摘要
克拉通盆地沉积地层厚度大,具备多套生-储-盖组合,是油气聚集的有利场所。根据对克拉通盆地典型准层序(湖泊三角洲碎屑岩准层序、潮间-潮上带白云岩准层序、浅海礁准层序和陆表海含煤层系准层序)组成的研究,认识到克拉通盆地准层序具有快速水进与缓慢水退的特征,由此形成了薄层退积与厚层加积和(或)进积的地层组合。克拉通盆地准层序的这种特征是由其事件性的沉降机制决定的,也与其具有低缓的沉积地形和广阔的可容空间相关。克拉通盆地准层序的这种特征也控制了其储层分布。储层主要发育在准层序的中、上部,即在准层序缓慢水退的中-晚期,在可容空间逐渐减小情况下,沉积环境水动力增强,粗碎屑供应增加,相应储层发育。
There were huge thickness of strata and multiple assemblages of source rock-reservoir-cover in cratonic basin,which was the area for hydrocarbon accumulation.It was realized by studying the typical parasequences in cratonic basin that the parasequences had the characteristics of rapid transgression and slow regression,by which thin retrogradation and thick accretion and/or progradation strata combinations were induced based on investigations on typical parasequences developed in cratonic basin,such as terrigenous clastic parasequences in the lacustrine delta,dolomite parasequences in the intertidal-supratidal zone,reef parasequences in the shallow sea and coal-bearing measure parasequences in the epicontinental sea.The distinctive parasequences were controlled by event-based subsidence mechanism and also associated with the low-flat depositional relief and extensional accommodation space in cratonic basin.The characters of parasequences in cratonic basin also dominate the reservoir distribution.The reservoirs are mainly grown in the middle and upper parts of parasequences,namely reservoirs are commonly developed during the medium-late period of slow regression process in a parasequence cycle that accommodation space has been gradually reduced,transport power of depositional setting is enhanced and supply of coarser clastic rocks is raised.
出处
《石油天然气学报》
CAS
CSCD
2013年第7期6-9,1,共4页
Journal of Oil and Gas Technology
基金
国家科技重大专项(2008ZX05009)
关键词
快速水进
缓慢水退
克拉通盆地
准层序
储层
rapid transgression
slow regression
cratonic basin
parasequence
reservoir
