摘要
曾母盆地和文莱—沙巴盆地是南海南部重要的油气富集盆地,但两者的油气储量却存在着很大的差异,曾母盆地天然气多于原油,文莱—沙巴盆地原油多于天然气,明确油气成藏控制因素对于上述两个盆地资源评价和勘探目标选择具有重要意义。为此,基于前人的研究成果,结合岩心和野外露头烃源岩样品的实验分析数据,对曾母盆地和文莱—沙巴盆地烃源岩有机质组成、生烃特征、烃源岩分布规律及热演化特征进行了系统分析,明确了两个盆地油气差异分布的控制因素。研究结果表明:①曾母盆地和文莱—沙巴盆地烃源岩包括煤系烃源岩和陆源海相烃源岩,其中煤系烃源岩壳质组丰富,生油潜力明显大于陆源海相烃源岩;②曾母盆地表现为“三角洲相煤系+滨浅海—半深海相陆源海相烃源岩”的分布模式,文莱—沙巴盆地表现为“三角洲/浊积煤系—陆源海相烃源岩”的分布模式;③曾母盆地烃源岩主体处于高成熟—过成熟生气阶段,文莱—沙巴盆地烃源岩主体处于成熟生油阶段。结论认为,在“源”和“热”的共同作用下,曾母盆地原油主要分布在东巴林坚凹陷,其他地区以分布天然气为主,文莱—沙巴盆地则整体以分布原油为主。
The Zengmu Basin and the Brunei-Sabah Basin are important oil and gas enriched basins,but they are quite different in oil and gas reserves.There is much more gas in the Zengmu Basin,but much more oil in the Brunei-Sabah Basin.Therefore,it is of great significance to clarify the oil and gas controlling factors for resource evaluation and exploration in these two basins.Based on previous research results and experimental analysis data of cores and outcrop source rock samples,this paper investigates the organic matter composition,hydrocarbon generation characteristics,distribution laws and thermal evolution characteristics of source rocks in these two basins,and clarifies the factors controlling their differential distribution of oil and gas.And the following research results are obtained.First,source rocks in the Zengmu Basin and the Brunei-Sabah Basin include coal-measure source rocks and terrigenous marine source rocks,among which,coal-measure source rocks are rich in exinite and their oil generation potential is much greater than that of terrigenous marine source rocks.Second,Zengmu Basin is in a distribution pattern of delta coal measure+littoral and neritic marine-bathyal terrigenous marine source rocks and Brunei-Sabah Basin is in a distribution pattern of deltaic/turbidite coal-measure–terrigenous marine source rocks.Third,the main source rocks in the Zengmu Basin are in a high-maturity and over-maturity gas generation stage,while those in the Brunei-Sabah Basin are in a mature oil generation stage.In conclusion,under the joint control of source rock and thermal evolution degree,oil in the Zengmu Basin is mainly distributed in the East Balinjian Depression and natural gas is dominant in other areas,while oil is dominant overall in the Brunei-Sabah Basin.
作者
李友川
赵志刚
兰蕾
杨树春
LI Youchuan;ZHAO Zhigang;LAN Lei;YANG Shuchun(CNOOC Research Institute Co.Ltd.,Beijing 100028,China)
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2021年第11期24-32,共9页
Natural Gas Industry
基金
国家科技重大专项“曾母—北康盆地群油气地质条件研究与勘探方向选择”(编号:2016ZX05026-004)。
关键词
中国南海
曾母盆地
文莱—沙巴盆地
烃源岩分布模式
热演化程度
油气差异
South China Sea
Zengmu Basin
Brunei-Sabah Basin
Distribution pattern of source rocks
Thermal evolution degree
Oil and gas difference
作者简介
李友川,1967年生,正高级工程师,硕士,主要从事油气地球化学研究工作。地址:(100028)北京市朝阳区太阳宫南街6号。ORCID:0000-0002-6501-5727。E-mail:liych@cnooc.com.cn。
