南沙中部海域油气地质条件分析与评价  

PETROLEUM GEOLOGY AND EVALUATION OF THE MIDDLE NANSHA AREA, SOUTH CHINA SEAS

作　　者：曾祥辉[1] 姚永坚 易海 

机构地区：[1]成都地质学院石油系

出　　处：《南海地质研究》2002年第13期62-71,共10页Gresearch of Eological South China Sea

摘　　要：在南沙中部海域发育了古新统—下渐新统(上渐新统)、上渐新统(下中新统)—中中新统、上中新统—上新统三套油气源岩,其有机质类型以Ⅱ-Ⅲ型为主。根据David.A.Wood(1988)所提出的TTI值和计算方法及R_0值的关系,确定研究区生油、气门限,并分析了有机质成熟度的热演化史。在研究区发育有古新世—晚中新世砂岩、晚渐新世—中新世(或上新世)碳酸盐岩两大类型的储集层,在南部、中部西南侧、西北部均具有良好的区域性盖层,并发现有断块、断背斜、断鼻、背斜、台地生物礁(礁隆)等地层圈闭类型。因此研究区内具有良好的油气地质条件。Paleocene to lower Oligocene (upper Oligocene), upper Oligocene(lower Miocene) to middle Miocene, upper Miocene to Pliocene contained Ⅱ_B—Ⅲ type kerogene, may be three suites of oil and gas-bearing rock in the middle Nansha area, the South China Seas. Based on the thermo-evolution history of organic material and put forwarod TTI method and R_0 values according to David A. Wood's method (1988), the writers confirm the oil and gas and analyse the maturity of organic material hot evolution histories. Two kinds of reservoirs, i. e., sandstones of Paleocene-late Miocene and late Oligocene-Miocene (Pliocene) may be discovered in the region. Good caprocks, tectonic traps and stratum traps and faulted blocks, faulted anticlines, anticlines and platform reefs (reef rises), also have been found at the southern, southwestern of the middle and northwestern. Therefore, there is good petroleum geology study in the region.

关 键 词：油气地质条件 南沙中部海域 源岩 储集层 盖层 有机质热演化 

分 类 号：P744.4[天文地球—海洋科学]