Evaluation Of The Chang 6 Reservoir And Research On Water Injection Development In The Western Area Of ​​Guoqi, Ordos Basin

Guoqi West is located in eastern Ordos Basin Yi Shan slope, the main reservoir extension group 6, has been developed to take natural energy mining, single well production decline faster. In order to achieve the goal of efficient development of reservoirs, it is necessary to find out the characteristics of Chang 6 reservoir in the block. Through the study of reservoir characteristics and the analysis method of reservoir engineering, a reasonable waterflooding development plan can be worked out.This paper mainly provides the important basis for the study and formulation of the waterflooding development plan by developing stratigraphic division and contrast, sedimentary system and sandbody distribution characteristic analysis as well as reservoir characteristic research, reservoir fluid property experiment, reservoir classification and evaluation and so on. The reasonable technical policies for waterflooding development are determined, including reasonable water injection timing, type of well pattern, injection pressure system, single-well distribution and other related projects, and so on. In this way, the reservoir engineering demonstration work is carried out and the formula calculation and the actual situation on site are carried out. Parameters, the preparation of the deployment plan. Finally, it is concluded that the Chang 6 reservoir in the western part of Guoqi is divided into four sublayers, mainly delta facies sedimentary subfacies and gray fine-grained feldspar sandstones, and the pore type is dominated by intergranular dissolved pores. The porosity is kept at 7.96% and the permeability is 0.55×10^-3μm². The results of reservoir classification evaluation were chang 6¹ better than chang 6², chang 6² better than chang 6³.The water recovery of Chang 6 is 18%, the development pattern is square and rhombus counter 9, the well spacing is 220m, and water injection development index predicts an increase of 1.72%. The total oil production is increased by 64.76×10⁴t, Will achieve a higher economic efficiency.The characteristics of reservoirs in this paper can provide reference for waterflooding development of the same type of oilfield.