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In this paper, sedimentology, petroleum geology of theoretical guidance, combined with seismic , drilling ( test ) wells, test and analysis of core samples and other related information , on the basis of previous studies on Al Sag , Erlian Basin Mesozoic sedimentary facies and reservoir characteristics are analyzed, and on this basis, the region and favorable reservoir zones for prediction. Integrated use of logging data and drilling data on work area to make structural interpretation of seismic data ; complete Mesozoic stratigraphic distribution, determine Al depression Mesozoic tectonic features . Landmark software through the use of 3D seismic data interpretation , and further understanding of work area structure, sequence evolution . By lithology, sedimentary structures , the main facies types and other characteristics, the Mesozoic sedimentary facies are divided into three types , mainly for the fan delta , followed by alluvial and lacustrine facies , and on this basis, further divided by 5 sedimentary facies and seven sedimentary facies . On three core observation wells and description , to make a single well sedimentary facies analysis ; divided according to sedimentary facies sedimentary facies types and in profile , plane distribution, make sedimentary facies model diagram . Core observation , thin section analysis and other means to discover Al depression Mesozoic reservoirs mainly through compaction, cementation , dissolution , etc. diagenesis, diagenetic stage is divided into early diagenetic stage B . For reservoir evaluation , reservoir prediction made ??, combining work area to predict the structural trap oil and gas prospects . Cretaceous reservoir area is mainly Tenggeer , mainly conglomerate deposition, rounded moderate , sub- checked , etc., moderate overall maturity structure , compositional maturity medium . Sandstone is mainly secondary porosity reservoir heterogeneity of the paragraph stronger overall a low porosity and low permeability and low porosity and low permeability reservoirs special . Properties in general, more stable lateral distribution , reservoir cap configuration is better, there is oil and gas shows , comprehensive evaluation for medium reservoir . Finally, sedimentary facies and reservoir characteristics found favorable zone for the depression of central and eastern Mesozoic buried hill trap development area, with a complex structure and lithologic reservoirs developed zone .
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