Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (1): 97-111.doi: 10.3969/j.issn.1673-8926.2018.01.010

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Description and distribution characteristics of Lower Carboniferous karst reservoir of Asa block in Marsel area,southern Kazakhstan

ZHAO Bozhi1, LIN Changsong1,2, LI Hao2, WANG Yuan1, SUN Yanda3, HE Haiquan3, WANG Qinglong3   

  1. 1. School of Energy Resources, China University of Geosciences, Beijing 100083, China;
    2. School of Ocean Sciences, China University of Geosciences, Beijing 100083, China;
    3. Research Institute of Exploration and Development Technology, Geo-Jade Petroleum Corporation, Beijing 100016, China
  • Received:2017-08-19 Revised:2017-10-29 Online:2018-01-21 Published:2018-01-21

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Abstract: The Asa block located in Marsel exploration area at the north and middle of Kazakhstan has a good condition for natural gas deposits,and the Lower Carboniferous carbonate rocks have a rich gas display,which becomes a new breakthrough in recent exploration phase. As found in the related study,the favorable reservoir development is closely related with karstification. The imaging logging data,combined with cores,conventional logging curves and logging cross plots,were used to divide karst structural units for typical single wells in the study area. The results show that except Tournaisian(C1t),Karst developed in all the other layers of the Lower Carboniferous in Asa block,especially developed in Visean(C1v3)and Serpukhovian(C1sr). A fine description of the main karst section was conducted by using imaging logging and the result shows that karst in C1sr and in C1v3 has obvious different characteristics. Moreover,there are two sets of karsts developed in C1sr,and they are below the gypsum rocks which can indicate arid environment. Through horizontal well-tie section contrast,C1v3 has the features of epigenic karst and obvious vertical distribution and it can be divided into the weathering crust palaeosol,vertical vadose karst zone and horizontal underflow karst zone from the top to the bottom. The vertical vadose karst zone is dominated by high angle dissolved enlarged fractures,while horizontal underflow karst zone is dominated by low angle dissolved enlarged fractures and unfilled caverns. This study result is helpful for guiding fine description of carbonate karst reservoirs and searching for favorable carbonate karst reservoirs.

Key words: scale formation, prediction, saturation index method, stability index method, Huabei Oilfield

CLC Number: 

  • TE122.2
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