陕北斜坡东部上古生界现今应力场特征  

Present stress field characteristics of Upper Paleozoic in the east of North Shaanxi Slop

作　　者：王永炜[1,2] 万永平 归榕 张仙伟[1] 

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]陕西延长石油(集团)有限责任公司研究院,陕西西安710075

出　　处：《西安石油大学学报（自然科学版）》2014年第1期15-20,4,共6页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家科技支撑计划项目(编号:2007BAB17B00);陕西省教育厅科技项目(编号:12JK0065)

摘　　要：在计算垂向主应力的基础上，采用Newberry水平主应力模型及Haimson地层破裂压力孔隙弹性模型，计算了陕北斜坡东部上古生界现今主应力大小，采用构造模拟方法研究水平主应力方向，进而完成陕北斜坡东部上古生界现今应力场特征研究。结果表明：研究区最小水平主应力主要在30—36MPa之间，最大水平主应力主要在40～55MPa；水平主压应力方向NE37°-85°，北部主要为NE37°-75°，南部主要为NE75°-85°。根据研究区现今应力场研究结果，该区井网部署过程中应适当增加NE及NEE方向井距以扩大井网控制范围，在储层压裂改造过程中施工压裂应大于40MPa，以达到破裂造缝的目的。Based on the calculating vertical principal stress,the present horizontal principal stresses of the upper Paleozoic in the studied area are calculated using Newberry horizontal principal stress model and Haimson formation breaking pressure model,and the present stress field characteristics of Upper Paleozoic in the studied area are studied. The results show that the minimum and the maximum horizontal principal stresses are mainly in 30 ~ 36 MPa and 40 ~ 55 MPa respectively,the direction of the maximum horizontal principal stress is in NE 37° ~ 85°,in the north of the studied area it is mainly in NE 37° ~ 75°,and in the south of the studied area it is mainly in NE 75° ~ 85°. According to the research results,the well spacing in the area should be increased in NE and NEE directions to increase the control range of the well pattern,and the fracturing pressure should be greater than 40 MPa in the reservoir fracturing construction.

关 键 词：陕北斜坡 上古生界 现今应力场 

分 类 号：TE122.2[石油与天然气工程—油气勘探]