摘要
四川盆地普光气田在近期获得重大突破,普光气田礁滩复合型气藏物质聚集模式及储层特征的深入研究对于川东北地区乃至整个四川盆地的碳酸盐岩有利勘探区的预测具有一定的指导意义。受开江—梁平台盆(inter-platform basin)的控制,普光地区长兴组—飞仙关组在台盆东侧发育了类似于威尔逊相模式的碳酸盐岩沉积体系,主要发育台地蒸发岩、局限台地、开阔台地、台地边缘礁滩、斜坡和台盆沉积相,但陆棚相不甚发育。古地理的分异主要围绕开江—梁平台盆的发育、发展及填平补齐的过程而演化。储层沉积微相及微观地质特征研究表明,台地边缘礁滩相为该区储层发育最有利的相带,海绵障积白云岩、海绵骨架礁灰岩、鲕粒白云岩及残余鲕粒白云岩等为最主要的储集岩类型。优质储层的发育主要受沉积相带展布,后期的白云石化、溶蚀作用以及构造作用的控制。
The Puguang gas field is the biggest and deepest gas field recently found in the Sichuan basin, southwestern China. Recendy a major breakthrough has been made in this gas field. The intensive study of the model of accumulation of materials in the shoal-reef compound gas deposit of the field has certain guiding significance for the prediction of favorable exploration areas of carbonate rocks in northeastern Sichuan and even the whole Sichuan basin. Controlled by the Kaijiang-Liangping inter-platform basin, a carbonate sedimentary system similar to Wilson's facies model is developed in the Changxing Formation and Feixianguan Formation in the Puguang area at the east side of the inter-platform basin, where there mainly occur platform evaporates, restricted platform, open platform, platform-margin reef-shoal, slopes and inter-platform basin sedimentary facies, but continental shelf facies is not well developed. The paleogeographic differentiation mainly evolved centering around the development and filling of the Kaijiang-Liangping inter-platform basin. The study of the sedimentary microfacies and microscopic geological characteristics of the reservoirs indicates that the platform-margin shoal reef facies is the most favorable facies belt for the development of reservoirs in the area and that sponge baffle dolomite, sponge skeletal reef limestone, oolitic dolomites and relic oolitic dolomite are main reservoir rock types. The development of favorable reservoirs are mainly controlled by the distribution of the sedimentary facies belt and later dolomitization, dissolution and tectonic processes
出处
《中国地质》
CAS
CSCD
2007年第6期1045-1054,共10页
Geology in China
基金
"十五"国家重大科技攻关项目(2004BA616A-06-02)资助。
关键词
普光气田
礁滩
储层
长兴组
飞仙关组
台盆
川东北
Puguang gas field
reef shoal
reservoir
Changxing Formation
Feixianguan Formation
inter-platform basin
northeastern Sichuan