哈南阿尔善油藏微裂缝特征及其对开发的影响  

CHARACTERISTICS OF MICRO-FRACTURES AND THEIR INFLUENCE ON WATERFLOODING IN AERSHAN RESERVOIR, HANAN OILFIELD

作　　者：张莉[1] 杨亚娟[1] 岳乐平[1] 苗坤[2] 宋社民[2] 张满库[2] 

机构地区：[1]西北大学地质系,陕西西安710069 [2]华北油田二连公司,内蒙锡林浩特026017

出　　处：《石油与天然气地质》2001年第2期158-160,193,共4页Oil & Gas Geology

摘　　要：哈南油田阿尔善储层发育构造微裂缝。经显微镜薄片观察，微裂缝的开度区间为１０～３０μｍ，延伸长度为 ｌ～３ ｍｍ，面积密度为每平方毫米００２５ ｍｍ。微裂缝是大裂缝的前奏，大裂缝发育区也是微裂缝发育区，微裂缝发育受控于断裂构造，与断裂及大裂缝同向，以ＮＥ向为主。经模型观察，双重孔隙介质模型的水驱油方式为裂缝－部分基质孔隙驱油。微裂缝对开发具有双重作用，一方面微裂缝可以改善基质渗流能力，另一方面微裂缝与大裂缝、断层形成断裂网络，对汪水产生不利影响。针对这一特点，在微裂缝发育区域，应采用周期性注水以期提高驱油效果。Structural fractures developed well in Aershan reservoir, Hanan Oilfield. The width of the micro-fractures is 10~ 30 pin, the length is 1 ~ 3 mm and surface density is 0.025 mm2. The micro-fracture porosity and permeability have been calculated, and the distribution is analyzed. Micro-fractures are preface of macrn-fractures and the macro-fracture developed areas are also micro-fracture developed areas. A sandstone micro-model experiment has been done to investigate the process of displacement between fractures and matrix. Based on the above studies, micro-fractures play two different roles on waterflooding. On one hand, they may improve the permeability of the reservoirs; on the other hand, the together with macro-fractures and faults may improve network, which have bad effect on waterflooding. According to the characteristics of ,micro-fractures in Aershan reservoir, some suggestions such as periodic injection are put forward to improve the effect of waterflodding in fracture-developed areas.

关 键 词：哈南油田 阿尔善油藏 储层微裂缝 注水开发 

分 类 号：TE344[石油与天然气工程—油气田开发工程]