陕甘宁盆地构造——沉积演化及其对油气资源的控制

陕甘宁盆地是华北陆块西部大型沉积盆地,其西缘,南缘均为中国大陆板块内部重要的地质分界线,由于古生代一中、新生代以来华北陆块与其相邻的各构造单元之间的拼贴作用,致使盆地内先后经历了至少四期迭加的构造活动,它们是1)早—中元古代的北北东向构造;2)古生代—中三迭世的近东西向构造;3)晚三迭世的近南北向构造和4)中侏罗世以来的整体掀斜构造。这四期构造活动依次迭加、改造,控制了不同时代和地区油气的生成、迁移和聚集条件。对这些条件的正确认识,将对区内油气资源的勘探和开发具有重要意义。

STRUCTURE-SEDIMENTATION EVOLUTION OF SHAANGAN-NING BASIN AND ITS CONTROL OF OIL AND GAS IN THE AREA

Shaan-Gan-Ning basin is a large sedimentary basin in the west margin of north China continental crust. Its west and south boundaries are important geological and structural lines in China plate. The rock formation in the basin underwent at least four phase structural deformations which were superimposed in proper order: 1) The NNE-SSW structure in lower-middle proterozoic era; 2) The east-west structure in palaeozoic-middle triassic epoch; 3) The north-south structure in upper triassic epoch and, 4) The whole tilting structure after middle jurassic epoch. These structures developed because of juxtaposision of north China continental crust and its adjoining structural units after palaeozoic era. @These structural deformations which superimposed in proper order are in control of the conditions of formation, migration and gathering of oil and gas under the area. Correct understanding of these conditions is of great significance for oil and gas prospecting and developing in the area. Shaan-Gan-Ning basin, geological structure, sedimentation, oiigas control.