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Volume 43 Issue 6
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2021  >  43(6): 1097-1106
GAO Mengtian, LU Yongchao, DU Xuebin, MA Yiquan, ZHANG Jingyu, DENG Kong. Multi-factor evaluation for fine grading of tight sandstone reservoirs: a case study from H3 sand group in the upper section of Oligocene Huagang Formation, Xihu Sag, East China Sea Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2021, 43(6): 1097-1106. doi: 10.11781/sysydz2021061097
Citation: GAO Mengtian, LU Yongchao, DU Xuebin, MA Yiquan, ZHANG Jingyu, DENG Kong. Multi-factor evaluation for fine grading of tight sandstone reservoirs: a case study from H3 sand group in the upper section of Oligocene Huagang Formation, Xihu Sag, East China Sea Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2021, 43(6): 1097-1106. doi: 10.11781/sysydz2021061097
shu

Multi-factor evaluation for fine grading of tight sandstone reservoirs: a case study from H3 sand group in the upper section of Oligocene Huagang Formation, Xihu Sag, East China Sea Basin

doi: 10.11781/sysydz2021061097
  • 1.

    Hainan Branch, CNOOC, Haikou, Hainan 570312, China

  • 2.

    Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China

  • 3.

    College of Marine Science and Technology, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China

  • 4.

    Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan 610059, China

  • Received Date: 2021-04-08
  • Rev Recd Date: 2021-08-20
  • Publish Date: 2021-11-28
    Abstract
  • The H3 sand group of the upper section of the Oligocene Huagang Formation in the western sub-sag of the Xihu Sag of the East China Sea Continental Shelf Basin is a tight sandstone reservoir with low porosity and low or ultra-low permeability. The distribution of high-quality reservoirs has become a key factor restricting productivity. Based on coring, well logging and physical property test data, the sedimentary microfacies and physical properties of the H3 sand group were studied, and a fine grading evaluation and "sweet spot" prediction were carried out. The reservoir distribution in the H3 sand group was mainly affected by four factors: structural characteristics, sedimentary microfacies, sand thickness and conditions of porosity and permeability. Moreover, on the basis of comprehensive analysis of the relationship among these factors and gas saturation, a four-factor reservoir fine grading evaluation method was proposed. The H3 sand group reservoirs were divided into three types: "sweet spot" reservoirs (type Ⅰ), medium reservoirs (type Ⅱ) and ineffective reservoirs (type Ⅲ).The H3-3 single sand layer has a great exploration potential, followed by the H3-1, H3-2 and H3-4 single sand layers.

     

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