陕甘宁盆地川口油田低渗透油藏长6油层裂缝特征
Characteristics of fractures of Chang-6 low-permeability reservoir in Chuankou oil field，Shan-Gan-Ning basin
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摘要: 通过对野外露头观测、岩心观察、薄片鉴定、地层倾角测井解释等方法,对川口油田长6油层裂缝进行了研究.川口油田长6油层主导裂缝方向为近EW向,天然显裂缝规模小且不发育,裂缝在原始地层条件下多为闭合状态,只有在人工激发后才会表现出明显的裂缝特征.川口油田储层类型为孔隙型储集层.该区油层埋深500～700m,垂向应力为最小主应力,压裂后理论上应产生水平缝,但受到天然垂直(闭合)缝的影响,在裂缝发育区可能会形成垂直压裂缝.在目前注水条件下,注水实验区储层裂缝的作用还未表现出来.Abstract: Fractu res of Chang 26 reservoir in Chuankou oil field are studied by use of the data of theoutcrop, cores, slices and the dip log. Main fractures, extending a long the direction of near EW, are small in size and poor-developed. Most fractures are closed underg round and will show the characteristics of open fractures by a rtificial excitation. So Chang-61. belongs to porosity reservoir . Chang-61 reservoir is 500～700m in depth. The minimum stress is vertical, and theoretically the hydraulic fracture should be horizontal. However, in fracture-developed areas, the hydraulic fractures may be vertical for the effect of natural fractures. Fractures have not shown the effect on the waterflooding by now.
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