Petroleum Exploration and Development >

2018 , Vol. 45 >Issue 2: 247 - 256

DOI: https://doi.org/10.11698/PED.2018.02.07

PETROLEUM EXPLORATION

Formation mechanisms of good-quality clastic reservoirs in deep formations in rifted basins: A case study of Raoyang sag in Bohai Bay Basin, East China

  • JIN Fengming ,
  • ZHANG Kaixun ,
  • WANG Quan ,
  • NIU Xinjie ,
  • YU Zuogang ,
  • BAI Guoping ,
  • ZHAO Xuan
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  • 1. PetroChina Dagang Company, Tianjin 300280, China;
    2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;
    3. College of Geosciences, China University of Petroleum, Beijing 102249, China;
    4. PetroChina Huabei Company, Renqiu 062552, China;
    5. CNPC Bohai Drilling Engineering Company Limited, Renqiu 062552, China

Received date: 2017-10-25

  Revised date: 2018-02-24

  Online published: 2018-03-22

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Abstract

In order to reveal the development mechanism of deep quality clastic rock reservoir, the basic characteristics of Sha-3 Member of the Shahejie Formation in the Raoyang sag of Bohai Bay Basin are analyzed based on observation of cores, observation of thin sections under microscope and SEM, and test results of petrophysical properties. It is found that high compositional and textural maturity, early oil charging, and dissolution are the main factors controlling the formation and preservation of pores in deep reservoirs. Compaction is the major factor destructing pores, whereas formation overpressure is conducive to the preservation of original pores, high compositional and medium textural maturity can enhance the resistance of the formation to compaction and protect primary pores. Early oil charging could lead to temporary cessation of diagenesis and thus inhibit the destructive impact of cementation on pores. When organic acids entered reservoir formations, considerable amounts of secondary pores were formed, leading to the improvement of petrophysical properties in local parts. When predicting good quality belt in exploration of deep formations, it is recommended that the superimposing effects of the multiple factors (overpressure; early oil charging; compositional and textural maturity; diagenesis) be taken into consideration.

Key words： Bohai Bay Basin; Raoyang sag; rifted basin; Shahejie Formation; diagenesis; high porosity zone; dissolution

Cite this article

JIN Fengming , ZHANG Kaixun , WANG Quan , NIU Xinjie , YU Zuogang , BAI Guoping , ZHAO Xuan . Formation mechanisms of good-quality clastic reservoirs in deep formations in rifted basins: A case study of Raoyang sag in Bohai Bay Basin, East China[J]. Petroleum Exploration and Development, 2018 , 45(2) : 247 -256 . DOI: 10.11698/PED.2018.02.07

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