文莱-沙巴盆地北内带构造区中中新统烃源岩地球化学特征及生烃史  

The Hydrocarbon Generation History and Geochemical Characteristics of Source Rocks of Middle Miocene in Northern Inboard Belt Structural Area of Brunei-Sabah Basin

作　　者：张厚和[1] 廖宗宝 王登 徐耀辉[3] 

机构地区：[1]中国海洋石油研究总院,北京100028 [2]湖北省地质调查院,湖北武汉430030 [3]油气资源与勘探技术教育部重点实验室(长江大学),湖北武汉430100

出　　处：《长江大学学报（自科版）（中旬）》2016年第5期9-15,2,共7页Journal of Yangtze University(Nature Science Edition)

基　　金：国家科技重大专项(2011ZX05025-005)

摘　　要：在广泛收集烃源岩样品有机地球化学资料和分析测试的基础上,结合区域地质特征,从烃源岩生烃潜力、生烃史以及生物标志化合物等方面,对文莱-沙巴盆地北内带中中新统烃源岩地球化学特征进行综合研究。研究表明:北内带中中新统烃源岩厚度较大,中中新统下段主要为下海岸平原煤和炭质泥岩、海相泥岩,上段(StageⅣB)主要为海相泥岩;有机质丰度较高,有机质类型主要为Ⅲ型,少量Ⅱ2型,指示高等植物生源的奥利烷和双杜松烷(W和T构型)丰度较高;成熟度呈现出东低西高的特征,主要处于低成熟-成熟阶段。生烃史模拟表明,中中新统下段烃源岩在距今约8.7Ma进入生烃门限,8.1Ma进入成熟热演化阶段,对应的门限深度约为4000m,在距今约4.5Ma进入高成熟阶段;而中中新统上段烃源岩在距今约3.8Ma进入生烃门限,对应的门限深度约为3350m,在距今约2Ma其底部进入成熟热演化阶段。Based on the wide collection of organic chemistry data and analysis of source rock samples,combined with regional geologic features,the geochemical characteristics of source rocks of middle Miocene in the northern inboard belt structure in Brunei-Sabah Basin were researched from the aspects of hydrocarbon potential,thermal evolution history and biomarker.Study illustrated that the source rocks of middle Miocene in the northern inboard belt were thicker,the structure of underside was mainly low coast plain coal,carbonacesous mudstone and marine mudstone.On the topside(StageⅣB)there was mostly marine mudstone,the organic matter abundance was higher,the type of organic matter was mainly Type Ⅲ with less of TypeⅡ2,the abundance of Oleanane and Bicadinane(Types W and T)was higher in higher plant,its maturity represented that it was low in the east and high in the west,it was mainly of lower maturity-maturity.The hydrocarbon generation history matching indicates that the source rocks of middle Miocene reach the hydrocarbon generation threshold being nearly8.7Ma from now and reach the mature thermal evolution stage being 8.1Ma from now,the corresponding threshold depth is 4000 m,it is entered the high-matured stage in almost4.5Ma from now.The topside of source rocks enter the hydrocarbon generation threshold in nearly3.8Ma,the corresponding threshold depth is 3350 mand it enters the matured thermal evolution stage from the bottom in about 2Ma.

关 键 词：烃源岩 地球化学特征 生烃史 文莱-沙巴盆地 中中新统 

分 类 号：TE021.1[石油与天然气工程]