摘要
为指导柴达木盆地西部地区古近系—新近系咸化湖盆油气勘探,建立咸化湖盆聚砂富砂模式,结合青海湖现代咸化湖盆沉积考察结果,开展了咸水介质条件下的三角洲沉积模拟实验研究,实验表明:咸化湖盆三角洲沉积以三角洲平原相为主,可占整个三角洲面积的80%以上,而在三角洲前缘亚相中河口坝微相最为发育;同时表明咸水介质对不同粒度沉积物的搬运距离及沉积有控制作用,较淡水介质,咸水介质中细粒沉积物在河口区快速沉降,而粗粒沉积物搬运距离更远,沉积范围也广;模拟结果也表明咸化湖盆三角洲沉积纵向上"坝上河"砂体构型发育。咸化湖盆三角洲沉积模拟实验的成功,明确了咸化湖盆储层分布特征,拓展了储层分布范围,为柴达木盆地西部地区油气勘探提供技术支持。
In order to guide the exploration of saline basin from Palaeogene to Neogene in western Qaidam Ba-sin,models of sands control and enrichment in saline basin were constructed,combining with field study of modern saline basin sedimentary characteristics of Qinghai lake.Delta sedimentary simulating experiment in salt water medium was carried out.The research results of delta sedimentary simulating experiment in salt water me-dium indicated that the sedimentary facies of saline basin delta is mainly composed by plain facies,accounting for over 80% of the entire delta area,and mouth bar microfacies in the delta front sub-facies is the most devel-oped.The results show that the saline water medium controls the distance of transportation of various granulari-ties,contrasting with water medium which less saline,fine-grained sediments in saline water were rapidly de-posited in the mouth of river,and the coarse sediments transported farther,the sedimentary range were also more larger.The results indicate that saline basin delta sediment developed sand body architecture of river-over-bar sand body,on the longitudinal.Delta sedimentary simulating experiment defines the distribution characteris-tic of reservoir,enlarges the range of reservoir,and provides a technical support on oil-gas exploration in west-ern Qaidam Basin.
出处
《现代地质》
CAS
CSCD
北大核心
2014年第6期1284-1288,共5页
Geoscience
基金
中国石油重大科技专项"柴达木盆地石油勘探领域评价与目标优选"(2011E-0301)
关键词
沉积模拟
咸化湖盆
三角洲
沉积特征
柴达木盆地
sedimentary simulation
saline basin
delta
sedimentary feature
Qaidam Basin
