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Method for Restoring the Initial Porosity of Bioclastic Mixed Rocks with Body Cavities: A case study of mixed rock reservoirs in the Es12 Formation around Bozhong Sag, Bohai Bay Basin
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XiYu QU1, Zhen YAN1, QingBin WANG2, ChangSheng MIAO3, YaWen DU1, WenBo WU4
Acta Sedimentologica Sinica | 2026, 44(1) : 155 - 165
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Acta Sedimentologica Sinica | 2026, 44(1): 155-165
Method for Restoring the Initial Porosity of Bioclastic Mixed Rocks with Body Cavities: A case study of mixed rock reservoirs in the Es12 Formation around Bozhong Sag, Bohai Bay Basin
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XiYu QU1, Zhen YAN1, QingBin WANG2, ChangSheng MIAO3, YaWen DU1, WenBo WU4
Affiliations
  • 1.School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong 266580, China
  • 2.CNOOC Tianjin Branch, Tianjin 300459, China
  • 3.School of Prospecting and Surveying Engineering, Changchun Institute of Technology, Changchun 130021, China
  • 4.CNPC Bohai Drilling Engineering Company Limited, Tianjin 300280, China
Published: 2026-02-10 doi: 10.14027/j.issn.1000-0550.2024.005
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Objective The Paleogene Shahejie Formation around the Bozhong Sag， Bohai Bay Basin， contains mixed-rock reservoirs with abundant oil and gas resources. The unique biomass cavity pores （lumens） in mixed-rock reservoirs are such that their initial porosity cannot be obtained by conventional formulas. No methods are known in China or elsewhere for recovering the initial porosity for mixed rocks， although accurate recovery is a key element in determining the evolution of the reservoir. Methods Experimental and numerical methods were used to determine the volume of the body cavity in modern snail samples. A physical simulation experiment was then conducted to simulate the cavity infill conditions in an actual depositional environment. Finally， a formula for calculating the initial porosity of mixed-rock reservoirs was derived based on commonly used formulas. Results Studies have shown that differences in the snail species have the greatest effect on the percentage of body cavity pore volume （i.e.， body cavity porosity）. Within the same species， the main reason for the difference in body cavity porosity is the size of the body cavity. For example， the mixed-rock sample from well QHD36-3-A at a depth of 3 765.03 m， with a high content of fragmented bioclasts， has an initial porosity of 51.68%. Conclusions A new calculation method for finding the initial porosity of mixed rocks is proposed based on previous formulas combined with physical simulation experiments. This is highly significant in the study of mixed-rock reservoir evolution.

mixed rock  /  gastropoda  /  initial porosity  /  porosity evolution  /  body cavity pore
XiYu QU, Zhen YAN, QingBin WANG, ChangSheng MIAO, YaWen DU, WenBo WU. Method for Restoring the Initial Porosity of Bioclastic Mixed Rocks with Body Cavities: A case study of mixed rock reservoirs in the Es12 Formation around Bozhong Sag, Bohai Bay Basin[J]. Acta Sedimentologica Sinica, 2026 , 44 (1) : 155 -165 . DOI: 10.14027/j.issn.1000-0550.2024.005
Funding
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  • National Natural Science Foundation of China(41372133)
  • Natural Science Foundation of Shandong Province(ZR2024MD078)
Appendix
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Year 2026 volume 44 Issue 1
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Article Info
doi: 10.14027/j.issn.1000-0550.2024.005
  • Receive Date：2023-11-23
  • Online Date：2026-09-17
  • Published：2026-02-10
Article Data
Affiliations
History
  • Received：2023-11-23
  • Revised：2024-01-09
  • Accepted：2024-03-02
Funding
National Natural Science Foundation of China(41372133)
Natural Science Foundation of Shandong Province(ZR2024MD078)
Affiliations
    1.School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong 266580, China
    2.CNOOC Tianjin Branch, Tianjin 300459, China
    3.School of Prospecting and Surveying Engineering, Changchun Institute of Technology, Changchun 130021, China
    4.CNPC Bohai Drilling Engineering Company Limited, Tianjin 300280, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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