摘要
鄂尔多斯盆地是我国第二大盆地，也是我国陆上油气勘探最早的盆地，该盆地已发现的油气储量中，95％是地层，岩性等隐蔽型油气藏的储量，根据长期勘探实践总结出该盆地大油气田形成的主要地质规律为：91）生烃凹陷控制大油气田的分布；（2）沉积间断形成的两个假整合面是油气运移的主要通道；（3）古湖岸线附近的大型三角洲前缘带是三叠系油气田分布区；（4）古河道（古水系）两侧斜坡带是寻找侏罗系油气藏的有利场所；（5）古中央隆起带是古生界大气田形成的区域构造背景，古鼻隆与渗透性砂岩叠合区是大气田富集区，该盆地今后油气勘探要重视高新技术的发展，充分发挥高分辨率地震的作用，大力发展水平井，斜井，丛式井，强化酸化，压裂等高新技术的应用，要分小层编制三叠纪，侏罗纪岩相古地理图，研究古湖岸线，古河道的变迁，掌握油气田分布规律，以提高勘探效益。
Being the second biggest basin in China,Ordos basin is the first explored onshore basin. 95% of the discovered oil and gas reserves in the basin were found in subtle traps such as stratigraphy and lithology. Based on long term exploration practice,the geological characteristics of the forming of giant oil-gas fields in the basin are summed as follows: 1)hydrocarbon generated sags control the distribution of giant oil-gas fields;2) two disconformable surfaces resulted from sedimentary hiatus are the pathway for oil and gas migration; 3) big delta front zone close to paleo-shoreline is the distributed area of Triassic oil and gas fields; 4) slopes along two sides of paleo-channels (paleo-drainage systems) are the favor area for the exploration of Jurassic oil and gas pools;5) paleo-central uplift is the tectonic background for the forming of Paleozoic giant gas fields ,paleo-nose highs with permeable sandstone are the rich areas of giant gas fields. The further exploration in the basin should give rein to the use of high resolution seismic,and develop the new techniques of horizontal well,deflecting well,cluster well,acidizing and fracturing. Additionally,the mapping of thin bed lithofacies paleogeographic maps of Triassic and Jurassic,and the study of paleo-shoreline and paleo-channel will be necessary to understand the distributed characteristics of oil-gas fields and increase exploration benefit.
出处
《中国海上油气（地质）》
1999年第6期391-395,共5页
China Offshore Oil and Gas(Geology)
