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南沙海域西南部具有上始新统-下渐新统、上渐新统-中中新统、上中新统三套油气源岩,其有机质类型属Ⅱ_B-Ⅲ干酪根。根据DavidA. Wood (1988)计算不同地层的TTI值和R_o值,确定了研究区的生油门限深度,万安盆地南部为1700-3500m,曾母盆地西北部为1500-3500m,并分析了有机质成熟度的热演化史。研究区发育有三类储集层:渐新世-晚中新世砂岩、中-晚中新世台地灰岩或礁灰岩和前第三纪裂缝性风化基岩。区域盖层条件良好,并发现有四大类型的圈闭,即背斜、半背斜、断鼻和断块等构造及台地灰岩、礁隆和基岩潜山等地层圈闭类型。作者最后将研究区划分为三个含油气远景区。
The southwestern Nansha Sea has three kinds of source rocks of Upper Paleocene-Lower Oligocene, Upper Oligocene-Middle Miocene, and Middle-Upper Miocene, and its organic matter type belongs to Ⅱ_B-Ⅲ kerogen. According to the calculation of TTI and R_o values of different formations by David A. Wood (1988), the oil production threshold depth was determined in the study area. The southern margin of Wanan Basin was 1700-3500m and the northwest of Zengmu Basin was 1500-3500m. The organic matter Maturity of the thermal evolution history. There are three types of reservoirs developed in the study area: Oligocene-Late Miocene sandstones, Mid-Late Miocene plateau limestone or reef limestone and Pre-Tertiary fractured weathered bedrock. There are four types of traps in the region, including four types of traps, namely anticline, semi-anticline, nose-break and fault block, and stratigraphic traps such as platform limestone, reef and bedrock buried hill. The author finally divides the study area into three oil-gas prospect areas.