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四川盆地西南部晚三叠世须二段致密砂岩储集物性受构造裂缝明显影响。根据研究区露头地层、钻井岩芯及岩石薄片实物资料,同时利用古地磁岩芯定向和ESR测年分析,对研究区构造裂缝优势方位、宽度、间距、充填物以及裂缝发育程度和形成期次进行了分析。结果表明,研究区主要发育有4组构造裂缝,分别为北东向、北西向、近东西向和东东南向,其中优势方位为北东—南西、北西—南东和近东西方向。构造裂缝发育期次主要为印支晚期、燕山晚期、喜马拉雅早期与喜马拉雅晚期,其中印支晚期与喜马拉雅期构造活动最为强烈,裂缝较为发育。
The structural properties of tight sandstone reservoirs in the second member of Upper Triassic Xu 2 Member in the southwestern Sichuan Basin were significantly affected by structural fractures. According to the physical data of outcrop strata, drilling cores and thin rock slices in the study area, taking advantage of the geomagnetic core orientation and ESR dating analysis, we analyzed the dominant azimuths, widths, spacings, filling materials and the degree of fracture development and formation period Analyzed. The results show that there are four major structural fractures in the study area, which are north east, north west, near east and west east and southeast, respectively. The dominant azimuths are north east-south west, north west-south east and near east-west. The main tectonic fractures are mainly the late Indosinian, the late Yanshanian, the early Himalayan and the late Himalayas, of which the late Indosinian and Himalayan tectonic activities were the most intense with more fractures.