【摘要】 应用川中高石梯地区新钻井资料,以及四川盆地及周缘150余条野外露头剖面资料和30余口钻井的地层划分及对比结果,结合区域地震资料,采用"印模法"恢复震旦系灯影组古岩溶地貌,并在此基础上研究其古地理格局及油气勘探意义。灯影组沉积期末四川盆地周缘为古陆/水下高地环抱,具体包括西部的康滇古陆、西北部的松潘古陆、北部的汉南古陆、东南和东北部的黔江—正安、镇巴及巫溪—建始水下高地。盆地向东南和东北分别接入江南盆地和古秦岭洋。在盆地内部,受南北向梓潼—筠连裂陷槽以及北东向阆中—通江、重庆—开县坳陷分隔的影响,南北向存在"三隆"(镇巴、川中、黔江—正安)"两坳"(阆中—通江、重庆—开县),而东西向被分隔为相对独立的两个古隆起体系:南北向的绵阳—乐山—西昌古隆起、近北东向的川中古隆起。灯影组古岩溶地貌控制了区内的古岩溶地貌格局,形成了岩溶高地、台地、斜坡、洼地和盆地5个二级岩溶地貌单元,其中岩溶台地和斜坡为岩溶型储集层发育区,为大型气田的形成提供了有利条件。更多还原

【Abstract】 Based on newly drilled well data in the Gaoshiti area in the central Sichuan Basin, profile data of more than 150 field outcrops of the regional geological survey, and stratigraphic division and correlation of more than 30 wells in the Sichuan Basin and its adjacent areas, combined with regional seismic data, moldic methods are comprehensively used to restore the karst paleogeomorphy of the Dengying Formation, and thus studying the paleogeographic pattern and the significance of oil and gas exploration. The Sichuan Basin was surrounded by paleo-lands/underwater highlands in the late Sininan Dengying period, including Kangdian paleo-land in the west, Songpan paleo-land in the northwest, Hannan paleo-land in the north, Qianjiang-Zheng’an, Zhenba and Wuxi-Jianshi underwater highlands in the southeast and northeast. The Sichuan Basin was adjacent to Jiangnan Basin southeastwards and Qinling paleo-ocean northeastwards respectively. Affected by the separation of NS-striking Zitong-Junlian Aulacogen, NE-striking Langzhong-Tongjiang and ChongqingKaixian depressions in this basin, the Sichuan Basin presents the NS-trending framework of "three uplifts(Zhenba, Chuanzhong and Qianjiang-Zheng’an) and two depressions(Langzhong-Tongjiang and Chongqing-Kaixian)", and is divided into two relatively isolated EW-trending paleo-uplift systems(NS-striking Mianyang-Leshan-Xichang paleo-uplift and nearly NE-striking Chuanzhong paleo-uplift). Controlled by karst paleogeomorphy of the Sinian Dengying Formation, the pattern of karst landscape consists of five secondary geomorphic units, such as karst highland, karst platform, karst slope, karst depression and karst basin, of which the karst platform and karst slope are the favorable zones for the development of karst reservoirs, providing advantages for the formation of large gas fields.更多还原