阿北安山岩油藏裂缝发育特征对开发的影响

阿北安山岩油藏位于二连盆地阿南凹陷阿尔善构造带中部，是具有双重介质特征的特殊岩性油藏，该油藏1989年6月全面投入开发，初期弹性开采，1990年8月开始边，底部注水开发，1991年进行内部和边，底部相结合的注水开发，注水开发后，部分油井受效较快，产量回升幅度大，但随之含水上升快，产量下降严重，也有部分油井投产初期产量主，但压力下降快，注水不受效，注水开发于1992年产量达到最高峰，1993年初就开始快速递减。

The effect of growth fracture of Abei Andesite reservoir on oilfield development

Abei Andesite reservoir is located in the central Arshan structure of Anan depression, Erlian basin. Its reservoir rocks are of fracture-porous type which are superimposed by many sets of andesitic strata (rock flowage or karst deposits). The fractures (specially secondary fractures ) are the main seepage path; effective reservoirs are mainly located in the top of Andesite strata with growth fractures. The production of Abei Andesite reservoir declines quickly after water injection. The effect of the fracture on oilfield development is mainly characterized by: (1) At early stage of development, the thicker the fractured zone is, the better developed the fracture is, the higher the production of single well will be; (2) At water injection stage, these high and stable production wells are mainly near the faults or in the high position of the structure; (3) Because of the difference of their fracture development, the pattern of the increase of water cut of oil production wells during water flooding can be divided into 4 types: inefficient water flooding, effective for microfractures, water flooding in fractures and early water-flooded. In the early field life, wells that are located in the area where the fractures are developed have good response in the fracture treatment; while the wells with low pressure and low production have no good response after water flooding in the fracture treatment and have no response with zonal injection, zonal recovery and water plugging, but they have good results from cyclic water flooding combined with chemical profile modification agent. The research on the distribution and the growth law of fractures as well as their effects on oilfield development will be able to provide scientific basis for producing the crude oil remaining in microfractures between big fractures in the medium and the late phases of water flooding development.