Study Of The Sedimentary Facies And Reservoir Characteristics For Shan Xi Formation In Zhao51Area In Sulige Gas Field In Ordos Basin

This thesis selects Shanxi formation as studied object, which sit in the east ofZhao51Area in Sulige gas field in Ordos Basin. Using the theory of sedimentology、petroleum geology, combined with regional geological data, cores, flakes and loggingdata, we try to study the sedimentary micro-facies and Reservoir Characteristics ofShanxi formation。The Shanxi formation in the study area can be divided into the shan1and shan2segments，On the basis of the understanding of the regional tectonic background。Through the sedimentology sign Paleontology sign and log facies sign to analysis，find that the study area of shanxi formation is given priority to with meandering riverdeposition，but In the early sedimentary（Shan23depositional stage）development ofbraided river deposits。Through the single sedimentary facies analysis and the well tiesedimentary contrast to research the plane distribution of sedimentary faciescharacteristics。The sedimentary environment change Marine facies to continental，East-west differences largely disappeared，Sand body nearly ns-trendingdistribution。Analyzes the reservoir characteristics of shanxi formation，The study area reservoirrock types of rocks dominated by lithic quartzite, lithic sandstone and quartzite；Thetypes of porosity are dissolution pores；The structure of porosity are fine pore finethroat，possess the following characteristics the Row of displacement pressure isbigger、the median pressure medium、the median radius small、the high mercurysaturation and the medium efficiency of mercury withdrawal。The types of diagenesishave compaction, cementation, metasomatism and dissolution，low porosity and lowpermeability reservoir。Reservoir property affected by sedimentary facies、 sedimentation and thediagenesis of the multiple influences。Different rock、lithology and sedimentary fabrichas obvious influence on reservoir property。The higher the content of quartz Grainand the size is coarse, the physical property is better。The Compaction and cementation are able to damage Reservoir performance，but the dissolution can makeReservoir performance better。...