雪峰山西侧地区构造形变与油气圈闭  

A discussion on the structural deformation and oil/gas traps on the western side of the Xuefeng Mountain

作　　者：王宗秀[1] 张进[2] 关会梅[1] 汤良杰[3] 肖伟峰[1] 鄢犀利[1] 

机构地区：[1]中国地质科学院地质力学研究所/页岩油气调查评价重点实验室,北京100081 [2]中国地质科学院地质研究所,北京100037 [3]中国石油大学,北京102249

出　　处：《地质通报》2012年第11期1812-1825,共14页Geological Bulletin of China

基　　金：中国地质调查局地质调查项目<雪峰山西侧地区海相油气地质调查及综合研究>(编号:1212010782003);国土资源部公益性行业科研专项<华夏-扬子板块结合带北东段的形成与破坏及其成矿作用>(编号:200811015)

摘　　要：滑脱构造广泛存在于地壳形变过程中,也是盆山结合带一种重要和常见的变形机制。雪峰山西侧地区发育的一系列"隔档-隔槽式"褶皱为多层次滑脱控制下变形的结果,双冲构造是本区的重要变形方式,也是区别典型滑脱褶皱构造的重要特征。由于滑脱系统变形的相对独立性,以及各个滑脱层在剪切运动过程中变形量、变形规模、变形强度、缩短量等的不同,必定造成地貌高点与深部构造高点之间不一定存在吻合的对应关系。通过系统的变形构造解析,结合油气勘探实例,提出雪峰山西侧地区存在滑脱冲断圈闭、滑脱褶皱圈闭、断坡遮挡圈闭、滑脱层圈闭4种可能的油气构造圈闭形式。雪峰山西侧深部滑脱层变形、展布等的精细研究,应是南方海相油气勘探和优选区圈定的重要工作内容之一。Detachment structures occur widely in the crust, and also constitute an important and common deformation in the area between the orogenic belt and the basin. The＂comb-like＂ and ＂tough-like＂fold belts on the western side of the Xuefeng Mountain result from the multi-layer detachment, and their formation is different from the typical Jura type structures. The reason is that there are several detachment layers and detachment systems in the stratigraphic column from the Neoproterozoic upwards to the Mesozoic in the study area. The structural analysis shows that every detachment system was a relatively independent deformation unit during the multi-layer detachment. In this paper, a model of multi-layer detachment in the study area is set up, and the factors controlling the development of the ＂comb-like＂ and ＂tough-like＂fold belts are described. Because there are several detachment layers, the duplex structure is the important deformation style in the area. These are important characteristics different from the typical Jura type structures. Due to the duplex structures, most of topographical heights in the area do not correspond to the structure heights in the depth. In addition, the detachment layers may be effective tunnels for the oil/gas migration, which could shed light on the study of the hydrocarbon migration and accumulation. Based on the deformation styles and assemblages in the area, the authors hold that four types of structural traps could resuh frcom the multi-layer detachment and thrust deformation, i.e., the detachment and thrust trap, the detachment folding trap, the fault-flat blocking trap and the detachment layer trap. The potential targets for the marine petroleum exploration in the ＂comb-like＂ and ＂tough-like＂ fold belts are also discussed.

关 键 词：雪峰山 多层次滑脱 变形 滑脱-冲断 构造圈闭 

分 类 号：P618.130.2[天文地球—矿床学]