【摘要】：中二疊統(tǒng)海相碳酸鹽巖地層是四川盆地重要的天然氣產(chǎn)層,勘探潛力巨大,但對(duì)其層狀白云巖儲(chǔ)層賦存相帶及其分布情況等的認(rèn)識(shí)尚不清楚,影響了天然氣勘探的進(jìn)程。為此,基于四川盆地沉積背景,以層序地層格架下有利儲(chǔ)集層段為重點(diǎn)研究單元,通過(guò)對(duì)野外露頭剖面、鉆井資料和地震資料的綜合分析,在巖相古地理方面取得以下研究成果:①中二疊統(tǒng)棲霞組沉積時(shí)總體表現(xiàn)為西南高、北東低的緩坡背景,而中二疊統(tǒng)茅口組在此背景上疊加了一系列北西向展布的臺(tái)內(nèi)裂陷,演變成向北東傾斜的隆洼相間的古地理格局:②棲霞組海侵域?yàn)殚_(kāi)闊臺(tái)地環(huán)境,高位域演化成鑲邊臺(tái)地,劍閣一雅安地區(qū)的臺(tái)地邊緣灘為有利儲(chǔ)集相帶;③茅口組海侵域?yàn)樘妓猁}巖陸棚環(huán)境,高位域演化為鑲邊臺(tái)地,劍閣—雅安地區(qū)的臺(tái)地邊緣(礁)灘和鹽亭—廣安地區(qū)的臺(tái)洼邊緣灘為有利儲(chǔ)集相帶。結(jié)論認(rèn)為:劍閣—雅安地區(qū)和鹽亭—廣安地區(qū)兩條高能顆粒灘帶是該盆地中二疊統(tǒng)層狀白云巖儲(chǔ)層規(guī)模發(fā)育的有利區(qū)帶,是下一步天然氣勘探的主攻方向。
[Abstract]:The middle Permian marine carbonate formation is an important natural gas producing layer in Sichuan basin, and the exploration potential is great. However, the understanding of the facies belt and its distribution of the stratified dolomite reservoir is not clear, which affects the process of natural gas exploration. Therefore, based on the sedimentary background of Sichuan Basin and taking the favorable reservoir section under sequence stratigraphic framework as the key research unit, the field outcrop profile, drilling data and seismic data are comprehensively analyzed. In lithofacies and paleogeography, the following results have been obtained: (1) the Middle Permian Qixia formation was deposited in a gentle slope background of high southwest and low north east, while the middle Permian Maokou formation superimposed a series of platform rifts distributed in the NW direction on this background. It has evolved into a paleogeographic pattern between Longwa and north east: (2) the transgression area of Qixia formation is an open platform environment, the high level area is a marginal platform, and the platform marginal beach of Jiango-Yaan area is a favorable reservoir facies zone; (3) the transgressive area of Maokou formation is carbonate shelf environment, and the high level area evolves into a rimmed platform, and the terrace marginal (reef) beach and the Taiwa marginal beach of Yanting-Guangan area are favorable reservoir facies zones. It is concluded that the two high-energy granular beach zones in Jiango-Yaan area and Yanting-Guang 'an area are favorable zones for the development of stratified dolomite reservoirs in the middle Permian of the basin and are the main direction of natural gas exploration in the next step.
【作者單位】： 中國(guó)石油杭州地質(zhì)研究院;中國(guó)石油天然氣集團(tuán)公司碳酸鹽巖儲(chǔ)層重點(diǎn)實(shí)驗(yàn)室;中國(guó)石油西南油氣田公司勘探開(kāi)發(fā)研究院;中國(guó)石油勘探開(kāi)發(fā)研究院;
【基金】：國(guó)家科技重大專(zhuān)項(xiàng)(編號(hào):2011ZX05004-002) 中國(guó)石油重大科技專(zhuān)項(xiàng)(編號(hào):2014E-32)
【分類(lèi)號(hào)】：P618.13

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