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Relationship Between Reservoir Characteristics And Gas Enrichment Of Benxi Formation In The South Of YanChang

Posted on:2011-11-03Degree:MasterType:Thesis
Country:ChinaCandidate:X Y QinFull Text:PDF
GTID:2120360305966963Subject:Mineralogy, petrology, ore deposits
Abstract/Summary:PDF Full Text Request
Benxi formation is an important gas reservoir in the south of YanChang.Research on the relationship between reservoir characteristics and gas enrichmenthas great significance for the future exploration.Based on the research and study of predecessors, used sedimentology,reservoir geology, natural gas geology, petroleum entrapment geology and logging geology as the instruction. Collection of 54 wells using geological logging, logging data, core analysis, analyzing thin section, scanning electron microscopy, mercury and other information,to study the sedimentary characteristics, diagenesis, reservoir physical property, microscopic pore structure, heterogeneity and other aspects comprehensive of Benxi formation, and classification of reservoir. Futher more, controls of reservoir is analyzed. And investigate the relationship of reservoir characteristics and gas enrichment.Benxi formation belongs to barrier island-tidal flat sedimentology system of terrigenous clasts coast. Reservoir sedimentary facies is mainly barrier island sedimentary. Reservoir lithology is mainly quartz sandstone. Mechanical-chemical compaction, cementation play disruptive effects on porosities development, dissolution plays a constructive role on it. Reservoir is low-super low porosity and low-low permeability.There are interparticle hole, outer hole and dissolution hole.The relationship of porosity and permeability is positive,which indicates that porosity development control the permeability. Reservoir property and heterogeneity indicate strong difference in vertical and plane, because of tectonic movement and diagenesis environment. The research above suggest that the factors control reservoir are sedimentary facies, diagenesis and tectonics. Therefore, the thickness of reservoir sedimentation has great determines on the physical properties and gas reservoir capacity, the future exploration mainly towards big barrier islands.
Keywords/Search Tags:South of YanChang, Upper Paleozoic, Benxi formation, Barrier island, Reservoir characteristics
PDF Full Text Request
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