琼东南盆地北礁凹陷多边形断层发育特征及成因
发布时间：2018-12-17 12:44
【摘要】：基于高精度三维地震解释和相干属性分析,发现琼东南盆地北礁凹陷三维区中新统三亚组、梅山组、黄流组发育大量多边形断层。梅山组顶面发育呈近EW向展布的长条形丘和丘间底流水道,其上方分别发育近EW向(多边形)断层密集带和近SN向横截水道(多边形)断层。北部泥岩区,丘规模越大,断层密集带越宽,断层密集带主要分布在黄流组下部和梅山组上段地层中,横截底流水道断层向上延伸较短,向下延伸至梅山组或三亚组,而梅山组至三亚组多边形断层逐渐呈现多边形形态。西南部砂岩区,黄流组底部断层密集带和横截水道断层比北部规模小,延伸短,梅山组下段发育近NE向横截浊积水道砂岩断层和近NW向平行浊积水道边界断层,其规模更小。重力扩展可以很好地解释黄流组断层密集带和横截底流水道断层的形成,梅山组和三亚组的多边形断层是超压水力破裂的结果,同时大颗粒砂岩抑制多边形断层的形成。在我国首次发现断层密集带和横截水道断层,该类断层对油气运移、识别强振幅地质体和丘形反射成因具有重要的意义。
[Abstract]:Based on the high precision 3D seismic interpretation and coherent attribute analysis, it is found that a large number of polygonal faults are developed in the Miocene Sanya formation, Meishan formation and Huangyu formation in the three dimensional area of Beijiao depression, Qiongdongnan Basin. The top surface of Meishan formation is characterized by long hills and interhilar channels distributed in the direction of EW, where there are close EW (polygonal) fault-dense zones and near SN transected waterways (polygons) faults. In the northern mudstone area, the larger the hilly area is, the wider the fault dense zone is. The fault dense zone mainly distributes in the lower part of Huangliu formation and the upper member of Meishan formation, and the fault extension of transversal bottom flow channel is shorter up and down to Meishan formation or Sanya formation. The polygonal faults from Meishan formation to Sanya formation gradually show polygonal shape. In the southwestern sandstone area, the bottom fault dense zone and transversal channel fault of Huangliu formation are smaller in scale and shorter in extension than in the north. In the lower part of Meishan formation, the sandstone fault near NE transversally truncated hydrocephalus and the boundary fault near NW parallel turbid hydrops are developed, and the scale is much smaller. Gravity extension can well explain the formation of the fault dense zone and transversal channel fault in Huangliu formation, the polygonal fault of Meishan formation and Sanya formation is the result of overpressure hydraulic fracture, and the formation of polygonal fault is restrained by large granular sandstone. It is the first time to find fault dense zones and transversal channel faults in China. These faults are of great significance to oil and gas migration and identification of strong amplitude geological bodies and mound reflection origin.
【作者单位】： 西北大学地质学系大陆动力学国家重点实验室;
【基金】：国家重大专项“南海北部深水区大型生物礁滩分布与成藏条件分析”(2011ZX05025-006-02) 国家自然科学基金重大项目(41390451)联合资助
【分类号】：P618.13
本文编号：2384216
[Abstract]:Based on the high precision 3D seismic interpretation and coherent attribute analysis, it is found that a large number of polygonal faults are developed in the Miocene Sanya formation, Meishan formation and Huangyu formation in the three dimensional area of Beijiao depression, Qiongdongnan Basin. The top surface of Meishan formation is characterized by long hills and interhilar channels distributed in the direction of EW, where there are close EW (polygonal) fault-dense zones and near SN transected waterways (polygons) faults. In the northern mudstone area, the larger the hilly area is, the wider the fault dense zone is. The fault dense zone mainly distributes in the lower part of Huangliu formation and the upper member of Meishan formation, and the fault extension of transversal bottom flow channel is shorter up and down to Meishan formation or Sanya formation. The polygonal faults from Meishan formation to Sanya formation gradually show polygonal shape. In the southwestern sandstone area, the bottom fault dense zone and transversal channel fault of Huangliu formation are smaller in scale and shorter in extension than in the north. In the lower part of Meishan formation, the sandstone fault near NE transversally truncated hydrocephalus and the boundary fault near NW parallel turbid hydrops are developed, and the scale is much smaller. Gravity extension can well explain the formation of the fault dense zone and transversal channel fault in Huangliu formation, the polygonal fault of Meishan formation and Sanya formation is the result of overpressure hydraulic fracture, and the formation of polygonal fault is restrained by large granular sandstone. It is the first time to find fault dense zones and transversal channel faults in China. These faults are of great significance to oil and gas migration and identification of strong amplitude geological bodies and mound reflection origin.
【作者单位】： 西北大学地质学系大陆动力学国家重点实验室;
【基金】：国家重大专项“南海北部深水区大型生物礁滩分布与成藏条件分析”(2011ZX05025-006-02) 国家自然科学基金重大项目(41390451)联合资助
【分类号】：P618.13
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