本文選題：古地貌恢復(fù)　切入點：印模法　出處：《西南石油大學(xué)》2015年碩士論文

【摘要】：震旦系燈影組碳酸鹽巖是四川盆地重要的天然氣產(chǎn)層,磨溪—高石梯氣田的發(fā)現(xiàn)再次證明了四川盆地?zé)粲敖M具有巨大的勘探潛力。受桐灣運動的影響,燈影組內(nèi)部和頂部遭受過風(fēng)化剝蝕和大氣淡水淋濾作用,目前研究認為疊合風(fēng)化殼巖溶改造的丘—灘相碳酸鹽巖是區(qū)內(nèi)燈影組優(yōu)質(zhì)儲層形成的主要原因,而有利儲層的發(fā)育部位受到古巖溶地貌的控制。因此開展碳酸鹽巖風(fēng)化殼巖溶古地貌的恢復(fù)及其巖溶儲層特征的研究對于尋找碳酸鹽巖油氣藏具有重要的指導(dǎo)意義。應(yīng)用川中高石梯地區(qū)新鉆井資料,以及四川盆地及周緣150余條野外露頭剖面資料和30余口鉆井的地層劃分及對比結(jié)果,結(jié)合區(qū)域地震資料,采用“印模法”恢復(fù)震旦系燈影組古巖溶地貌,并在此基礎(chǔ)上研究其古地理格局及油氣勘探意義。燈影末期—早寒武世四川盆地周緣為古陸/水下高地環(huán)抱,具體包括西部的康滇古陸、西北部的松潘古陸、北部的漢南古陸、東南和東北部的黔江—正安、鎮(zhèn)巴及巫溪—建始水下高地。盆地向東南和東北分別接入江南盆地和秦嶺洋。在盆地內(nèi)部,受南北向梓潼—筠連裂陷槽以及北東向閬中—通江、重慶—開縣坳陷分隔的影響,南北向存在“三隆”(鎮(zhèn)巴、川中、黔江—正安)“兩坳”(閬中—通江、重慶—開縣),而東西向被分隔為相對獨立的兩個古隆起體系：南北向的綿陽—樂山—西昌古隆起、近北東向的川中古隆起。燈影組古巖溶地貌控制了區(qū)內(nèi)的古巖溶地貌格局,形成了巖溶高地、臺地、斜坡、洼地和盆地5個二級巖溶地貌單元,其中巖溶臺地和斜坡為巖溶型儲集層發(fā)育區(qū),為大型氣田的形成提供了有利條件。
[Abstract]:The carbonate rock of the Dengying formation of Sinian system is an important natural gas producing layer in Sichuan basin. The discovery of Moxi Gaoshiti gas field proves once again that the Dengying formation in Sichuan Basin has great exploration potential, which is influenced by the Tongwan movement. The Dengying formation was weathered and denudated inside and at the top of the formation and the atmospheric fresh water was leached. At present, it is considered that the main reason for the formation of the high quality reservoir of the Dengying formation is the hump-beach carbonate rock reformed by the superimposed weathering crust. The development of favorable reservoir is controlled by paleokarst geomorphology, so it is important to study the recovery of karst paleogeomorphology in carbonate weathering crust and the characteristics of karst reservoir for finding carbonate reservoir. Application of new drilling data in Gaoshi area, central Sichuan, In addition, more than 150 outcrop profiles of Sichuan Basin and its periphery, stratigraphic division and correlation of more than 30 drilling wells, combined with regional seismic data, are used to restore paleokarst geomorphology of Dengying formation of Sinian system by "impression method". On this basis, the paleogeographic pattern and the significance of oil and gas exploration are studied. The margin of Sichuan basin from late Dengying to early Cambrian is surrounded by ancient land / underwater highlands, including Kangdian ancient land in the west, Songpan ancient land in the northwest, and Hannan ancient land in the north. Southeast and northeast Qianjiang-Zhengan, Zhenba and Wuxi-Jianshi underwater highlands. The basin flows southeast and northeast into the Jiangnan basin and Qinling ocean respectively. In the interior of the basin, it is subjected to the south-north Zitong-Junlian rift trough and the north-east Langzhong-Tongjiang river. The influence of the separation in Chongqing-Kaixian depression, the "Sanlong" (Zhenba, Chuanzhong, Qianjiang-Zhengan) "two depressions" (Langzhong-Tongjiang) exists in the south-north direction. The east-west direction is separated into two relatively independent paleouplift systems: the south-north Mianyang Leshan Xichang uplift and the north-eastward central Sichuan uplift. The paleokarst geomorphology of the Dengying formation controls the paleokarst geomorphological pattern in the region. The karst plateau, platform, slope, depression and basin are five secondary karst geomorphologic units, among which karst platform and slope are karst reservoir development areas, which provide favorable conditions for the formation of large gas fields.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13;P531

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