Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (1): 155-164.doi: 10.3969/j.issn.1673-8926.2018.01.016

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Estimating method of braided channel bar under sparse well net: a case from Su X block in Sulige Gas Field

CUI Lianke1, SHAN Jingfu2, LI Fuping3, CUI Lu1, CHONG Jian4   

  1. 1. No.1 Oil Production Plant, Henan Oilfield Company, Sinopec, Nanyang 473000, Henan, China;
    2. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan 430100, China;
    3. Sulige Gas Field Research Center, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    4. Research Institute of Exploration and Development, PetroChina Huabei Oilfield, Renqiu 062550, Hebei, China
  • Received:2017-10-25 Revised:2017-12-17 Online:2018-01-21 Published:2018-01-21

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Abstract: In the braided river sedimentary environment,braided channel bars are more important reservoir sand body for oil and gas accumulation. How to identify braided channel bars by drilling well data,and then combine in plate,moreover,predict the distribution of channel bars,is the foundation for correctly understanding braided river deposits. The fine geological study of fine subzone division and correlation and sedimentary microfacies distribution in Su X block of Sulige Gas Field is insufficient,and single well yield and ultimate recovery are low. Based on the data of logging,field outcrop and modern satellite images,combined with fine stratum classification,sand thickness center line connecting method,braided bar logging phase separation method,radar map of braided bar and braided bar prediction technology,were used to identify and characterize single channel and braided bar,compile the radar map of braided bar and predict the braided bar. The results show that the layer of 1-1 and 1-2 of the lower He 8 member both developed three channels. The braided bar is given a length to thickness ratio of 60:1-80:1,a width to thickness ratio of 30:1-40:1,and a length to width ratio of 2:1-3:1, while the length is 300-1 100 m and the width is 150-550 m. The single channel sand thickness is inversely proportional to the number of braided bar. The results of infill wells show that the radar map of braided bar and prediction technology both have high credibility. The above methods can improve the drilling ratio of braided bar, provide a better condition for the arrangement of infill wells and horizontal wells and improve oil and gas recovery efficiency,and provide reference for the study of sand body distribution and space superposition in the block with similar stratum structure and well density.

Key words: sedimentary facies, grain banks, Ordovician, Tarim Basin

CLC Number: 

  • TE121.3
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