四川盆地震旦系灯影组古岩溶地貌恢复及意义  

Restoration of paleokarst geomorphology of Sinian Dengying Formation in Sichuan Basin and its significance, SW China

作　　者：刘宏[1,2,3] 罗思聪[1,2,3] 谭秀成 李凌 连承波 曾伟 罗冰[5] 山述娇[5] 

机构地区：[1]四川省天然气地质重点实验室 [2]西南石油大学地球科学与技术学院 [3]中国石油碳酸盐岩储集层重点实验室沉积与成藏分室 [4]油气藏地质及开发工程国家重点实验室 [5]中国石油西南油气田公司勘探开发研究院

出　　处：《石油勘探与开发》2015年第3期283-293,共11页Petroleum Exploration and Development

基　　金：国家自然科学基金(41402126);国家科技重大专项(2011ZX05004-005-03)

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。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 paleoAand in the west, Songpan pateo-land in the northwest, Harman 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 Chongqing- Kaixian 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.

关 键 词：古地貌恢复 印模法 风化壳岩溶 岩溶储集层 古地理格局 震旦系灯影组 四川盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探]