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The Study Of Seismic Prediction For Oolitic Reservoir Of The 3rd Member Of Feixianguan Formation In HCL Region In Northeast Of Sichuan

Posted on:2010-10-10Degree:MasterType:Thesis
Country:ChinaCandidate:Y HuangFull Text:PDF
GTID:2120360278460641Subject:Earth Exploration and Information Technology
Abstract/Summary:PDF Full Text Request
Marine carbonate regions in south of China are important areas for oil and gas exploration. In recent years, with further oil and gas exploration work, the natural gas field with the largest reserves- Puguang large field was found that in the northeast of Sichuan. The main layer of Puguang field was Feixianguan group, and its favorable facies was the platform marginal shoal, which indicates that the Feixianguan group in the northeast of Sichuan has a good exploration prospects and Tongnanba tectonic belt belong to the northeast of Sichuan develops the Feixianguan Formation oolitic reservoir too. The study area of this paper–HCL exploration area is located in the eastern part of Tongnanba exploration area in Northeast of Sichuan, and oolitic reservoir develops in this area. But it is difficult to carry out more accurate predictions for this kind of reservoir by a single type of geophysical methods because that the oil and gas exploration level in HCL area is less and the study of sedimentary facies and reservoir is not in depth enough, but also carbonate reservoir itself has a strong heterogeneity.This paper taking the oolitic reservoir of the 3rd Member of Feixianguan Group in Lower Triassic in HCL area as the main study object, based on full collections and analyses of the geological, seismic, drilling, logging and testing well data in the work area, made horizon calibration and contrast for intended formation, and using neural network seismic waveform classification technology, seismic attribute analysis techniques, impedance inversion technology and the absorpti??ttenuation analysis technology, forecasted the distribution of oolitic reservoir, at the same time, probed favorable oil and gas areas of oolitic reservoir, and ultimately proposed seismic prediction process suitable for oolitic reservoir. First of all, for the seismic response characteristics of the oolitic reservoir–middle-low frequency, non-cluttered and middle-weak continuity and middle-strong reflection, use the forward modeling, attribute analysis, waveform classification methods to obtain the seismic facies division and find possible oolitic development region. Then, in the predicted oolitic reservoir development areas , use wave impedance inversion and absorption attenuation analysis technology to analyze the oolitic reservoir fluid, further enable the distribution of oolitic reservoir area. Finally, integrate geological, drilling, seismic and other information, by PCA principal component analysis method the study area to abtain the integrated oolitic reservoir prediction.By the above analysis, this article has made the following major achievements and understanding: in the aspect of methods and technology,①proposed the MIVMAS forward method to simulate the seismic response characteristics of oolitic reservoir, and the numerical simulation of the study area showed that the oolitic reservoir had "bright spot" reflection characteristics;②for the seismic response characteristics of oolitic reservoir, "middle-low frequency, non-cluttered and middle- weak continuity, strong reflection," proposed a forecast flow suitable for oolitic reservoir;③using the " low-frequency shadow" technology based on the high-precision time-frequency analysis, taking advantage of the low-frequency seismic signal information can be used to effectively predict the development of oil and gas area;④for the special development area of oolitic reservoir, the waveform classification based on self-organizing neural network can better achieve the division of the seismic- geological sedimentary facies. In the aspect of geo??cal results,①by the seismic facies analysis based on waveform classification, classified the sedimentary facies of the 3rd Member of Feixianguan Group of the study area;②by the integrated prediction of a variety of methods, forecasted a favorable band of oolitic reservoir development area and carved out a favorable area (located at a relatively high structural position) and a less favorable area (in the relatively low structural position).All the analysis indicated that the above methods can better predict the distribution of oolitic reservoir and the favorable distribution area of reservoir, and can provide evidence for the deployment of drilling.
Keywords/Search Tags:Oolitic Reservoir, Seismic Attribute Analysis, Impedance Inversion, Absorption Attenuation, Seismic Prediction
PDF Full Text Request
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