A Study On Ansai Eastern Chang6Reservior Sandstone Built Production Potential

Reservoir sandstone of Chang6in Ansai Oilfield has obtained the enormous benefits ofexploration and development. In recent years, with the acceleration of development of AnsaiOilfield, the eastern part of the poor development lever of Chang6reservoir also have newdiscovery.this paper takes the eastern part of Ansai Oilfield Chang6shallow reservoir sandstone asthe research object, by consulting a large number of data, field outcrop observation, in a cleararea on the basis of the sedimentation, tectonic setting, fine stratigraphic classification andcorrelation, skeleton section, has realized the unification of small layer division; Through thecombination of heavy mineral analysis found that research direction is from the northeast areasource; Through the analysis of sedimentary facies marks found that sedimentary microfaciesare the delta front underwater distributary channel, mouth bar, distributary bay, natural leveemultiphase vertical and horizontal cut to fold, it is the favorable reservoir conditions forhydrocarbon accumulation; The casting thin sections and image using rock pore, scanningelectron microscopy, mercury injection, energy spectrum analysis and electron probe analysis,found that although the reservoir is low porosity, low permeability, high maturity structure,uniform separation, thus the reservoir is better; Finally has built12areas favorable forproduction, covers an area of145km2, prediction can be built100000tons of production scale,and gets the reliable validation according to field practices.