Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (1): 30-39.doi: 10.12108/yxyqc.20190104

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Sedimentary characteristics of shallow-water braided delta of Karamay Formation in Mahu area

YANG Fan1, CAO Zhenglin1, WEI Yanzhao1, LU Linlin1, WU Aicheng2, MA Liya1, WANG Ruiju1   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    2. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China
  • Received:2018-09-17 Revised:2018-11-24 Online:2019-01-18 Published:2019-01-18

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Abstract: Recently,several wells of Karamay Formation in Mahu area have obtained industrial oil and gas flow,which shows a favorable exploration potential of middle and shallow strata. In order to find out the characteristics of sedimentary system of Karamay Formation in Mahu area and to clarify the origin and distribution of main sand bodies,core observation,provenance analysis,sedimentary facies study,plane distribution rule and controlling factors of sand bodies were carried out. The results show that:(1)During the sedimentary period of Karamay Formation,Junggar Basin was a depression lacustrine basin,and Mahu area was gradually transformed from a "multi-uplift and multi-depression" to a "large gentle slope" background. Based on this structural background,four provenance systems were developed during the Karamay Formation. The sedimentary facies are mainly shallow braided river delta. The main reservoir types are underwater distributary channel sand bodies in the front of shallow braided river delta.(2)The sand bodies in the lower Karamay Formation are mainly concentrated at the bottom,interbedded with mudstone,and relatively developed in Xiazijie,Huangyangquan and other main provenance areas;(3)The sand bodies in the upper Karamay Formation are mainly developed at the top, and the delta sand bodies deposit in the form of imbrication toward the center of the lacustrine and extend far away. Reservoir-seal assemblage formed by sand bodies of lower Karamay Formation and thick dark mudstone of upper Karamay Formation and reservoir-seal assemblage formed by sand bodies at top of Karamay Formation and huge thick mudstone of Baijiantan Formation are favorable exploration zones. The research results have guiding significance for oil and gas exploration of Karamay Formation in Mahu area.

Key words: shallow-water braided delta, imbricated progradation, Karamay Formation, Triassic, Mahu area

CLC Number: 

  • TE121.3
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