The Shallow Investigation Of Feixianguan Group Reservoir In X Area,Sichuan Basin

This thesis study carbonate high-energy beach facies prediction，which basedon the analysis of the seismic sequence， bioherm&oovoid feef flat reservoirprediction and gas-bearing properties recognition as the main researchdirection.Around the type of carbonate reservoir in feixianguan group, the thesiscombines well logging with seismic to do reservoir prediction, at the same time itcarries out seismic sequence and reservoir prediction&gas-bearing propertiesprediction. Direct at bioherm&oovoid feef flat reservoir this thesis formed a set ofpractical and effective earthquake prediction technology. Which not only providesan important technical support To find out the beneficial of bioherm&oovoid feefflat reservoir distribution in study area,but also to find out the natural gas reservesand the follow-up exploration scale.First, the thesis analyzed sedimentary characteristics of feixianguan group whichbased on the uses of seismic sequence analysis in X area,Seismic sequencerecognition and paleogeomorphology restoration were done which based on thefeixianguan gruop thickness and lithofacies changes well knowen.it provides a goodguide for the subsequent reservoir prediction.Second, in view of the feixianguan bioherm&oovoid feef flat reservoircharacteristics and fine calibration of horizon as the foundation,the thesissummarized reservoir earthquake abnormal response mode and analysis of reservoirthickness&petrophysical parameters of seismic response of the change, thusvalidated reservoir earthquake abnormal response mode. In addition, it choosessome sensitive and clear geological significance seismic attribute to analysis andoptimization some attribute contained in post-stack seismic data, which qualitativeforecast reservoir development area. It carry out the porosity inversion, quantitativeforecast of the thickness of the reservoir, effective porosity and energy storagecoefficient by using the results of the seismic attribute and qualitative forecast as aguide. Good results have been achieved by using forward modeling analysistechnology, the seismic attribute analysis technology and phased inversion techniqueto forecast the reservoir.Then, pre-stack seismic data contained more lithology and fluid of relevant property parameter compared with post-stack data. These parameters mainly arePoisson’s ratio, gradient, intercept,，, etc. Optimizing sensitive attributesthat can reflect the reservoir properties by analysissing pre-stack seismic attribute,thus showings of the reservoir prediction.