致密砂岩储层岩石定向实验技术研究
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摘要
致密砂岩储层在钻探过程中获取的地下岩石一般都是非定向岩样,而通过这些非定向岩心研究储层水平主地应力方向是石油勘探开发重要的基础工作之一。致密储层地应力状态、地层岩石的力学性质决定着水力裂缝的起裂形态、延伸方向、高度和宽度,而水力裂缝的几何形态是影响压裂措施增产效果的主要因素之一。文章开展岩心定向综合实验测量方法研究,利用黏滞剩磁法、波速各向异性法,形成了一套致密砂岩非定向岩心室内实验综合测量及解释技术,通过水力压裂微地震地面监测,证实了室内岩心定向技术的可靠性。
Core samples which taken from the tight sandstone reservoir are generally non-directional,it is very important to study the horizontal principal stress direction for petroleum exploration and development through the non-directional rocks. As the special geological features,gas wells in tight sandstone reservoirs have lower productivity,these wells need to improve productivity by hydraulic fracturing. Hydraulic fracture morphology includes extension direction,height and width,the geometry of hydraulic fracture was decided by in-situ stress and affected productivity of gas wells. This paper presented a summary of how to measure the in-situ stress direction,the measurement method has been set up including acoustic velocity anisotropy and viscous remanence,the result of laboratory measurement has been verified by hydraulic fracturing and microseismic monitor. The measurement method to in-situ stress would support efficient development of tight sandstone reservoirs.
Core samples which taken from the tight sandstone reservoir are generally non-directional,it is very important to study the horizontal principal stress direction for petroleum exploration and development through the non-directional rocks. As the special geological features,gas wells in tight sandstone reservoirs have lower productivity,these wells need to improve productivity by hydraulic fracturing. Hydraulic fracture morphology includes extension direction,height and width,the geometry of hydraulic fracture was decided by in-situ stress and affected productivity of gas wells. This paper presented a summary of how to measure the in-situ stress direction,the measurement method has been set up including acoustic velocity anisotropy and viscous remanence,the result of laboratory measurement has been verified by hydraulic fracturing and microseismic monitor. The measurement method to in-situ stress would support efficient development of tight sandstone reservoirs.
引文
[1]康毅力,罗平亚.中国致密砂岩气藏勘探开发关键工程技术现状与展望[J].石油勘探与开发,2007,34(2):239-245.
[2]马寅生.地应力在油气地质研究中的作用、意义和研究现状[J].地质力学学报,1997,3(2):41-46.
[3]林志强,杨甘生.定向取心技术在松科1井中的应用[J].探矿工程(岩土钻掘工程),2007(10)69-71.
[4]宋毅,伊向艺.地应力对垂直裂缝高度的影响及缝高控制技术研究[J].石油地质与工程,2008,22(1):75-77.
[5]侯守信,田国荣.古地磁岩心定向及其在地应力测量上的应用[J].地质力学学报,1999,5(1):90-96.
[6]沈海超.地应力测试及剖面建立的方法研究[D].中国石油大学硕士学位论文,2006.
[7]库丽曼·木沙太.川中地区上三叠统须家河组四段气藏成藏机理研究[D],成都理工大学博士论文,2007.
[2]马寅生.地应力在油气地质研究中的作用、意义和研究现状[J].地质力学学报,1997,3(2):41-46.
[3]林志强,杨甘生.定向取心技术在松科1井中的应用[J].探矿工程(岩土钻掘工程),2007(10)69-71.
[4]宋毅,伊向艺.地应力对垂直裂缝高度的影响及缝高控制技术研究[J].石油地质与工程,2008,22(1):75-77.
[5]侯守信,田国荣.古地磁岩心定向及其在地应力测量上的应用[J].地质力学学报,1999,5(1):90-96.
[6]沈海超.地应力测试及剖面建立的方法研究[D].中国石油大学硕士学位论文,2006.
[7]库丽曼·木沙太.川中地区上三叠统须家河组四段气藏成藏机理研究[D],成都理工大学博士论文,2007.
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