【摘要】：基于高精度三維地震解釋和相干屬性分析,發(fā)現(xiàn)瓊東南盆地北礁凹陷三維區(qū)中新統(tǒng)三亞組、梅山組、黃流組發(fā)育大量多邊形斷層。梅山組頂面發(fā)育呈近EW向展布的長條形丘和丘間底流水道,其上方分別發(fā)育近EW向(多邊形)斷層密集帶和近SN向橫截水道(多邊形)斷層。北部泥巖區(qū),丘規(guī)模越大,斷層密集帶越寬,斷層密集帶主要分布在黃流組下部和梅山組上段地層中,橫截底流水道斷層向上延伸較短,向下延伸至梅山組或三亞組,而梅山組至三亞組多邊形斷層逐漸呈現(xiàn)多邊形形態(tài)。西南部砂巖區(qū),黃流組底部斷層密集帶和橫截水道斷層比北部規(guī)模小,延伸短,梅山組下段發(fā)育近NE向橫截濁積水道砂巖斷層和近NW向平行濁積水道邊界斷層,其規(guī)模更小。重力擴(kuò)展可以很好地解釋黃流組斷層密集帶和橫截底流水道斷層的形成,梅山組和三亞組的多邊形斷層是超壓水力破裂的結(jié)果,同時大顆粒砂巖抑制多邊形斷層的形成。在我國首次發(fā)現(xiàn)斷層密集帶和橫截水道斷層,該類斷層對油氣運移、識別強振幅地質(zhì)體和丘形反射成因具有重要的意義。
[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.
【作者單位】： 西北大學(xué)地質(zhì)學(xué)系大陸動力學(xué)國家重點實驗室;
【基金】：國家重大專項“南海北部深水區(qū)大型生物礁灘分布與成藏條件分析”(2011ZX05025-006-02) 國家自然科學(xué)基金重大項目(41390451)聯(lián)合資助
【分類號】：P618.13

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