大庆石油地质与开发

2016, v.35;No.177(05) 48-52

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徐家围子断陷沙河子组现今地应力方向及展布
DIRECTIONS AND SPREAD OF THE CURRENT TERRESTRIAL STRESS FOR SHAHEZI FORMATION IN XUJIAWEIZI FAULT DEPRESSION

杨亮
YANG Liang

摘要(Abstract):

徐家围子断陷沙河子组是松辽盆地致密气勘探的重点层位之一,气藏发现、水平井钻探越来越依赖于地应力的认识。通过井壁崩落法和诱导裂缝法,确定徐家围子断陷沙河子组最大主应力方向为近WE向。根据全区单井纵横波速度计算动态弹性参数,基于Newberry模型,计算徐家围子断陷沙河子组现今主应力,沙河子组最大水平主应力为85~93 MPa,最小水平主应力为69~77 MPa。结果表明,研究区水平井部署轨迹应设计为SN向,储层压裂改造压力应大于85 MPa。
Shahezi Formation in Xujiaweizi Fault Depression is one of the important layers in tight gas exploration of Songliao Basin,the tight gas discoveries and horizontal well drilling more and more depend on the understandings of the earth stress. With the help of well wall caving and crack inducting methods,the direction of the maximum main stress in Shahezi Formation of Xujiaweizi Fault Depression is considered to be nearly WE. According to the P and s-wave velocities in the whole block and individual well,the dynamic elastic parameters were calculated,and moreover based on Newberry Model,the current principal stress of the formation was computed,the maximal horizontal principal stresses is 85- 93 MPa,the minimal horizontal principal stresses is 69- 77 MPa. The achievements show that the horizontal-well track deployment should be designed in SN direction and the reservoir fracturing pressure should be greater than 85 MPa.

关键词(KeyWords): 徐家围子断陷;沙河子组;井壁崩落法;诱导裂缝法;水平主应力
Xujiaweizi Fault Depression;Shahezi Formation;well diameter/wall caving/avalanche/slough method;crack inducting method;horizontal principal stress

Abstract:

Keywords:

基金项目(Foundation): 中国石油重大专项“大庆探区非常规油气勘探开发关键技术研究与现场试验”(2012E-2603)

作者(Author): 杨亮
YANG Liang

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