本文選題：四川盆地 + 深層-超深層�。� 參考：《巖石學(xué)報(bào)》2017年04期

【摘要】：綿陽(yáng)-長(zhǎng)寧拉張槽的發(fā)現(xiàn),大大地提升了四川疊合盆地西部深層-超深層海相層系的油氣勘探前景。本文利用鉆井、地震和野外露頭資料和前人研究成果系統(tǒng)分析川西深層-超深層油氣地質(zhì)條件和目前發(fā)現(xiàn)的雷口坡組氣藏的成藏過(guò)程。結(jié)果表明,四川疊合盆地西部深層-超深層海相層系有以下寒武統(tǒng)為主的多源供烴系統(tǒng),多時(shí)代(震旦系燈影組白云巖,二疊系白云巖和礁灘體,三疊系雷口坡組微生物巖和顆粒白云巖等)儲(chǔ)集層疊合,致密碳酸鹽巖、巨厚陸相泥質(zhì)巖和中下三疊統(tǒng)膏鹽巖多級(jí)封蓋,以斷裂(及不整合面)和優(yōu)質(zhì)儲(chǔ)層構(gòu)成的立體輸導(dǎo)網(wǎng)絡(luò)等,使得深層-超深層海相層系具備形成大氣田的基本條件,是原生氣藏和次生氣藏共存的天然氣富集區(qū)。近年來(lái),川西發(fā)現(xiàn)的中三疊統(tǒng)雷口坡組四段氣藏,其可能成藏過(guò)程為生烴中心(下寒武統(tǒng)烴源巖等)→生氣中心(燈影組和二疊系古油藏等)→儲(chǔ)氣中心(燈影組和二疊系古氣藏等)→保氣中心(雷口坡組次生氣藏)。這揭示其深層-超深層既可能還存在著符合四中心耦合成藏的原生氣藏,也可能發(fā)育著次生氣藏,極有可能發(fā)現(xiàn)新的大氣田。
[Abstract]:The discovery of the Mianyang-Changning extensional trough has greatly enhanced the prospects of oil and gas exploration in the deep-to ultra-deep marine strata in the western Sichuan superimposed basin. Based on drilling, seismic and outcrop data and previous research results, this paper systematically analyzes the geological conditions of deep and ultra-deep oil and gas in western Sichuan and the reservoir formation process of Leikoupo formation discovered at present. The results show that the deep-ultra-deep marine strata in the western Sichuan superimposed basin have the following Cambrian multi-source hydrocarbon supply systems, multi-epoch (Sinian Dengying formation dolomite, Permian dolomite and reef body). Triassic Lekoupo formation microbe rock and granulated dolomite, etc.) the reservoir is stratified, tight carbonate rock, superthick continental argillaceous rock and middle and lower Triassic gypsum salt rock multistage seal cap. The three-dimensional transport network composed of faults (and unconformities) and high quality reservoirs makes the deep-ultra-deep marine facies series have the basic conditions for forming large gas fields and is a natural gas accumulation area where primary gas reservoirs and secondary gas reservoirs coexist. In recent years, the fourth member of the Leikoupo formation of the Middle Triassic has been discovered in western Sichuan. The gas storage center (Dengying formation and Permian paleo-reservoir, etc.) and the secondary gas storage center (Leikoupo formation, etc.) during the process of reservoir formation may generate hydrocarbon (Lower Cambrian source rock, etc.). This indicates that the deep to ultra deep layer may also have primary gas reservoirs which are in accordance with the coupling of four centers, or may develop secondary gas reservoirs, so it is very possible to find new atmospheric fields.
【作者單位】： 油氣藏地質(zhì)及開(kāi)發(fā)工程國(guó)家重點(diǎn)實(shí)驗(yàn)室成都理工大學(xué);
【基金】：國(guó)家自然科學(xué)重點(diǎn)基金項(xiàng)目(41230313) 中國(guó)地質(zhì)調(diào)查局項(xiàng)目(121201021000150009)聯(lián)合資助
【分類號(hào)】：P618.13

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