四川盆地栖霞组—茅口组岩相古地理与天然气有利勘探区带

发布时间：2018-11-15 13:37

【摘要】：中二叠统海相碳酸盐岩地层是四川盆地重要的天然气产层,勘探潜力巨大,但对其层状白云岩储层赋存相带及其分布情况等的认识尚不清楚,影响了天然气勘探的进程。为此,基于四川盆地沉积背景,以层序地层格架下有利储集层段为重点研究单元,通过对野外露头剖面、钻井资料和地震资料的综合分析,在岩相古地理方面取得以下研究成果:①中二叠统栖霞组沉积时总体表现为西南高、北东低的缓坡背景,而中二叠统茅口组在此背景上叠加了一系列北西向展布的台内裂陷,演变成向北东倾斜的隆洼相间的古地理格局:②栖霞组海侵域为开阔台地环境,高位域演化成镶边台地,剑阁一雅安地区的台地边缘滩为有利储集相带;③茅口组海侵域为碳酸盐岩陆棚环境,高位域演化为镶边台地,剑阁—雅安地区的台地边缘(礁)滩和盐亭—广安地区的台洼边缘滩为有利储集相带。结论认为:剑阁—雅安地区和盐亭—广安地区两条高能颗粒滩带是该盆地中二叠统层状白云岩储层规模发育的有利区带,是下一步天然气勘探的主攻方向。
[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.
【作者单位】：中国石油杭州地质研究院;中国石油天然气集团公司碳酸盐岩储层重点实验室;中国石油西南油气田公司勘探开发研究院;中国石油勘探开发研究院;
【基金】：国家科技重大专项(编号:2011ZX05004-002) 中国石油重大科技专项(编号:2014E-32)
【分类号】：P618.13

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