【摘要】：利用鉆井和地震資料,在上揚子克拉通德陽—安岳地區(qū)發(fā)現(xiàn)晚震旦世—早寒武世克拉通內(nèi)裂陷,受張性斷裂控制,呈NNW向展布,南北長320km、東西寬50~300km。裂陷演化經(jīng)歷了形成期、發(fā)展期、消亡期3個階段,形成有利的近源成藏組合。研究結(jié)果表明:1晚震旦世燈影組沉積期為裂陷形成期,裂陷內(nèi)發(fā)育槽盆相沉積,兩側(cè)發(fā)育臺地邊緣相丘灘體,控制了燈影組優(yōu)質(zhì)儲層的形成與分布;2早寒武世梅樹村組沉積期—筇竹寺組沉積期為裂陷發(fā)展期,充填500~1 000 m的深水陸棚相泥質(zhì)巖,是優(yōu)質(zhì)烴源巖沉積期;3滄浪鋪組沉積期為裂陷消亡期,經(jīng)填平補齊,結(jié)束了克拉通內(nèi)裂陷的演化歷史。克拉通內(nèi)裂陷是安岳特大型氣田形成的關鍵因素,裂陷內(nèi)優(yōu)質(zhì)烴源巖為特大型氣田提供了充足的氣源,在晚燕山期—喜馬拉雅期川中古隆起西部快速隆升過程中形成區(qū)域性側(cè)向封堵,有利于裂陷東翼的高石梯—磨溪地區(qū)特大型氣田的保存。克拉通內(nèi)裂陷及其大氣田成藏作用對古老克拉通盆地深層油氣勘探有重要的參考價值。
[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研究” 國家重大科技專項(2011ZX05004)資助
【分類號】：P618.13

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