LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (5): 60-66.doi: 10.3969/j.issn.1673-8926.2015.05.010

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Lithofacies and reservoir characteristics of subaqueous fan: A case from Yan 227 blok in Yanjia Oilfield

Dong Yue1， Hou Jiagen1， Cao Gang2， Liu Yuming1， Wang Ziyuan3， Li Jing1   

  1. 1. Institute of Earth Science ， China University of Petroleum ， Beijing 102249 ， China ； 2. Research Institute of Exploration and Development, Shengli Oilfield Company ， Sinopec ， Dongying 257015 ， Shandong ， China ； 3. School of Earth and Space Science ， Peking University ， Beijing 100871 ， China
  • Online:2015-09-26 Published:2015-09-26

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Abstract:

A full understanding of the internal architecture and quality of subaqueous fan reservoir is significant for remaining oil tapping and development plan adjustment. Taking Yan 227 block in Yanjia Oilfield as an example, this paper summarized 6 types of core lithofacies based on core observation, and analyzed their sedimentary characteristics and origins. Because of the discrepancy of scale and resolution between core data and well log data or seismic data, in consideration of the necessity and possibility of quantitative classification of lithofacies by using well log data, the 6 types of core lithofacies were classified into 4 patterns, including mudstone facies, pebbly sandstone facies, gravel sandstone facies and conglomerate facies, and the classification criterion for each pattern was determined. And then, based on lab analysis data, the reservoir quality of each pattern was summarized: gravel sandstone facies mainly has residual pore between grains, the physical properties and oil-bearing character are the best, which makes it the first rank reservoir; pebbly sandstone facies has pores between grains and intragranular dissolved pores, the properties and oil-bearing character are medium and it is the second rank reservoir; conglomerate facies mainly has residual pores between grains but the physical properties and oil-bearing character are relative poor, so it is the third rank reservoir; the physical properties of mudstone facies is the worst, and it is nearly oil-free, so it is non-reservoir in the study area. On this basis, seismic inversion of acoustic impedance was applied to analyze the lithofacies distribution. The result shows that in vertical range, the conglomerate facies is well developed at the bottom of E2s4, which is the deposit of or between the main channel in inner fan; the sandstone facies （including pebbly sandstone facies and gravel sandstone facies） is well developed in the middle of E2s4, which is the complex deposit of multi-stage braided channel in middle fan; the mudstone facies is well developed at the top, and in all the formation shows normal cycle. In horizontal range, the conglomerate facies is ribbon-like and orients northeast-southwest, and the sandstone facies is sheet-like.

Key words:  lower Urho Formation, traction current sand-conglomerate, gravity current sand-conglomerate, Ma 2 well block, Mahu Depression

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