川西坳陷盐井沟构造沙溪庙组现今地应力方向
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摘要
川西坳陷盐井沟构造沙溪庙组属于低孔、低渗储层,现今地应力方向的研究是该区人工压裂获效的基础。通过追踪川西坳陷历年天然地震P波方向,结合相邻构造现今地应力方向的研究成果,对研究区现今地应力方向进行了分析和判断;在此基础上,通过单井取心古地磁定向实验和波速各向异性实验,进行现今最大主应力方向的测定和计算。结果发现,计算获得的现今地应力方向与天然地震和相邻构造上地应力方向具有一致性。综合各种资料及实验分析成果,判定研究区沙溪庙组现今地应力方向为北西向。
Reservoir of the Shaximiao Formation in the West Sichuan Depression is of low porosity and permeability.To know the current terrestrial stress direction is the basis for effective fracturing in this area.Through tracking down the P-wave direction of natural earthquakes in the West Sichuan Depression over the years and referring to researches on current terrestrial stress direction in adjacent structures,the current terrestrial stress direction of the study area is analyzed and predicted.By the paleomagnetic directional experiments and velocity anisotropy experiment with single-well core,the maximum principal stress direction is measured and calculated.The results show that the calculated current terrestrial stress direction is consistent with that of the adjacent structures.Eventually,according to various data and experimental results,the current terrestrial stress direction of the Shaximiao Formation in the study area is determined to be a NW direction.
Reservoir of the Shaximiao Formation in the West Sichuan Depression is of low porosity and permeability.To know the current terrestrial stress direction is the basis for effective fracturing in this area.Through tracking down the P-wave direction of natural earthquakes in the West Sichuan Depression over the years and referring to researches on current terrestrial stress direction in adjacent structures,the current terrestrial stress direction of the study area is analyzed and predicted.By the paleomagnetic directional experiments and velocity anisotropy experiment with single-well core,the maximum principal stress direction is measured and calculated.The results show that the calculated current terrestrial stress direction is consistent with that of the adjacent structures.Eventually,according to various data and experimental results,the current terrestrial stress direction of the Shaximiao Formation in the study area is determined to be a NW direction.
引文
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5邓莉.川西坳陷沙溪庙组气藏成藏主控因素探讨[J].断块油气田,2003,10(5):26～28
6肖富森,李正文,徐明华,等.川西盐井沟构造沙溪庙组砂体分布特征浅析[J].天然气工业,2004,24(11):42～44
7王二七,孟庆任.对龙门山中生代和新生代构造演化的讨论[J].中国科学(D辑:地球科学),2008,38(10):1 221～1 233
8张兴权,安玉玲.天然地震与构造裂缝、油气运移的关系研究[J].石油勘探与开发,2000,27(4):106～108
9国家地震科学数据共享中心.专题数据——中国震例[DB/OL].http://data.earthquake.cn/data,
10董树文,张岳桥,龙长兴,等.四川汶川8级地震的发震机理分析[DB/OL].http://www.geomech.ac.cn/wenchuandizhen.htm,
11李学森,吴汉宁,张小浩,等.钻井岩心重定向的古地磁方法及其可靠性研究[J].油气地球物理,2006,27(4):106～108
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13李天本,吴柏志,贾耀勤,等.桩西油田桩104块地应力测量技术及应用[J].油气地质与采收率,2001,8(4):48～50
14宛新林,席道瑛,叶青,等.岩石各向异性实验研究及对工程勘探的影响[J].中国煤炭地质,2008,20(8):39～41
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