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

Abstract

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

CLC Number:

TE122.2

Li Qigui, Li Kesheng, Zhou Zhuozhu, Yan Jihong, Tang Huanyang. Palaeogeomorphology and karst distribution of Tongwan unconformity in Sichuan Basin[J]. Oil & Gas Geology, 2013, 34(4): 516-521.

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Palaeogeomorphology and karst distribution of Tongwan unconformity in Sichuan Basin

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