摘要
受多期构造运动影响,东营凹陷形成多期不整合面。其中新生界与中古生界不整合广泛分布于凹陷之中,其上覆地层与下伏地层的接触关系多为削超样式。不整合结构层中的风化粘土层,经过成岩压实作用,极易固结,形成非渗透层,具有很好的封堵效应。由于风化淋滤作用,不整合面下的风化砂砾岩、碳酸盐岩等的渗透性均得到不同程度的改善,成为输导油气甚至储集油气的有利场所。油气在不整合中运移主要通过2种方式:不整合结构层侧向输导和不整合"天窗"式垂向输导。受不整合削超或平超式、砂/泥型或泥/砂型等多种岩性组合的控制,东营凹陷南斜坡多发育地层超覆、不整合削截油藏。
Under multiphase tectonic activity,many unconformities were formed in the Dongying sag.Among them,the unconformities between Tertiary and pre-Tertiary exist widely.The main contact between overlying and underlying formations is truncation-overlap.The weathered layer in the unconformity structure went through the diagenetic compression,and is easily solidified to form the impermeability layer with good sealing.Under the weathering and leaching action,the permeability of glutenite and carbonate under the unconformity is improved,and becomes a favorable area of oil and gas migration or accumulation.Two pathways of oil and gas migration in the unconformity are lateral and vertical.Since the multi-contact styles constrain the petroleum accumulation,such as truncation-overlap or parallelism-overlap and sand/mud or mud/sand,stratigraphic overlap and unconformity truncation,the stratigraphic overlap and unconformity truncation oil reservoirs occur generally in the south slope of Dongying sag.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2012年第2期279-283,共5页
Natural Gas Geoscience
基金
国家重大科技专项"渤海湾盆地东营凹陷勘探成熟区精细评价示范工程"(编号:2008ZX05051)资助
关键词
东营凹陷
不整合
新生界
中古生界
油气成藏
Dongying sag
Unconformity
Cenozoic
Mesozoic-Paleozoic
Hydrocarbon accumulation.
