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The origin and influence of the grain beach reservoirs of  Cambrian Longwangmiao Formation in Central Sichuan area,Sichuan Basin

Xie Wu-ren,Yang Wei,Li Xi-zhe,Wei Guo-qi,Ma Shi-yu,Wen Long,Guo Zhen-hua   

  1. 1.PetroChina Research Institute of Petroleum Exploration and Development,Langfang 065007,China;2.Research Institute of Exploration and Development,PetroChina Southwest Oil and Gas Field Company,Chengdu 610041,China
  • Received:2018-11-01 Revised:2018-11-24 Online:2018-12-10

Abstract: Based on thorough observation of the core of Longwangmiao Formation of 12 wells in Central Sichuan area and combined with seismic and drilling data,this paper studies the deposition environment,grain shoal reservoir characteristics and the sequence and combination of grain shoal of Longwangmiao Formation in Central Sichuan area,and analyzes the relationship of the widespread grain shoal reservoir and the high production of petroleum in this area.Longwangmiao Formation in the study area was deposited in gentle slope environment,and due to the formation of Gaoshiti-Moxisyn-depositional paleo-uplift in Central Sichuan before its deposition,the paleo-uplift controlled the large-area distribution of grain shoal in Longwangmiao Formation.Owing to overall regression and decline of the sea level,grain shoals formed in four stages vertically stacked within Longwangmiao Formation.Each grain shoal has a thickness of 10-20m and spreads laterally for 5-15km.Different grain shoals vertically superimposed,covering a large area.Grain shoals is composed of shoal body and shoal margin,and their distribution is controlled by minor landform change.The shoal bodies are separated and shoal margins are inter-connected.Grain shoals are mainly sand-grain dolostone,and it is reformed by dolomitization and epigenickarstification in later periods,forming high-quality reservoir with widespread karst pores,holes and cracks formed in multiple stages.Because of their great thickness,reservoirs in shoal margin have high production in single-well testing,and thus is the target of high petroleum production and rich petroleum accumulation.

Key words: Sichuan Basin, Gaoshiti-Moxi, Grain shoal, Shoal body, Dolostone reservoir

CLC Number: 

  • TE121.3
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