LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (1): 95-101.doi: 10.3969/j.issn.1673-8926.2015.01.014

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Sedimentary features of the Lower Cambrian Longwangmiao Formation in the central Sichuan Basin

YANG Xuefei 1,2,3,WANG Xingzhi 1,2,3,DAI Lincheng 1,2,3,YANG Yueming 4,XIE Jirong 4,LUO Wenjun 4   

  1.  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation ， Southwest Petroleum University ， Chengdu 610500 ， China ；2. Key Laboratory of Natural Gas Geology in Sichuan Province ， Chengdu 610500 ， China ； 3. School of Geoscience and Technology ， Southwest Petroleum University ， Chengdu 610500 ， China ； 4. Research Institute of Exploration and Development ， PetroChina Southwest Oil and Gas Field Company ， Chengdu 610051 ， China
  • Online:2015-02-03 Published:2015-02-03

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Abstract:

 

Combining with geological background of Sichuan Basin, this paper studied the sedimentary features of Longwangmiao Formation in the central Sichuan Basin by means of cores, thin section observations and logging analysis. It indicates that the study area was located in restricted-evaporated platform during Longwangmiao period, which includes lagoon, intra-platform shoal, platform flat and tidal flat. During the Longwangmiao period, two episodes of transgression and regression process had occurred, and two sets of lagoon-intra-platform shoal-platform flat-tidal flat sediments developed upward. Lagoon developed in the bottom of Longwangmiao Formation, with deep and low fluid energy. Intraplatform shoal developed in the middle part of Longwangmiao Formation, and it was composed of thick dolarenite and oolitic dolostone with steady distribution in the study area. The fine crystalline dolostone generated in the platform flat with shallow and low energy, where was easy to be exposed to the surface and dissolved by meteoric fresh water. Tidal flat only developed in the top of Longwangmiao Formation, and often formed in the end of the regression. Affected by Leshan-Longnvsi paleouplift under the water, the study area was mainly located in intra-platform shoal with high energy.

Key words: clay minerals, oil and gas generation , catalysis, overview

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