THE CHARACTERISTICS OF HYDROCARBON SOURCE ROCKS AND EXPLORATION PROSPECTS OF LOW MATURE OIL AND GAS/BIO-GAS IN HEPU BASIN
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摘要: 南海北部陆缘广西合浦盆地油气勘探迄今尚未取得突破,其根本原因是对该区基本油气地质条件及油气地质规律认识尚不够深入。合浦盆地主要烃源岩与百色盆地一样,均属成熟度偏低的始新统中深湖相暗色泥质岩系,其低熟烃源岩与低熟油气特征及其成藏地质条件亦基本一致。在深入分析研究合浦盆地低熟烃源岩有机质丰度、生源母质类型及热演化特征的基础上,重点对其低熟油气及生物气的地球化学特征与百色盆地进行了类比,指出合浦盆地古近系具备低熟油气/生物气的基本地质条件,其油气勘探方向及勘探策略,应借鉴百色盆地的成功经验,重点勘探寻找低熟油气及生物气资源。Abstract: No breakthrough has been made so far in the Hepu Basin, the northern margin of the South China Sea, for oil and gas exploration, due to lack of in-depth understanding of geological conditions for petroleum accumulation. Major hydrocarbon source rocks in the basin are low matured dark mudstone series in the center of an Eocene deep lake, and its characteristics and geological conditions for accumulation of the low matured oil and gas from immature source rocks are similar to those in the Baise Basin. In this paper, in-depth analysis of the abundance, type and maturity of organic matters of the low matured source rocks in the Hepu basin is made, focusing on comparison with the analogy of the Baise Basin. It is concluded that the Paleogene hydrocarbon source rocks in the Hepu Basin have favorable geological conditions for generation of low mature oil and gas/bio-gas. Therefore, we can learn from the case in the Baise Basin, which has earned successful experience in exploration of law matured oil and gas/bio-gas, to establish the exploration direction and strategy for low maturity oil and gas and biogas resources in the Hepu Basin.
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