Raoyang Depression Renqiu Fault Sand Es2、Es3Paragraphs Of Tight Sandstone Reservoir Characteristics

The compact clastic rock gas reservoir has taken a very important position in theworld’s natural gas resource.According to estimate the world’s unconventional gas isalmost at the unsxplotive stage. Of tight sandstone reservoirs rich in natural resources, itproved reserves and technology, the tight sands exploration and development has importantpractical significance. Tight sandstone gas has become an important force in the natural gassupply has been, and will become an important reserve and production growth component.Since the presence of tight reservoirs small porosity log response relationship complicated,low permeability, low gas saturation complex problems, make for tight sandstone gasreservoir evaluation layer caused a series of challenges.Proper evaluation can contribute to the implementation of reservoir exploration resultsand scientific guidance to the development of oil and gas fields, therefore, to carry outresearch for tight sandstone reservoir is necessary and urgent, dense low permeabilitysandstone reservoir exploration for the sustainable development of China’s petroleumindustry has strategic importance, for it must have a full understanding.In this paper, Raoyang Depression Renqiu fault Shahejie two, three sections for thestudy, Renqiu fault Shahejie strata more complete, complete Shahejie can be divided intoEs1, Es2, Es3, Es4, through the core observation, identification and sample test sheet andother research, the use of petrological characteristics and logging phase analysis method, onthe basis of previous studies and a lot of testing on the basis of Shahejie tight sandstonereservoir facies rocks characteristics were analyzed and found mainly developed areaShahejie river-floodplain-(braided) delta-Lake depositional system can be furtherdivided into the delta plain, delta front and shallow lake three categories subphase, brokendown into distributary channel, flood plain, delta plain, delta front, shore, shallow lakes andsemi-deep lake. Reservoir as a set of relatively low compositional maturity structure of highmaturity clastic rocks, low compositional maturity and low levels of performance in aquartz feldspar, lithic content is higher, compositional maturity index (quartz/feldspar+lithic) averaged1.21; higher maturity structure shown in detrital sorting, rounded better,less complex group content. Study area Shahejie reservoir sandstone type feldspathic lithicsandstone and lithic feldspathic sandstone; Shahejie most sandstones are fine, very finesand grade range, respectively, representing47.3%of statistics and33.5%. Diagenesis strong in this area, reducing porosity diagenesis mainly compaction andcementation, increasing porosity diagenesis denudation and tectonic disruption. Coreobservation and thin section analysis, we can see the evolution of this area a higher degreeof diagenetic stage, overall in the B subunit of diagenetic stage. Mainly secondary porositypore types, including intergranular dissolved pores and intergranular pore, rare residualprimary porosity. Portfolio of fine pore pore pore throat and larynx based micro-pore throatstructure overall is poor. Overall the study area is poor reservoir properties, loggingphysical analysis of local development is relatively high porosity and permeabilityreservoirs, but overall has Shahejie Formation densification reservoir for the special lowporosity and low permeability reservoir.Deposition and diagenesis Renqiu fault affecting a major factor in tight reservoirdevelopment. Sedimentary facies (facies) with controlled macroscopic reservoir sand bodydistribution, effect on the reservoir rock types essence reservoir characteristics andstructural components of the impact of these characteristics determine rock post rock typeand diagenesis strength. Studies suggest that distributary channel and underwaterdistributary channel microfacies quality reservoir formation in this area is the mostfavorable regions, the environment formed by deposition of coarse sand grain size, wellsorted, structure, maturity and mineral high maturity during diagenesis, the compressivereal ability, is conducive to primary intergranular porosity preservation. Diagenesis affectsnot only the evolution of reservoir pore space and pore throat structure, and ultimatelydecided the quality of reservoir properties and reservoir distribution. Diagenetic reservoirproperties that affect the most important factor, in which carbonate cementation andcompaction densification greatest impact on the reservoir.