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近年来我部对北部湾盆地的石油勘探,已发现三个含油构造;获得上第三系角尾组、下第三系流沙港组一、二、三段、石炭系碳酸盐岩古潜山等五个工业性油层.从现有分析资料的研究表明,下第三系流沙港组为盆地中主要的生油层,它具有生油泥质岩厚度大(暗色泥岩总厚793.5米,占本组厚度64.8%.地震资料解释在凹陷中部厚达2000米以上,为弱—无反射波组,反映大套泥质岩);有机质丰度高(有机碳含量1.0—2.6%,氯仿沥青“A”含量 0.1—0.28%,总烃含量700—1800PPM);有机质类型好(腐泥型—混合型);转化程度高(A/C>0.1,烃/C>0.05);广泛分布于各凹陷中,埋藏深度在1500米以下,按我国陆相生油岩评价标准属于好一最好生油岩,可与我国东部各主要含油盆地下第三系生油层媲美.
In recent years, the Ministry of Petroleum has identified three oil-bearing structures in the Beibu Gulf Basin for petroleum exploration. They have obtained the first, second and third sections of the Upper Tertiary Member Qiaoxue Formation and the Lower Tertiary Liushagang Formation, the Carboniferous Carbonate Buried Hill , Etc. From the existing analysis data, the research shows that the Lower Third Series Liushagang Formation is the main oil generating layer in the basin, and it has thick petrologic rocks with a total thickness of 793.5 meters The thickness is 64.8% .These seismic data are interpreted as thicker than 2000 meters in the central part of the depression, which is a weak-no reflection wave group, which reflects a large set of argillaceous rocks. The abundance of organic matter is high (organic carbon content 1.0-2.6% (0.1 ~ 0.28% of the total content), total hydrocarbon content of 700-1800PPM); organic matter of good type (sapropel - mixed); high degree of conversion (A / C> 0.1, hydrocarbon / The burial depth is below 1,500 meters. According to the evaluation criteria of terrestrial oil-bearing rocks in China, it belongs to one of the best oil-producing rocks and comparable to the third-member oil reservoirs in all the major oil-bearing basins in eastern China.