摘要
根据陕甘宁盆地延河剖面、延长川口油田以及长庆安塞油田的裂缝研究资料,分析了盆地内裂缝的走向、成因类型,提出陕甘宁盆地为稳定盆地,盆地内褶皱和断层相对不发育,但裂缝广泛存在;盆地内的E—W向区域裂缝最发育,主要形成于燕山期;其次为NE向裂缝,为喜山期构造运动的产物;野外露头上的裂缝方位和实际注水动态反映的裂缝方位存在不一致的现象,主要与由裂缝形成期的古构造应力场、现今构造应力场和盆地内砂体的展布方向有关;控制裂缝发育的主要地质因素是沉积相。
Some conclusions have been drawn from the analysis of the fracture direction and formation types based on the fracture data of the Yanhe section,Chuankou Oilfield of Yanchang and Ansai Oilfield of Changqing.It is found that although folds and faults are few in the basin,fractures can be formed.The EW regional fractures were formed during the Yanshan periods and the NE fractures were formed during the Xishan periods.The disagreement of the fracture direction measured on the outcrop with that reflected by the waterflooding,which is mainly related to the palaeotectonic stress field,present stress field and sand trend.While the fracture distribution and density are controlled by lithology and rock thickness.
出处
《地质科技情报》
CAS
CSCD
北大核心
2003年第2期21-24,共4页
Geological Science and Technology Information
