Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (2): 43-53.doi: 10.12108/yxyqc.20200205

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Characteristics of weathering crust karst reservoir of Deng 4 member in Moxi area,Sichuan Basin

YANG Fan1, LIU Lifeng1, RAN Qiquan1, KONG Jinping1, HUANG Suqi2, HUANG Changwu1   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    2. School of Energy Resources, China University of Geosciences(Beijiing), Beijing 100083, China
  • Received:2019-07-08 Revised:2019-08-25 Online:2020-03-21 Published:2020-01-19

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Abstract: In recent years,great breakthroughs have been made in oil and gas exploration of Deng 4 member in Moxi area,Sichuan Basin. In order to study the characteristics and distribution regularity of high-quality karst reservoirs in the upper sub-member of Deng 4 member in Moxi 22 well area,core analysis,physical property testing,seismic data interpretation,logging data analysis and prediction of favorable development area of karst reservoir were carried out. The results show that:(1)The lithology of karst reservoir is mainly algal dolomite, sand-clastic dolomite and crystalline dolomite,and the reservoir space is mainly dissolved pore,cave and fracture.(2)The dissolution of carbonate rock includes the contemporaneous dissolution of atmospheric fresh water, deep hydrothermal dissolution and organic acid dissolution in the burial period,and dissolution of atmospheric fresh water in the supergene period.(3)The supergene dissolution controls the distribution of high-quality reservoirs which are mostly developed near the vertical vadose zone and the upper part of horizontal phreatic zone. The distribution of high-quality reservoirs in plane is controlled by sedimentary facies belt and palaeogeomorphological characteristics,with mound-beach facies and karst dome being the best. The research results indicate the direction for the next exploration in Moxi area.

Key words: weathering crust, karst reservoir, high-quality reservoir, development characteristics, upper submember of Deng 4 member, Sichuan Basin

CLC Number: 

  • TE122.2
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