本文關鍵詞： 四川盆地 川東北地區(qū) 萬源—達州 震旦紀—早寒武世 克拉通內裂陷 巖相古地理 構造運動　出處：《石油勘探與開發(fā)》2017年05期 　論文類型：期刊論文

【摘要】：隨四川盆地震旦系—寒武系天然氣勘探的深入,地質認識不斷創(chuàng)新,在川東北地區(qū)萬源—達州發(fā)現了一近北東向展布的克拉通內裂陷。利用地震、野外露頭資料,結合盆地區(qū)域構造背景分析,勾繪了萬源—達州內裂陷的邊界與空間展布,梳理了裂陷演化及其理論與勘探意義。研究揭示:(1)震旦系燈一、二段在地震剖面上有明顯的"陡坎"帶,顯示臺地邊緣相帶的存在,總體呈近北東向展布;(2)裂陷周緣燈影組一、二段較厚,燈影組三、四段較薄,裂陷內部燈影組一、二段較薄,燈影組三、四段較厚;(3)裂陷演化分為震旦紀燈一段—燈二段沉積期的形成階段、燈三段—燈四段沉積期的充填與沉降階段以及早寒武世麥地坪組—筇竹寺組沉積期的萎縮—消亡3個階段,其形成受早期南華紀裂谷及區(qū)域性隆升聯(lián)合控制。萬源—達州克拉通內裂陷的發(fā)現改變了四川盆地震旦紀—早寒武世構造沉積格局的傳統(tǒng)認識,該裂陷周緣震旦系天然氣成藏條件有利,是今后的重要勘探方向。
[Abstract]:With the further exploration of natural gas from Sinian to Cambrian in Sichuan Basin, geological knowledge has been innovated constantly, and a cratonic inner rift has been discovered in Wanyuan-Dazhou, northeast Sichuan. Using earthquake and outcrop data, Based on the analysis of the regional tectonic background of the basin, the boundary and space distribution of the Wanyuan-Dazhou rift is drawn, and the evolution of the rift and its theoretical and exploration significance are combed. There are obvious "steep ridges" in the seismic section of the second member, which shows the existence of the platform margin facies belt, which is generally near NE direction. The Dengying formation around the rifting margin is 1, the second stage is thicker, the third and fourth sections of the Dengying formation are thin, and the inner Dengying formation is one. The rift evolution of the thin Dengying formation and the third and fourth member of Dengying formation can be divided into the forming stage of the deposit period of the first and second member of the Landian formation in the Sinian. The filling and subsidence stages of the deposit period of the third and fourth member of the Lantern formation and the atrophy and extinction of the early Cambrian Madiping formation and Qiongzhusi formation. Its formation is controlled by the early South China rift and regional uplift. The discovery of Wanyuan-Dazhou craton rift has changed the traditional understanding of the Sinian to early Cambrian tectonic sedimentary pattern in Sichuan Basin. It is an important exploration direction in the future because of favorable reservoir forming conditions of Sinian gas in the margin of the rift.
【作者單位】： 中國石油勘探開發(fā)研究院;
【基金】：國家科技重大專項(2016ZX05007)
【分類號】：P618.13

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