The Reservoir Evolution And Favorable Area Screening Of Chang 6 Reservoir In South Tan Jiaying

Tan Jiaying area is structural reservoir,through continuous improvement injection-production patterns and rationalize the injection-production relation,in order to maintain a good development situation.But in the initial production of oilfield,the production well with higher moisture content,low fluid production,decreasing fast,part well with low degree of water drive,a large proportion of low-yielding wells,some fast rising water cut wells,much more water flooded well and other problems.In order to further improve the formation energy and maintain the well productivity,improve the development effectiveness,deepen understanding of the region's geology,as well as to provide a reasonable program to develop technology policy and implementation plan to adjust the boundaries.According to the widely developing key bed in study area and combining with references of well drilling,logging and outcrop,methods of layer uniform thickness,sedimentary cycle and contrast of adjacent well were used to divide chang 6 into 6 small layer chang-6,,chang-62,chang-63 and chang-64 through contrasting large section first and single layer then.Next,chang-61 oil-rich layer was divided in to two sub-layers as chang-61-1 and chang-61-2,in addition,chang-62 was divided in details into chang-62-2 and chang-62-2 sub-layers.The stady area Chang-6 is located in delta front,and the mainly three sedimentary micro-facies are underwater distributary channel,split bay and the river flank.The main river is northeast-southwest spread,and the sand is distributed banding.Segment of Chang 6 reservoir lithology is mainly fine-grained feldspathic sandstone,better separation,the psephicity roundness of ribbed,mostly line contact.The cement is the most interstitial material in the study area,the main pore types are dissolution intergranular pore then primary intergranular and intragranular dissolved pore.The study area have been experienced diagenesis which are include compaction,pressure solution,cementation,metasomatism,dissolution and so on.In particularly,compaction,greater pressure solution,cementation and dissolution have most effects on reservoir properties.Chang 6 of the study area have strong heterogeneity.Through secondary logs interpretation,combined with reservoir physical property,microscopic pore structure characteristics,sedimentary facies and other factors,the Chang 6 reservoir divided into Class ?,?,and class ? reservoir,and on the basis of these three reservoirs on the study area to screening favorable area.