陕甘宁盆地川口油田低渗透油藏长6油层裂缝特征

张莉; 杨亚娟; 张玉玲; 赵阳; 孟志学; 严云奎; 岳乐平

陕甘宁盆地川口油田低渗透油藏长6油层裂缝特征

1.
西北大学地质系, 陕西西安 710069

2.
大庆石油管理局, 黑龙江大庆 163110

3.
延长油矿管理局, 陕西延长 717100

基金项目: 延长油矿“川口油田裂缝研究”项目

收稿日期: 2001-03-30

修回日期: 2002-04-15

刊出日期: 2002-06-15

Characteristics of fractures of Chang-6 low-permeability reservoir in Chuankou oil field，Shan-Gan-Ning basin

1.
Geology Department, Northwest University, Xi'an 710069, China

2.
Daqing Petroleum Administration, Daqing 163110, Chaina

3.
Yanchang Oilfiel Administration, Yanchang 717100, China

Received Date: 30 March 2001

Revised Date: 15 April 2002

Publish Date: 15 June 2002

摘要

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.
- 川口油田 /
- 长6油层 /
- 裂缝特征 /
- 压裂和注水开发
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.
- Chuankou oil field /
- Chang-6¹ reservoir /
- characteristics of fractures /
- fracturing and waterflooding