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西峰长8油藏受岩性变化的影响比较大,定义其为岩性油藏,主力油层深度在1700~2220m之间,砂体的厚度在10~30m之间,储层的平均有效厚度为12.3m,属特低产、低渗、特低采油指数、特低丰度、中深层的大型岩性致密油藏。由于堵塞作用容易在储层内形成,所以从投入以来至今,加之开发程度的不断深入,有些注水井的注水压力呈现出上升的趋势,个别井口由于高压的影响注水难度加大或注不进水,从而出现对应的油井产液量出现下降。
The reservoir of Xifeng Chang 8 is greatly affected by the change of lithology. It is defined as a lithologic oil reservoir. The main reservoir depth is between 1700 m and 2220 m. The thickness of the sand body is between 10 m and 30 m. The average effective thickness of the reservoir is 12.3m, which belongs to a large-scale lithologic tight oil reservoir of extraordinarily low production, low permeability, extra low oil production index, extraordinarily low abundance, medium and deep layers. Since the plugging effect is easy to be formed in the reservoir, so since the start of investment, combined with the deepening of the development, the injection pressure of some water injection wells shows an upward trend. As a result, it is more difficult or impossible for individual wellheads to inject water due to the influence of high pressure , Resulting in the corresponding decline in oil production wells.