四川盆地桐湾不整合面古地貌特征与岩溶分布预测

doi:10.11743/ogg20130413

摘要/Abstract

摘要： 四川盆地震旦系灯影组风化壳岩溶储层的分布主要受桐湾期不整合面古地貌的古高地、古斜坡的控制。利用全盆的地震格架大剖面解释资料和钻井资料,结合厚度印模法,恢复了桐湾不整合面古地貌,古地貌特征呈西北高、中部斜坡、东南洼的格局。综合利用野外、钻井、地震等资料,深入分析灯影组溶蚀孔洞发育特征和有利岩溶发育带。结果表明,岩溶风化壳溶蚀孔洞发育,广泛发育3个岩溶作用带,岩溶作用厚度呈东薄西厚的变化趋势;岩溶有利发育分布区和较发育分布区主要分布在古岩溶斜坡的地貌位置,以自贡—广安—达县—通江县一线为好,局部发育分布区位于古岩溶高地及古岩溶洼地的地貌位置,分布在成都-资阳地区、绵阳-广元地区及川东南一带。

关键词: 古地貌, 碳酸盐岩, 岩溶储层, 桐湾不整合, 四川盆地

Abstract: The distribution of weathering crust karst reservoirs of the Sinian Dengying Formation in Sichuan Basin is mainly controlled by palaeo-highlands and palaeo-slopes of unconformity produced by the Tongwan Movement.Based on the interpretation of the cross-basin seismic profile and drilling data,this paper restored the palaeogeomorphology of Tongwan unconformity by using printing method.The palaeogeomorphology features in a framework consisting of the northwes-tern high,central slope and southeastern sag.Outcrop,drilling and seismic data were integrated to study the development characteristics of the solution cavities and pores and predict favorable karst reservoirs in the Dengying Formation.It is concluded that solution cavities and pores are well developed in the karst weathering crust with three widely distributed karst belts.The karst is thick in the west and thin in the west.The favorable and fair karst belts occur on the palaeo-karst slopes,such as Zigong-Guangan-Daxian-Tongjiang.And the local karst belts occur on the palaeo-karst high and in the palaeo-karst sag,such as Chengdu-Ziyang,Mingyang-Guangyuan as well as the south-eastern part of Sichuan Basin.

Key words: palaeogeomorphology, carbonate rock, karst reservoir, Tongwan unconformity, Sichuan Basin

中图分类号:

TE122.2

李启桂,李克胜,周卓铸,等. 四川盆地桐湾不整合面古地貌特征与岩溶分布预测[J]. 石油与天然气地质, 2013, 34(4): 516-521. doi: 10.11743/ogg20130413 Li Qigui,Li Kesheng,Zhou Zhuozhu,et al. Palaeogeomorphology and karst distribution of Tongwan unconformity in Sichuan Basin[J]. Oil & Gas Geology, 2013, 34(4): 516-521. doi: 10.11743/ogg20130413

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