Inclined eastward and consisting of the Hetianhe, Hetianhedong, Tazhong paleouplifts and Bachu paleoslope, the central paleouplift belt in the Tarim Basin was a large composite paleouplift and paleoslope belt with com...Inclined eastward and consisting of the Hetianhe, Hetianhedong, Tazhong paleouplifts and Bachu paleoslope, the central paleouplift belt in the Tarim Basin was a large composite paleouplift and paleoslope belt with complicated palaeogeomorphic features during the Middle to early Late Ordovician. A number of paleostructural geomorphic elements have been identified in the paleouplift belt and surrounding areas, such as the high uplift belts, the faulted uplift platforms, the marginal slopes and slope break zones flanking the paleouplift belt, the surrounding shelf slopes or low relief ramps, the shelf slope break zones and deep basin plains. They exerted great influence on the development of paleogeography of the basin. The marginal slopes and slope break zones flanking the uplift belt constrained the formation and deposition of the high-energy facies including reefal and shoal deposits during the Late Ordovician, which comprise the major reservoirs of the Lower Paleozoic in the basin. Toward the end of the Ordovician, the Tazhong paleouplift hinged westward and became a westward-dipped nose as the southeastern margin of the basin was strongly compressed and uplifted. The tectono-paleogeomorphic framework of the central northern basin during the Early Silurian and the Late Devonian to Early Carboniferous changed remarkably in topography from the initial low in east and high in west to high in northeast and low in southwest. The major paleogeomorphic elements developed in these periods included the strong eroded uplift high, the uplift marginal slope, the gentle ramp of the depression margin and the depression belt. The sandstones of the lowstand and the early transgressive systems tracts were deposited along the uplift marginal slopes and the gentle ramps of the depressions comprise the prolific reservoirs in the basin. The study indicates that the distribution patterns of the unconformities within the basin are closely related to the paleogeomorphic features and evolution of the paleouplift belt. From the high upli展开更多
针对四川盆地川中古隆起高磨三维区震旦系-古生界二叠系海相碳酸盐岩层系不同尺度的断裂,特别是小型走滑断裂在地震资料上难以识别和解释的难点,利用地震数据及其属性携带的断裂结构信息、不连续性变化信息、裂缝带信息,优选应用构造导...针对四川盆地川中古隆起高磨三维区震旦系-古生界二叠系海相碳酸盐岩层系不同尺度的断裂,特别是小型走滑断裂在地震资料上难以识别和解释的难点,利用地震数据及其属性携带的断裂结构信息、不连续性变化信息、裂缝带信息,优选应用构造导向滤波技术、本征值相干技术、分频相干与分方位相干技术、最大正/负曲率属性技术、蚂蚁体技术、最大似然断裂识别技术、PADD(poststack amplitude direction decomposition,叠后振幅方位分解)技术,分层系、分方位、分尺度逐级精细识别和描述了地震波同相轴错断型断裂、同相轴挠曲型断裂、裂缝型微小断裂,以及岩溶塌陷体,并应用成像测井裂缝信息定性验证不同尺度断裂方位和断裂密度,井震吻合效果好.集成形成“三分八步”逐级控制下的断裂地震识别技术方法系列.并根据地质模型和断裂模式判别了走滑断裂,进行了分级,总结了川中高磨区6种走滑断裂构造样式.展开更多
基金National Basic Research Program of China (Grant No. 2006CB202302)National Natural Science Foundation of China (Grant No. 40372056)Frontier Research Project of Marine Facies
文摘Inclined eastward and consisting of the Hetianhe, Hetianhedong, Tazhong paleouplifts and Bachu paleoslope, the central paleouplift belt in the Tarim Basin was a large composite paleouplift and paleoslope belt with complicated palaeogeomorphic features during the Middle to early Late Ordovician. A number of paleostructural geomorphic elements have been identified in the paleouplift belt and surrounding areas, such as the high uplift belts, the faulted uplift platforms, the marginal slopes and slope break zones flanking the paleouplift belt, the surrounding shelf slopes or low relief ramps, the shelf slope break zones and deep basin plains. They exerted great influence on the development of paleogeography of the basin. The marginal slopes and slope break zones flanking the uplift belt constrained the formation and deposition of the high-energy facies including reefal and shoal deposits during the Late Ordovician, which comprise the major reservoirs of the Lower Paleozoic in the basin. Toward the end of the Ordovician, the Tazhong paleouplift hinged westward and became a westward-dipped nose as the southeastern margin of the basin was strongly compressed and uplifted. The tectono-paleogeomorphic framework of the central northern basin during the Early Silurian and the Late Devonian to Early Carboniferous changed remarkably in topography from the initial low in east and high in west to high in northeast and low in southwest. The major paleogeomorphic elements developed in these periods included the strong eroded uplift high, the uplift marginal slope, the gentle ramp of the depression margin and the depression belt. The sandstones of the lowstand and the early transgressive systems tracts were deposited along the uplift marginal slopes and the gentle ramps of the depressions comprise the prolific reservoirs in the basin. The study indicates that the distribution patterns of the unconformities within the basin are closely related to the paleogeomorphic features and evolution of the paleouplift belt. From the high upli
文摘针对四川盆地川中古隆起高磨三维区震旦系-古生界二叠系海相碳酸盐岩层系不同尺度的断裂,特别是小型走滑断裂在地震资料上难以识别和解释的难点,利用地震数据及其属性携带的断裂结构信息、不连续性变化信息、裂缝带信息,优选应用构造导向滤波技术、本征值相干技术、分频相干与分方位相干技术、最大正/负曲率属性技术、蚂蚁体技术、最大似然断裂识别技术、PADD(poststack amplitude direction decomposition,叠后振幅方位分解)技术,分层系、分方位、分尺度逐级精细识别和描述了地震波同相轴错断型断裂、同相轴挠曲型断裂、裂缝型微小断裂,以及岩溶塌陷体,并应用成像测井裂缝信息定性验证不同尺度断裂方位和断裂密度,井震吻合效果好.集成形成“三分八步”逐级控制下的断裂地震识别技术方法系列.并根据地质模型和断裂模式判别了走滑断裂,进行了分级,总结了川中高磨区6种走滑断裂构造样式.
