上扬子克拉通内裂陷的发现及对安岳特大型气田形成的控制作用

发布时间：2018-11-01 11:03

【摘要】：利用钻井和地震资料,在上扬子克拉通德阳—安岳地区发现晚震旦世—早寒武世克拉通内裂陷,受张性断裂控制,呈NNW向展布,南北长320km、东西宽50~300km。裂陷演化经历了形成期、发展期、消亡期3个阶段,形成有利的近源成藏组合。研究结果表明:1晚震旦世灯影组沉积期为裂陷形成期,裂陷内发育槽盆相沉积,两侧发育台地边缘相丘滩体,控制了灯影组优质储层的形成与分布;2早寒武世梅树村组沉积期—筇竹寺组沉积期为裂陷发展期,充填500~1 000 m的深水陆棚相泥质岩,是优质烃源岩沉积期;3沧浪铺组沉积期为裂陷消亡期,经填平补齐,结束了克拉通内裂陷的演化历史。克拉通内裂陷是安岳特大型气田形成的关键因素,裂陷内优质烃源岩为特大型气田提供了充足的气源,在晚燕山期—喜马拉雅期川中古隆起西部快速隆升过程中形成区域性侧向封堵,有利于裂陷东翼的高石梯—磨溪地区特大型气田的保存。克拉通内裂陷及其大气田成藏作用对古老克拉通盆地深层油气勘探有重要的参考价值。
[Abstract]:Using drilling and seismic data, the late Sinian to early Cambrian craton inner rift was found in Deyang-Anyue area of upper Yangtze craton, controlled by extensional faults, distributed in NNW direction, 320 km in length from north to south, and 50 to 300 km in width from east to west. The rift evolution has experienced three stages: formative stage, developing stage and dying out stage, forming favorable near-source accumulation assemblage. The results show that: 1 the depositional period of Dengying formation in late Sinian is rifting forming period, the trough basin facies is developed in the rift, and the terrace margin facies hilly body is developed on both sides, which controls the formation and distribution of high quality reservoir of Dengying formation; (2) the sedimentary epoch of the early Cambrian Meishucun formation and Qiongzhusi formation is a rift development period, filling 500 ~ 1 000 m deep water shelf facies argillaceous rock, which is the sedimentary period of high quality hydrocarbon source rock; (3) the sedimentary period of Canglangpu formation is rifting and wiping out, which ends the evolution history of craton inner rift. The craton inner rift is the key factor in the formation of Anyue super large gas field, and the high quality hydrocarbon source rock in the rift provides sufficient gas source for the super large gas field. The formation of regional lateral sealing during the rapid uplift in the western part of the mid-ancient Sichuan uplift during the late Yanshanian and Himalayan periods is beneficial to the preservation of the super large gas fields in the Gaoshitian-Moxi area on the eastern flank of the rift. The cratonic rift and its reservoir formation in large gas fields have important reference value for deep oil and gas exploration in the ancient craton basin.
【作者单位】：中国石油勘探与生产分公司;中国石油勘探开发研究院;中国石油西南油气田公司;
【基金】：中国石油天然气集团公司勘探与生产专项“四川盆地乐山—龙女寺古隆起震旦系含油气评价及勘探配套技术研究” 国家重大科技专项(2011ZX05004)资助
【分类号】：P618.13

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