Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (5): 70-80.doi: 10.12108/yxyqc.20210507

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Sedimentary characteristics of fluvial dominated shallow water delta front and its control on lithologic reservoir: A case study of Baxigai Formation in south slope of Kuqa Depression

LUO Haoyu1, CHEN Jun2, ZHANG Xueqi1, MENG Xiangxia2, ZHAO Fengquan1, WU Shaojun1, GUO Xuan2   

  1. 1. Research Institute of Exploration and Development, PetroChina Tarim Oilfield Company, Korla 841000, Xinjiang, China;
    2. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China
  • Received:2021-01-25 Revised:2021-03-18 Online:2021-10-01 Published:2021-09-30

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Abstract: Two lithologic reservoirs have been discovered in south slope of Kuqa Depression, which shows the great potential of Cretaceous lithologic reservoirs exploration in this area. To further expand the field of lithologic reservoir exploration in Cretaceous Baxigai Formation, based on core observation, well logging facies, seismic facies, ratio of the sand and formation and paleogeomorphology, it is confirmed that the provenance of member U, M and L are from south Halahatang and south Yingmaili. The sedimentary system is fluvial dominated shallow water delta. The member M and L of Baxigai Formation are distributed in the southeast Halahatang, and inner front shallow lacstrine subfacies of fluvial dominated shallow water delta are developed. The member U are distributed in the project, which is a retrograde depositional model, inner front-outer front-shallow lacstrine facies of fluvial dominated shallow water delta are developed. The structure of the project is dip northward, and the provenance comes from the south. The sheet sand at the top of the inner front, the underwater distributary channel on the flank of the outer front and the sheet sand at the tip of the outer front are the favorable facies for lithologic reservoir exploration. The south Yingmaili and well annulus of yd7-ym46-dh26 are prospects for Cretaceous lithologic reservoirs exploration in member U of Baxigai Formation. The results can provide a basis for further exploration of Cretaceous lithologic reservoirs in south slope of Kuqa Depression.

Key words: fluvial dominated shallow water delta, underwater distributary channel, Baxigai Formation, Cretaceous, lithologic reservoir, Kuqa Depression

CLC Number: 

  • TE121.3
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