苏北盆地高邮凹陷泰州组烃源岩演化

运用盆地模拟方法,对苏北盆地高邮凹陷泰州组烃源岩的埋藏史、温度史、成熟度史及生油史进行研究发现,三垛早期,泰二段烃源岩进入成熟阶段,R_o达0.6%,且随着埋深增大,地层温度、烃源岩成熟度和生烃能力也逐渐增加;三垛末期,地层埋藏深度、温度及烃源岩成熟度都达到最大,分别为3000m,110℃和0.8%,同时烃源岩生油量也达顶峰,东部的焦1井高达350mg/g。由此看出,三垛时期是高邮凹陷泰二段烃源岩生、排烃的主要时期。另外,由于三垛时期构造、断层活动强烈,圈闭大多定型,因而综合分析认为,三垛时期也是油气运移、成藏的有利和主要时期。 

HYDROCARBON SOURCE ROCK EVOLUTION IN TAIZHOU FORMATION, THE GAOYOU SAG, THE NORTH JIANGSU BASIN

Researches on burial,temperature,maturity and oil generation histories of hydrocarbon source rocks of Taizhou Formation in the Gaoyou Sag,the North Jiangsu Basin with basin modeling methods have indicated that,hydrocarbon source rocks of Tai2 Member have entered mature stage and R_o has reached 0.6% during the early Sanduo period.As stratigraphic burial depth increases,stratum temperature,source rock maturity and hydrocarbon generation ability also increase gradually.In the end of Sanduo period,stratigraphic burial depth,temperature and hydrocarbon source rock maturity have reached the maximum,3 000 m,110℃,0.8%,respectively.At the same time,oil generation also reaches the maximum,and oil generation content of Well Jiao1 in the east reaches 350 mg/g.So,Sanduo period is the main stage during which Tai2 Member source rock generates and discharges hydrocarbon.In addition,tectonic and fault activities are strong during Sanduo period and most traps are formed.Therefore,Sanduo period is also the favorable and main period for oil-and-gas migration and accumulation.