Reservoir Evaluation Of The Tengger Formation In Anan Sag

The Anan Sag is located in the north-east of the Manite depression of Erlian Basin with a slow anticline.In the whole SAG,the accumulated proven oil reserves are 9694x104 t,the remaining resources are 1.36x108 t,and there are many unused blocks in the area,the area has great potential for exploration,evaluation and development,and the group is one of the target layers of exploration and development.Based on the reservoir sedimentology and modern sedimentology,in the key areas and in the key sedimentary systems,by using the existing exploratory well and development wells to carry out sedimentary microfacies research,and then study the reservoir characteristics and effective reservoir distribution,the results show that the porosity of the reservoir in the Beier formation in Anan Sag is mainly in the middle pore,and the permeability of reservoir is mainly ultra-low permeability,And the middle permeable reservoir is developed.Using the core observation,by means of physical analysis and slice identification,combined with logging data and logging data,this paper systematically studies the reservoir characteristics of the Beier formation in Anan Sag,describes the various factors that control the reservoir,and finally makes a comprehensive evaluation of the reservoir with the above research.Based on the reservoir sedimentology and modern sedimentology,in the key areas and in the key sedimentary systems,by using the existing exploratory well and development wells to carry out sedimentary microfacies research,and then study the reservoir characteristics and effective reservoir distribution,the results show that the porosity of the reservoir in the Beier formation in Anan Sag is mainly in the middle pore,and the permeability of reservoir is mainly ultra-low permeability,And the middle permeable reservoir is developed.The reservoir of the group in the study area is in the late diagenetic stage A.The main pore types of reservoir in the study area are six kinds of intergranular dissolution pore,feldspar solution,cuttings dissolving hole,primary intergranular pore,mould hole,micro fissure and so on,among which the pores of intergranular dissolution are most developed.laryngeal tract development has contraction throat,flaky throat and micro-throat,and micro-throat and flaky throat mainly.The combination of pore and throat is mainly based on the core observation,by means of physical analysis and slice identification,combined with logging data and logging data,this paper systematically studies the reservoir characteristics of the Beier formation in Anan Sag,describes the various factors that control the reservoir,and finally makes a comprehensive evaluation of the reservoir with the above research.In this area,the sedimentary facies of the group were mainly lacustrine,and braided River delta and fan Delta Facies were developed.The mat sand of braided River Delta Front is the main reservoir sand body,its production capacity is highest,the side edge and beach sand of fan delta front mat sand and fan Delta front water distributary channel have certain capacity,and the production capacity of the subaqueous distributary Channel micro phase in fan Delta Front is lower.In the IV reservoir of the 84.65%;II formation in Anan sag,there are only 2.89% reservoirs in the reservoir of 6.68%,III formation in Anan sag,which occupy the strata of the reservoir in the stratum of 5.78%,I formation in Anan sag.