Oil gas absorption and analysis predicting method based on self-adaptation time window
A technology of absorption analysis and prediction method, applied in seismic signal processing and other directions, can solve problems such as application effect restriction, achieve better effect, obvious oil and gas prediction effect, and reduce the multi-solution of oil and gas prediction.
Active Publication Date: 2013-07-10
CHINA NAT OFFSHORE OIL CORP +1
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The above-mentioned absorption analysis techniques and related commercial application software are all realized based on fixed time window lengths. In practical applications, these techniques are only applicable to the third type of strong-amplitude “bright spot” reservoirs (Zhang Yiming, Li Xuxuan, Fu Liyun. Instantaneous wavelet The application of absorption analysis technology—taking China offshore natural gas detection as an example. Petroleum Geophysical Prospecting, 2009,48(4):368-376), and for medium-intensity oil-gas reservoirs or weak-amplitude oil-gas reservoirs, these methods have strong The multiple solutions, its application effect is subject to certain constraints
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[0038] It can be seen from the above technical solutions that the core content of the present invention has three points: adaptive time window technology, generalized S-transform time-frequency analysis technology and instantaneous wavelet absorption analysis technology. The specific implementation principles are as follows:
[0039] 1. Adaptive time window technology
[0040] Since the limit resolution of seismic data is determined by the semi-instantaneous wavelength of each time sampling point, the length of the selected time window should be greater than or equal to the limit resolution when performing absorption analysis. Conventional absorption analysis technology uses a fixed time window length to analyze the absorption point by point of each seismic record with a time window step length. However, because oil and gas formations usually show low-frequency seismic reflection characteristics in seismic records, their instantaneous wavelengths are relatively large. Therefore, th...
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The invention relates to an oil gas absorption and analysis predicting method based on a self-adaptation time window. The method is based on the low frequency seismic reflection feature of oil gas, utilizes instantaneous frequency to gain the self-adaptation time window of a target layer, and combines generalized S transformation and transient wavelet absorption analysis technology to conduct oil gas prediction. The method comprises the steps of selecting the target layer to conduct spectral analysis, confirming technology parameters adopted by an absorption analysis method, calculating the self-adaptation time window, and conducting the generalized S transformation temporal frequency analysis on the selected target layer path by path; utilizing the transient wavelet absorption analysis oil gas prediction technology to calculate the fluid attenuation factor Qf and the gas attenuation factor Qg of the target layer; finally, removing background absorption, and utilizing well absorption abnormal value of a known well oil gas layer to demarcate the section of the gained Qf and the section of the gained Qg so as to quantificationally predict potential oil gas. Compared with fixed time window technology, the oil gas absorption and analysis predicting method can more sufficiently reflect the absorption feature of the oil gas, reduces oil gas prediction multiplicity of solutions, and is more remarkable in oil gas prediction effect for medium amplitude type oil gas reservoirs and weak amplitude type oil gas reservoirs.
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Technical field [0001] The invention relates to an oil and gas prediction method using formation absorption characteristics for analysis, in particular to an oil and gas prediction method for absorption analysis based on an adaptive time window. Background technique [0002] From the perspective of rock physics, absorption, like speed and density, characterizes the basic physical properties of rocks. The development and application of geophysical oil and gas prediction technology show that formation absorption characteristics are one of the effective indicators for identifying reservoirs and oil and gas reservoirs. The oil and gas prediction technology based on the analysis of formation absorption characteristics can use seismic information for oil and gas prediction with few or no wells. Compared with other oil and gas prediction technologies, it has its own unique technical advantages, such as natural gas prediction technology in the Yinggehai Basin and natural gas in the Qiong...
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IPC IPC(8): G01V1/30
Inventor 张显文李维新姚振兴赵伟李绪宣胡光义范廷恩桑淑云朱振宇王建花印海燕王清振
Owner CHINA NAT OFFSHORE OIL CORP