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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。
In the middle part of the Nansha Sea, there are three sets of Palaeo-Lower Oligocene (Upper Oligocene), Upper Oligocene (Middle Miocene) -Middle-Middle Miocene, Upper Miocene-Upper Pleistocene , The type of organic matter mainly Ⅱ-Ⅲ type. According to the relationship between TTI value, calculation method and R_0 value proposed by David A. A. Wood (1988), the oil and gas thresholds were determined and the thermal evolution history of organic matter maturity was analyzed. In the study area, there are two types of reservoirs: the Pliocene-Late Miocene sandstone, the Late Oligocene-Miocene (or Pliocene) carbonate rocks, and the southern, central and southwestern sides and the northwest All of them have good regional caprock, and have been found to have such traps as fault blocks, faulted anticline, broken nose, anticlines and platform reefs (reefs). Therefore, the study area has good oil and gas geological conditions.