Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (3): 34-43.doi: 10.12108/yxyqc.20200304

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Diagenetic characteristics and quantitative porosity restoration of Chang 61 tight sandstone reservoir in Hujianshan area，Ordos Basin

WANG Jiwei1, ZHU Yushuang2, RAO Xinjiu1, ZHOU Shuxun3, WU Yingqiang3, YANG Hongmei4   

  1. 1. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    2. State Key Laboratory for Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China;
    3. Oilfield Development Division, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    4. No.2 Oil Production Plant, PetroChina Changqing Oilfield Company, Qingyang 745100, Gansu, China
  • Received:2019-11-13 Revised:2019-12-20 Online:2020-05-21 Published:2020-04-30

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Abstract: Based on the analysis of a large number of cores and casting thin slice,the diagenetic characteristics of Chang 61 reservoir in Hujianshan area of Ordos Basin and its influence on reservoir physical properties were systematically analyzed by means of SEM,cathodoluminescence and high-pressure mercury injection,and the pore evolution was quantitatively restored. The results show that the Chang 61 reservoir in Hujianshan area was in the middle diagenetic phase A,mainly underwent compaction-pressure dissolution,cementation and dissolution,resulting different influences on the pore development of the reservoir. The compaction destroyed a large number of primary intergranular pores,which was the most important factor for reservoir compaction in the study area. The average porosity decreased by 18.41%,and the loss rate of pore space reached 56.62%. The cementation not only blocked the pore space,but also enhanced the anti-compaction strength of particles to a certain extent. The porosity decreased by 10.38% on average,and the loss rate of pore space reached 19.78%. The dissolution dissolved unstable components such as clastic particles and interstitial materials,resulting in a large number of secondary pores,thereby improving the physical properties of the reservoir,and the increased porosity was 2.26% on average. According to the impact of the diagenesis on reservoir properties and logging response characteristics,six types of diagenetic facies were identified,namely chlorite film phase-residual intergranular pore facies,residual intergranular pore facies,feldspar dissolution facies,clay mineral cementation facies,carbonate cementation facies and compaction facies. Chlorite film phase-residual intergranular pore facies is the most favorable diagenetic facies for oil enrichment,followed by residual intergranular pore facies.

Key words: diagenesis, quantitative porosity restoration, favorable diagenetic facies, Chang 61 reservoir, Hujianshan area, Ordos Basin

CLC Number: 

  • TE121
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