摘要
低位三角洲砂体是重要的油气储集体,通常发育在主要物源区前方,处于深湖相泥岩包围中,但有别于深水重力流沉积。对胶莱盆地下白垩统莱阳组的岩心描述中,发现莱阳组湖侵期水南段沉积期湖平面频繁变化的标志——深水沉积中与暗色泥岩互层的一些浅水标志,如雨痕、泥裂、冲刷泥砾等;在水南段单井相分析中发现,大套的暗色泥岩中发育非重力流沉积砂体;在水南段野外露头的观察描述中也发现干裂、雨痕等浅水暴露标志的沉积构造与暗色泥岩互层。水南段深湖半深湖相中发育低位三角洲砂体,可以形成有利储层。
Lowstand delta sands are important reservoirs of oil and gas,usually developed in front of the major provenance,surrounded by mudstones of deep lacustrine facies,but different from deepwater gravity flow deposition. Core description for lower Cretaceous Laiyang formation in Jiaolai basin has found marks of frequent lake level changes during Shuinan depositional stage in lacustrine transgression phase—some shallow water marks interbedded with dark mudstone in deep water sedimentation,such as rain print,mud crack and scour mud pebble. Single well facies analysis of Shuinan interval has shown that sands of non-gravity flow deposition had developed in the massive dark mudstone. Marks of shallow water exposure such as desiccation crack and rain print are also found interbedded with dark mudstone in observation of Shuinan outcrop. The lowstand delta sands developed in the deep-semi deep facies of Shuinan interval may have favorable reservoirs.
出处
《特种油气藏》
CAS
CSCD
2010年第2期45-47,51,共4页
Special Oil & Gas Reservoirs
基金
国家重点基础研究发展规划"973"项目(2006CB202302)部分内容
关键词
低位三角洲
相层序
相标志
相模式
湖平面变化
胶莱盆地
lowstand delta
facies sequence
facies mark
facies model
change of lake level
Jiaolai basin
