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Seismic Comprehensive Prediction for the Oolitic Carbonate Reservoir

Author: ChengGangJian
Tutor: TangXiangRong；HeZhenHua；WenXiaoTao
School: Chengdu University of Technology
Course: Earth Exploration and Information Technology
Keywords: Oolitic beach reservoir Seismic attribute analysis Acoustic impedance inversion AVO attribute Stack elastic parameter inversion Fluid identification
CLC: P618.13
Type: Master's thesis
Year: 2011
Downloads: 45
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Abstract


Oil and gas exploration and practice shows, carbonate oolitic beach reservoir is a very important oil and gas reservoir. In recent years, the northeastern part of the Sichuan Basin Feixianguan group a series of large, extra large oolitic gas reservoirs discovery, Table MingChuan northeastern region Feixianguan oolitic beach reservoir has tremendous exploration potential and good exploration prospects. However, due to the strong heterogeneity of oolitic beach reservoir, reservoir development is controlled by many factors, coupled with the deep, deep low frequency seismic data, seismic resolution limit, oolitic beach reservoir prediction and fluid identification difficulty large. In this thesis, in order to the Feixianguan Formation oolitic beach reservoir Triassic in northeastern Sichuan CL for the study on the basis of full investigation of the geology of the area, drilling, logging, testing, seismic data, Feixianguan oolitic beach reservoir geological deposition characteristics, logging and seismic response characteristics, the formation of a series of reservoir prediction and fluid identification technology oolitic beach reservoir: seismic attribute analysis, impedance inversion, three-dimensional can visual palaeogeomorphology recovery, pre-stack elastic parameter inversion, AVO attribute analysis, fluid identification factor and dual parameter intersection analysis of reservoir prediction technology, and the area oolitic reservoir distribution and favorable hydrocarbon zone prediction. The main research content and key results are as follows: ① seen by the analysis of the geological deposition characteristics Feixianguan oolitic beach reservoirs are developed in the platform margin uplift zone application palaeogeomorphology recovery technology, carved late Permian Changxing the group palaeogeomorphology identify deposition highs that may be oolitic beach reservoir is developed regions; (2) through the statistical analysis of the logging data has been the oolitic reservoir logging response characteristics: low-speed, low-density low natural gamma, low aspect wave velocity ratio, low Poisson's ratio σ; ③ through the analysis of the seismic reflection configuration, oolitic beach reservoir performance in low frequency, the clutter in weak continuity, strong reflection amplitude \reflection characteristics; ④ oolitic reservoir logging, seismic reflection characteristics, proposed oolitic beach reservoir prediction process applies to, and through multi-attribute analysis of the seismic wave impedance inversion method poststack forecast, awareness sets direction to the the Feixianguan Formation oolitic beach reservoir by the platform margin with a reservoir toward gradual change up and down two sets of reservoirs, and has weakened Pilgrimage amplitude (the reservoir variation) of trends and predicted favorable development with Feixianguan oolitic beach reservoir: ⑤ the dual parameter logging intersection through multi-parameter analysis, can significantly distinguish gas and dry layer, water layer with a dry layer, but the gas and the water layer boundaries is not obvious, there is some overlap, which best distinguish the effect of longitudinal waves with high sensitivity fluid identification factor (HSFIF) rendezvous; ⑥ prestack elastic parameters inversion, AVO attribute analysis of a variety of methods of application of the two-parameter rendezvous analysis , the oolitic reservoir containing gas range and the thickness of the gas-bearing time prediction. In summary, the use of these methods can be better predicted oolitic beach reservoir favorable distribution area containing a fluid situation, provide more reliable evidence for the subsequent deployment of drilling, to reduce the risk of drilling.

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