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通过多种地质资料研究,基于四川盆地东部地区3方面依据,提出该区发育前震旦纪—早寒武世宣汉—开江大型继承性古隆起:1地震显示震旦系灯影组、下寒武统由周缘向宣汉—开江地区超覆沉积;2灯影组厚度显示宣汉—开江地区最薄,向周围增厚;3城口、巫溪等露头灯影组发育碎屑岩间接指示古隆起的发育。通过对古隆起的发育特征、形成演化分析,发现古隆起平面近穹窿状、南北向延伸,面积约1.6′104 km2;纵向划分为核部平台区、西侧陡坡带与东侧缓坡带3部分;晚震旦世早期为水上剥蚀型古隆起,晚震旦世晚期—早寒武世转为水下沉积型古隆起,形成受基底隆升、克拉通内裂陷、基底断裂与区域抬升运动联合控制。古隆起及斜坡区有利于高能沉积相带与岩溶风化壳储集层的发育,是川东地区近期重要战略接替勘探领域。
Based on the data of three kinds of geological data in the eastern area of Sichuan Basin, the paper presents the pre-Sinian-Precambrian Xuanhan-Kaijiang large-scale inherited ancient uplift in this area: an earthquake shows that the Sinian Dengying Formation and the Lower Cambrian From the periphery to the Xuanhan-Kaijiang area overlying the sediments; 2 Dengxu thickness shows Xuanhan - Kaijiang area the thinnest, to the surrounding thickening; 3 Chengkou, Wuxi Creek et al. Development. By analyzing the evolution and evolution of the paleo-uplift, the paleo-uplift was found nearly dome-shaped and extended in the north-south direction with an area of about 1.6’104 km2. The paleo-uplift was divided into three parts: the core platform, the steep slope on the west and the gentle slope on the east In the late Neo-Sinian, the hydro-erosion paleohigh uplift, from late Sinian to early Cambrian to sub-sea sedimentary paleohigh uplift, which was affected by basal uplift, craton pass, basement rupture and regional uplift Joint control. Paleoproterozoic and slope areas are favorable for the development of high-energy sedimentary facies and karst weathered crust reservoirs, and are important successional exploration successions in eastern Sichuan.