Reservoir Seismic Prediction In The Sequence Stratigraphic

Seismic interpretation and reservoir prediction technique is an important meansfor exploration of oil and gas reservoir of the advanced application solutions, butseismic data to seismic reservoir prediction technology challenges. The sequencestratigraphy theory provides the ideas and methods of analysis for the exploration anddevelopment of oil and gas, this paper is based on sedimentology, sequencestratigraphy theory, aims to combine seismic exploration and the structure, sequenceevolution and sedimentary model, form the comprehensive analysis method ofgeological, seismic integration.Based on the sedimentology, seismic stratigraphy, sequence stratigraphy, physicsof the earth as the theoretical basis, characteristics of sedimentary systems in theWestern Sichuan depression three Triassic Xujiahe formation, sequence stratigraphy,space-time material sources in the region of three sedimentary of conversion arestudied, based on the analysis of the sedimentary characteristics differences Longmenmountain uplift and Western Sichuan Xujiahe group, on the basis of this, with highresolution3D seismic data, application of seismic sedimentology theory, in view ofthe Western Sichuan Depression Xujiahe tight sandstone gas reservoir, the geologicalcomprehensive earthquake prediction method, the geological model andunderstanding of macro guidance and restraint, adaptation of seismic reservoir inWestern Sichuan Xujiahe Group delta prediction method. The main ideas are asfollows:1, the sedimentary system of comprehensive division of West Sichuan depressionthree Triassic Xujiahe, think that there are3depositional systems tracts,7types ofsedimentary systems, respectively is the system of mainland group: including alluvialfan sedimentary system, fluvial system, lacustrine depositional system, lacustrinedelta sedimentary system of sea and land; the transition system: mainly deltadepositional system; the ocean system: the main barrier coast depositional system,carbonate platform depositional system.2, by using the method of outcrop, logging, seismic sequence stratigraphy,genetic type in Western Sichuan depression three Triassic sequence interface, the interface is studied, the layer sequence interface identified3genetic types,6kinds ofmaterial manifestation. On this basis, the system established in the West Sichuandepression three Triassic sequence division scheme, that the Western Sichuandepression three Triassic3tectonic sequence,6three level sequence.3, using sandstone cutting characteristics, heavy mineral analysis, andcathodoluminescence various methods, combined with the seismic interpretation ofWestern Sichuan depression, Xujiahe formation of provenance analysis.4, to construct the sequence system tract as the research unit, using the researchresults of provenance analysis, analysis of the long control differences and of WesternSichuan Depression sediment sequence filling up north, middle, south of the evolutionof the structure of the Longmen orogenic belt. Based on studying the characteristicsand sequence stratigraphy sedimentary facies types, regional sedimentary facies ofLate Triassic system was designed in three Western Sichuan depression of the mainsequence, reveals the palaeogeographic pattern, the area development characteristicsand its evolution.5, in order to seismic sedimentology theory as the main research method, in theanalysis of the Western Sichuan Depression Xinchang area shall be based on fourperiod of relative high quality reservoir development controlling factors, through thestudy of frequency division interpretation technology contrast tracking small level ofearthquakes and other interface, using mixed phase sub drilling control wavedeconvolution technique to ensure a reasonable signal-to-noise ratio, effectivelyimprove the seismic resolution, the geological information of seismic reflection. TheWestern Sichuan Basin T3x4（9）sand groups. The study of sedimentary microfacies,T3x4（9）sand group sand bodies developed widely, underwater distributary channelmigration change constantly, the sand body superimposed each other, to judgeaccording to the extension direction of sand body, source of the northern Longmenmountain for the study area the island chain, wherein the Xinchang area central due tomultiphase subaqueous distributary channel superimposed, thickness of sand body, isthe favorable exploration of the region.6, through comparative analysis, found the wavelet decomposition technique,coherence analysis is in Western Sichuan Basin, characterizations of T3x4（9）anddevelopment of effective means of fractures sand belt, wherein the crack growth areais area with favorable overlap area of West Sichuan Depression Xujiahe gas reservoiris the favorable exploration region.