A Favorable Facies Belt For The Sedimentary Facies Of TI Oil Formations And High-quality Reservoirs In The Teng-2 Member Of The Hanan Area

Hanan area is located at the A'nan depression in the east of Magni org in Erlian basin. This paper,taking TI oil group in Teng 2 member as the research object,aims to find out the sedimentary facies,make clear about the distribution of sedimentary facies and ascertain the favorable sedimentary facies belt of high-quality reservoir,which provides an important guiding significance for the future exploration and development in this area.The Thesis divides TI oil group,from bottom to the top, into three sand groups-lower TI sand group, middle TI sand group and upper TI sand group.Then,each sand group is correlated through the methods of analysing key bed,well logging curves, lithological association and sedimentary cycle. Correlation results show that the sand group thickness changes greatly.Source analysis,which is made by studying detrital components, shows that the sediment source mainly comes from north,south and southeast of the target zone. On the basis of source analysis, seismic facies, logging facies and rock characteristics,the paper comprehensively holds that the area of A'bei and Hanan hill belongs to a meandering river delta-lacustrine depositional system, and the area of Jihe-Hadong belongs to a braided river delta-lacustrine depositional system.Furthermore,The paper marks out three phases, four subfacies and twelve microfacies.Based on the phase analysis on single wells and connected wells, combined with sand rate and source direction, the plane characteristics of sedimentary facies of the TI sand groups are studied. Of all the microfacies in TI oil group,underwater distributary channel, sheet sand, distributary bay and shallow lake mud account for a larger proportion. The TI oil group shows it has experienced a lake invasion stage.Reservoir physical property analysis manifests that TI oil group mainly develops medium porosity and low permeability reservoirs,partly with high porosity and high permeability reservoirs. Porosity mainly concentrates between 10% and 25% with its average 19.31%.Permeability mainly concentrates between 0.1mD and 100mD with its average 56.4mD.they showed good positive correlation.The paper divides the reservoir into four types: ?,?,? and ?.The three river sedimentary facies are the most Favorable sedimentary facies belt for good reservoirs(I and II).Finally,the paper has analysed the areas in which high-quality reserviors lie.