摘要
通过对研究区已有重、磁测量资料的整理和研究,结合钻井、地质、电法及地震等成果,讨论了重磁异常分布特征,具此推断断裂构造,划分研究区的构造单元,预测油页岩有利区。研究结果表明,鄂尔多斯盆地渭北隆起地重磁场具有"东高西低、中间高南北低、高低相间"的基本特征;主断裂呈北东向展布,近东西向和北西向等次级断裂切断了主断裂,形成了"多"字形分布的构造特征;根据重磁场特征在南北向和东西向上的显著差异,渭北隆起带可划分为宜君-黄龙断坡带、土桥-照金断褶带、彬县-灵台褶皱带、麟游-永寿褶皱带、耀县-澄城断褶带和合阳-澄城断隆带6个构造单元。宜君-黄龙断坡带和耀县-澄城断褶带三叠系面积广、分布稳定、沉积厚度大、烃源岩丰富,是寻找三叠系延长组油页岩层勘探目标的有利带。
This paper neatened and studied the gravity and magnetic measurement data in the study area. It used these data in combination with drilling, geological, electrical and seisimic results in the study area.The distribution of gravity and magnetic anomalies have been discussed, the faulting structures have been speculated, the tectonic units of the study area have been divided and the favourable areas for oil shale have also been predicted.The results showed that gravity and magnetic fields have the following basic features: “high in the east and low in the west, high in the center and low in the south and the north, the high and the low are alternated”.The main fault of the study area is NE-trending .Nearly EW and NW-trending secondary faults cut off the main fault, forming “多”-shaped tectonic features.According to significant differences on north-south and east-west, Weibei uplift can be divided into 6 tectonic units, such as Yijun-Huanglong ramp zone, Tuqiao-Zhaojin fault fold belt, Bin coun-ty-Lingtai fold belt, Linyou-Yong shou fold belt, Yao county-Chengcheng fault-fold belt, Heyang-Chengcheng fault-uplift belt. Trissic in Yi jun-Huanglong ramp zone and Yao county-Chengcheng fault-fold belt has wide area, distributional stability, large sedimentary thickness and hydrocarbin source rocks. They may be favourable explo-ration target zones for Triassic Yanchang Formation in the study area.
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2015年第6期114-120,共7页
Coal Geology & Exploration
基金
中国地质调查局资源调查与评价项目(12120113040300-03)
陕西省教育厅专项科研计划项目(14KJ1579)
西安石油大学研究生创新基金项目(2014cx130220)
关键词
油页岩有利区
断裂构造
重磁场特征
渭北隆起
鄂尔多斯盆地
favourable areas for oil shale
faulting structure
gravity and magnetic field features
Weibei uplift
Ordos basin
