New advance and enlightenment of eogenetic karstification
Tan Xiucheng1,2,3, Xiao Di1,2, Chen Jingshan2, Li Ling2,3, Liu Hong2,3
1 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,Sichuan
2 Sichuan Province Key Laboratory of Natural Gas Geology,Southwest Petroleum University,Chengdu 610500,Sichuan
3 Branch of Deposition and Accumulation,PetroChina Key Laboratory of Carbonate Reservoir, Southwest Petroleum University,Chengdu 610500,Sichuan
Based on the discovery of the karst differentiations of several carbonate layers with different lithofacies in Sichuan Basin,present research advance of eogenetic karstification abroad is collected and collated in this paper.(1)The karst host rocks can be divided into two types,namely eogenetic rock with high porosity-permeability and telogenetic rock with low porosity-permeability or with even totally compacted. The two type rocks mainly use the intergranular pores and the fracture for karst water transferring,respectively,and accordingly the so-called unconfined conduit and confined conduit develop. The whole process dominates the karst morphology of carbonate rocks during different diagenetic periods. It can be concluded that the porosity and permeability of carbonate rocks in different diagenetic periods control the development model of karst fissure and cave.(2)More attention should be given to the impact on the karstification by the geographical settings. The karstification type can be divided into island- and coastal-typed and continental typed. The former is mainly related to chemical dissolution associated with meteoroic lens,developing flank margin caves which can be regarded as identification marks for island- and coastal-typed karst,but with minor influence on the whole. The latter,on the contrast,mechanically interacts with underground and surface water,with mass underground river deposition and large influence on the range and depth.(3)We follow with interest of the related latest achievements for eogenetic karst investigation,such as the macro- and micro-characteristics,identification marks,and dissolution mechanism of eogenetic karstification,which poorly reported domestically. Finally,for multiple carbonate layers found in Paleozoic are pervasively featured by likely eogenetic karst in Sichuan Basin,it analyzes and concludes the development and distribution characteristics of eogenetic karst reservoir. The results may offer reference for the discovery,recognition for the similar karst,and also the exploration of related reservoir in future.
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