上揚子克拉通內(nèi)裂陷的發(fā)現(xiàn)及對安岳特大型氣田形成的控制作用
[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.
【作者單位】: 中國石油勘探與生產(chǎn)分公司;中國石油勘探開發(fā)研究院;中國石油西南油氣田公司;
【基金】:中國石油天然氣集團公司勘探與生產(chǎn)專項“四川盆地樂山—龍女寺古隆起震旦系含油氣評價及勘探配套技術(shù)研究” 國家重大科技專項(2011ZX05004)資助
【分類號】:P618.13
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