The Advantageous Region Evaluation Chung8Formation In Ji15Well Area

This paper aims at the development of current status on low permeable reservoirs andreservoir characteirstics chang8formation in J15well area in Changing oil field，based onobservation of cores using various expeirmental methods. A comprehensive and systematicstudy focuses on sedimentary pirnciple, reservoir property and micro-pore structure alsoanalyzes the mainly controlled factors to reservoir, evaluates systematically and predicts theadvantageous region chang8formation in J15well area, considering real production situation.The main conclusions in the thesis are as follow:1、Reservoirprovenance in Chang8formations in study area are mainly from thenortheast and northwest by the two mateiral source contral.2、Deltafront parfacies is the main type of sedimentary facies in Yanchang formation instudy area.3、Themain rock type of reservoir rocks in ChangS in study area is syrosem arkose、asmall amount of feldspar lithic quartz-standstone,4、Chang8reservoir compaction of medium-strong,carbonate cemented layers arecommon in the development of small,and iron calcite、ankerite-bascd; Chang8reservoir ofclay minerals to chlorite and illite-based;Dissolution of the reservoir study area is relativelystrong,fractuirng is relatively weal.5、Reservoirformed by lithology?sedimentation and techonic common control,And thefactors affecting oil and gas accumulation of stand followed by the distribution of sedimentaryfacies，reservoir lithology and techonic.6、Chang8in study area generally contains more oil, which are good advantageousregion.