Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (2): 81-92.doi: 10.12108/yxyqc.20210209

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Characteristics and genetic mechanism of Mesozoic clastic reservoirs in Beidagang buried hill,Huanghua Depression

LI Zubing1, CUI Junfeng2, SONG Shunyao3, CHENG Yabin3, LU Yi3, CHEN Cen1   

  1. 1. Chongqing Key Laboratory of Complex Oil and Gas Field Exploration and Development, Chongqing University of Science and Technology, Chongqing 401331, China;
    2. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    3. Research Institute of Exploration and Development, PetroChina Dagang Oilfield Company, Tianjin 300280, China
  • Received:2020-05-10 Revised:2020-09-18 Online:2021-04-01 Published:2021-03-31

Abstract: The characteristics and genetic mechanism of Mesozoic clastic reservoirs in Beidagang buried hill, Huanghua Depression were systematically analyzed by combining the data of core,X-ray diffraction,casting thin section,scanning electron microscope and logging with the burial evolution history of the strata. The results show that:(1) There are many types of Mesozoic clastic rocks in the study area,but they are mainly feldspathic lithic sandstone,lithic quartz sandstone and lithic sandstone.(2) The Mesozoic clastic reservoirs in the study area are composed of primary pores,secondary dissolved pores and micro-fractures,dominated by secondary dissolved pores. The reservoir properties are characterized by low porosity and low to extra low permeability.(3) Reservoir development is influenced by sedimentary,diagenetic and tectonic processes. Compaction,cementation,dissolution and oil and gas charging in diagenetic process all have effects on reservoir development,among which dissolution has the greatest impact on the development of reservoir space. From the control degree of reservoir development,the sorting of rock particles is stronger than lithology,and compaction is stronger than cementation. The slope,unconformity surface and fault caused by tectonic action not only provide the place for the dissolution,but also provide channel for the flow of the dissolution fluid. The research results provide a geological basis for the optimization of favorable exploration target areas in Beidagang buried hill area of Huanghua Depression.

Key words: clastic rock, reservoir characteristics, reservoir genesis, Mesozoic, Beidagang buried hill, Huanghua Depression

CLC Number: 

  • TE122.2
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