摘要
万安盆地勘探程度较低,运用PetroMod软件,对其烃源岩成熟史进行了模拟。盆地模拟结果表明:盆地内发育3套烃源岩,其中西卫群、万安组为主力烃源岩,李准组为次要烃源岩,生烃门限深度在3 400 m左右,3套烃源岩分别在18,10和7 Ma进入生烃门限,西卫群和万安组烃源岩现今绝大部分已处于高成熟—过成熟阶段,以生气为主,而李准组烃源岩现今处于低—中成熟阶段,以生油为主。万安盆地中部坳陷为盆地内最大的富烃和生烃坳陷,热演化程度高于其他构造单元,沟通烃源岩与储层的深大断裂对油气运移起重要的输导作用,新近系油气成藏的关键时期为早上新世,且新近系储层总体上以气藏为主。
The Wan'an basin is explored in primary stage. Herein, we restored the source rock evolution history in the Wan'an basin by means of PetroMod software. The main conclusions in this paper are as follows: there are three sets of mature hydrocarbon source rocks in the Wan'an basin, including the Xiwei group and the Wan'an formation which are the main source rocks and the Lizhun formation which is the secondary source rock. The oil threshold is mainly at 3400m, these three sets of the source rocks ever matured in 18 Ma, 10 Ma and 7 Ma, respectively. Nowadays, source rocks in the Xiwei group and Wan'an formation are in the gas generation stage; those in the Lizhun formation are in the oil generation stage. The central depression of the Wan'an basin which is a hydrocarbon-generating abundant depression is at a higher maturity stage than other tectonic units. The deep fault connecting the source rocks and the reservoirs served as the important hydrocarbon migration pathway. The crucial time of hydrocarbon accumulation in Neogene is on the beginning of Pliocene. Nowadays, hydrocarbon preserved in the traps of Neogene is mainly gas.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2011年第2期34-37,113,共4页
Petroleum Geology and Recovery Efficiency
基金
国家重点基础研究发展计划"973"项目"南海大陆边缘动力学及油气资源潜力"(2007CB411705-06)
关键词
烃源岩
热成熟史
数值模拟
含油气系统
万安盆地
source rock
maturity history
numerical simulation
Wan'an basin
petroleum system
