摘要
广西合浦、南宁、宁明等第三系盆地的主要烃源岩层与百色盆地一样,均是中始新统深湖—半深湖相暗色泥质岩层,特点是分布面积广,厚度大,有机质丰度高。有机碳含量多数大于2.0%,达到"好"到"最好"的评价标准。有机质成熟度多数处于低熟阶段,部分在成熟阶段。干酪根类型主要为Ⅱ1型。综合分析认为:合浦、南宁、宁明三个盆地都具有优质的生烃物质基础,也有好的储集保存条件,都具有一定的油气勘探潜力。但烃源岩有机质成熟度除了合浦常乐凹陷进入成熟阶段能生成成熟油气外,其余的南宁盆地、宁明盆地及合浦盆地西场凹陷都在低熟阶段,所以应以勘探低熟油气为主。
There are over 30 Cenozoic basins in Guangxi province.The main source rocks in Hepu,Nanning and Ningning Basins among them,as that in Baise Basin where some industrial oil and gas fields have been discovered,are middle Eocene deep and semi-deep lacustrine dark argillaceous rocks,which is characterised by wide distributing area,large sedimentary thickness and high abundance of organic matter.It is shown that most of TOC values are over 2.0%,which reaches to the ＂good＂ and/or ＂excellent ＂ source rocks in the Evaluation Criterion of Organic Matter Abundance for Continental Source Rocks.Most of organic matter are in low mature stage and parts of are in mature stage.Kerogen commonly belongs to Type Ⅱ1.Comprehensive analysis indicates that the former three basins possess of the foundation of good hydrocarbon-generating substance and also good conditions of accumulation and preservation so that they are of some oil and gas exploration potential.The organic matter is in low mature stage in Nangning Basin,Ningming Basin and Xichang Depression of Hepu Basin except for Changle Depression of Hepu Basin in mature stage.It is suggested that the exploration targets should focus on the basins or depression with the low maturity of organic matter.
出处
《海相油气地质》
2011年第1期33-44,共12页
Marine Origin Petroleum Geology
关键词
第三系
烃源岩
有机地球化学特征
勘探潜力
合浦盆地
南宁盆地
宁明盆地
百色盆地
Tertiary
Source rock
Organic Geochemical Characteristics
Exploration Potential
Hepu Basin
Nanning Basin
Ningming Basin
Baise Basin
