Oil & Gas Geology ›› 2002, Vol. 23 ›› Issue (2): 196-202.doi: 10.11743/ogg20020222

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STUDY ON CARBONATE FRACTURE-CAVITY SYSTEM ——STATUS AND PROSPECTS

Chen Qinghua1,2, Liu Chiyang1, Wang Shuxiang3, Li Qin2, Wang Shaolan2, Xiao Hongping2, Zhang Fengqi2   

  1. 1. Department of Geology, Northwest university, Xi'an;
    2. Department of Petroleum Resource Science, Petroleum University, Dongying, Shandong;
    3. Dagang Oilfield(group) Company, CNPC, Tianjin
  • Received:2001-08-01 Online:2002-06-25 Published:2012-01-16

Abstract:

With well development of rift and karst,carbonate rock stratum might be a high quality of reservoir,Tahe No.4 oilfield is a typical example.The rift can be divided into various types on the basis of factors of its distribution pattern,occurrence,size,filling,connection and origin.stages division of the rift can be done according to various intersect relations of the rift,various filling compositions,filling stages,logging corresponding characteristics and different structural stress fields.Lithology,rock stratum thickness,fracture process,structural stress field,local structure,stratum load and karst process are all main controlling factors for the development of the rift.Palaeokarst process mainly consists of several types of sediment karst,weathered crust karst and karst of rift-cavity system etc.Paleaokarst had experienced periods of syndeposition,crust of weathering,burial and epigenetic variation in the course of evolution.Paleaokarst might be classified,paternally as karst trace,karst cave,karst pore and cave,vertically as surface karst belt,seepage flow karst belt and underflow karst belt.The development of paleaokast is controlled by several factors of climate,lithology,structure,hydrology and landform.The study of karst of rift-cavity system shall be divided into 3 stages:study karst of rift-cavity' occurrence,organizational system,development,origin,filling and distribution by observing outcrops and rock cores.Distinguish regularity of rifts and their distribution and development by studying and interpreting data collected from well drilling,logging,seism and rifts logging etc.predicate karst of rift-cavity by seism,logging and simulation of structural stress fields.The study of karst of rift-cavity system shall be based on improving and perfecting available technical methods,enforcing application of new technical methods,stressing the importance and orientation of comprehensive application of various methods by seeking more effective theories and technical methods.

Key words: carbonate rock, rift-cavity system, status, prospect

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