0001] The invention relates to gas pool identification technology, in particular to a method for identifying mid-shallow natural gas pools. Background technique [0002] The principle of middle and shallow natural gas reservoir identification is based on the reflection characteristics of gas reservoirs formed on seismic data, mainly through "bright spots" to find gas. In the 1980s, it achieved good application results in natural gas exploration and development. The reflection features directly provided drilling well locations, found a way for the identification of medium and shallow gas reservoirs, and guided the exploration of natural gas at that time. However, the formation of "bright spots" caused by earthquakes is controlled by many factors. The success rate of drilling for natural gas through "bright spots" is only 60-70%, and the success rate of 30-40% drilling needs to be improved. Studies have shown that the previous single "bright spot" gas findin...
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IPC IPC(8): G01V1/30
Inventor 李文涛李孝军焦婷婷韩颖陈旭辉曲长胜
Owner CHINA PETROLEUM & CHEM CORP